From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics: - added zpos properties to plane and plane state structures - added helpers for normalizing zpos properties of given set of planes - well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com --- Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl index 9dd48f7..0df6abb 100644 --- a/Documentation/DocBook/gpu.tmpl +++ b/Documentation/DocBook/gpu.tmpl @@ -2151,6 +2151,16 @@ void intel_crt_init(struct drm_device *dev) the underlying hardware).</td> </tr> <tr> + <td valign="top" > "zpos" </td> + <td valign="top" >RANGE</td> + <td valign="top" >Min= driver dependent, Max= driver dependent</td> + <td valign="top" >Plane</td> + <td valign="top" >Plane's 'z' position during blending operation (0 for background, highest for frontmost). + If two planes assigned to same CRTC have equal zpos values, the plane with higher plane + id is treated as closer to front. Can be IMMUTABLE if driver doesn't support changing + planes' order. Exact value range is driver dependent.</td> + </tr> + <tr> <td rowspan="20" valign="top" >i915</td> <td rowspan="2" valign="top" >Generic</td> <td valign="top" >"Broadcast RGB"</td> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 2bd3e5a..df88253 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -2,7 +2,7 @@ # Makefile for the drm device driver. This driver provides support for the # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
-drm-y := drm_auth.o drm_bufs.o drm_cache.o \ +drm-y := drm_auth.o drm_bufs.o drm_blend.o drm_cache.o \ drm_context.o drm_dma.o \ drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \ drm_lock.o drm_memory.o drm_drv.o drm_vm.o \ diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 86e89db..bd457ca 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -700,6 +700,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane, state->src_h = val; } else if (property == config->rotation_property) { state->rotation = val; + } else if (property == plane->zpos_property) { + state->zpos = val; } else if (plane->funcs->atomic_set_property) { return plane->funcs->atomic_set_property(plane, state, property, val); @@ -756,6 +758,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane, *val = state->src_h; } else if (property == config->rotation_property) { *val = state->rotation; + } else if (property == plane->zpos_property) { + *val = state->zpos; } else if (plane->funcs->atomic_get_property) { return plane->funcs->atomic_get_property(plane, state, property, val); } else { diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 997fd21..f10652f 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -32,6 +32,8 @@ #include <drm/drm_atomic_helper.h> #include <linux/fence.h>
+#include "drm_crtc_internal.h" + /** * DOC: overview * @@ -587,6 +589,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev, struct drm_plane_state *plane_state; int i, ret = 0;
+ ret = drm_atomic_helper_normalize_zpos(dev, state); + if (ret) + return ret; + for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs;
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@ +/* + * Copyright (C) 2016 Samsung Electronics Co.Ltd + * Authors: + * Marek Szyprowski m.szyprowski@samsung.com + * + * DRM core plane blending related functions + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ +#include <drm/drmP.h> +#include <drm/drm_atomic.h> +#include <drm/drm_crtc.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/sort.h> + +#include "drm_internal.h" + +/** + * drm_plane_create_zpos_property - create mutable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic mutable zpos property and enables support + * for it in drm core. Drivers can then attach this property to planes to enable + * support for configurable planes arrangement during blending operation. + * Once mutable zpos property has been enabled, the DRM core will automatically + * calculate drm_plane_state->normalized_zpos values. Usually min should be set + * to 0 and max to maximal number of planes for given crtc - 1. + * + * If zpos of some planes cannot be changed (like fixed background or + * cursor/topmost planes), driver should adjust min/max values and assign those + * planes immutable zpos property with lower or higher values (for more + * information, see drm_mode_create_zpos_immutable_property() function). In such + * case driver should also assign proper initial zpos values for all planes in + * its plane_reset() callback, so the planes will be always sorted properly. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_property); + +/** + * drm_plane_create_zpos_immutable_property - create immuttable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic immutable zpos property and enables + * support for it in drm core. Using this property driver lets userspace + * to get the arrangement of the planes for blending operation and notifies + * it that the hardware (or driver) doesn't support changing of the planes' + * order. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, + "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); + +static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{ + const struct drm_plane_state *sa = *(struct drm_plane_state **)a; + const struct drm_plane_state *sb = *(struct drm_plane_state **)b; + + if (sa->zpos != sb->zpos) + return sa->zpos - sb->zpos; + else + return sa->plane->base.id - sb->plane->base.id; +} + +/** + * drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values + * @crtc: crtc with planes, which have to be considered for normalization + * @crtc_state: new atomic state to apply + * + * This function checks new states of all planes assigned to given crtc and + * calculates normalized zpos value for them. Planes are compared first by their + * zpos values, then by plane id (if zpos equals). Plane with lowest zpos value + * is at the bottom. The plane_state->normalized_zpos is then filled with unique + * values from 0 to number of active planes in crtc minus one. + * + * RETURNS + * Zero for success or -errno + */ +int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, + struct drm_crtc_state *crtc_state) +{ + struct drm_atomic_state *state = crtc_state->state; + struct drm_device *dev = crtc->dev; + int total_planes = dev->mode_config.num_total_plane; + struct drm_plane_state **states; + struct drm_plane *plane; + int i, zpos, n = 0; + int ret = 0; + + DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", + crtc->base.id, crtc->name); + + states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL); + if (!states) + return -ENOMEM; + + /* + * Normalization process might create new states for planes which + * normalized_zpos has to be recalculated. + */ + drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { + struct drm_plane_state *plane_state = + drm_atomic_get_plane_state(state, plane); + if (IS_ERR(plane_state)) { + ret = PTR_ERR(plane_state); + goto done; + } + states[n++] = plane_state; + DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n", + plane->base.id, plane->name, + plane_state->zpos); + } + + sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); + + for (i = 0, zpos = 0; i < n; i++, zpos++) { + plane = states[i]->plane; + + zpos = max_t(int, zpos, states[i]->zpos); + + states[i]->normalized_zpos = zpos; + DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n", + plane->base.id, plane->name, zpos); + } + crtc_state->zpos_changed = true; + +done: + kfree(states); + return ret; +} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos); + +/** + * drm_atomic_helper_normalize_zpos - calculate normalized zpos values for all + * crtcs + * @dev: DRM device + * @state: atomic state of DRM device + * + * This function calculates normalized zpos value for all modified planes in + * the provided atomic state of DRM device. For more information, see + * drm_atomic_helper_crtc_normalize_zpos() function. + * + * RETURNS + * Zero for success or -errno + */ +int drm_atomic_helper_normalize_zpos(struct drm_device *dev, + struct drm_atomic_state *state) +{ + struct drm_crtc *crtc; + struct drm_crtc_state *crtc_state; + struct drm_plane *plane; + struct drm_plane_state *plane_state; + int i, ret = 0; + + for_each_plane_in_state(state, plane, plane_state, i) { + crtc = plane_state->crtc; + if (!crtc) + continue; + if (plane->state->zpos != plane_state->zpos) { + crtc_state = + drm_atomic_get_existing_crtc_state(state, crtc); + crtc_state->zpos_changed = true; + } + } + + for_each_crtc_in_state(state, crtc, crtc_state, i) { + if (crtc_state->plane_mask != crtc->state->plane_mask || + crtc_state->zpos_changed) { + ret = drm_atomic_helper_crtc_normalize_zpos(crtc, + crtc_state); + if (ret) + return ret; + } + } + return 0; +} +EXPORT_SYMBOL(drm_atomic_helper_normalize_zpos); diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index a78c138..37d9068 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -42,3 +42,6 @@ int drm_atomic_get_property(struct drm_mode_object *obj, int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv);
+/* drm_blend.c */ +int drm_atomic_helper_normalize_zpos(struct drm_device *dev, + struct drm_atomic_state *state); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index d1559cd..921c93f 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -305,6 +305,7 @@ struct drm_plane_helper_funcs; * @mode_changed: crtc_state->mode or crtc_state->enable has been changed * @active_changed: crtc_state->active has been toggled. * @connectors_changed: connectors to this crtc have been updated + * @zpos_changed: zpos values of planes on this crtc have been updated * @color_mgmt_changed: color management properties have changed (degamma or * gamma LUT or CSC matrix) * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes @@ -340,6 +341,7 @@ struct drm_crtc_state { bool mode_changed : 1; bool active_changed : 1; bool connectors_changed : 1; + bool zpos_changed : 1; bool color_mgmt_changed : 1;
/* attached planes bitmask: @@ -1263,6 +1265,9 @@ struct drm_connector { * plane (in 16.16) * @src_w: width of visible portion of plane (in 16.16) * @src_h: height of visible portion of plane (in 16.16) + * @zpos: priority of the given plane on crtc (optional) + * @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1 + * for given crtc * @state: backpointer to global drm_atomic_state */ struct drm_plane_state { @@ -1283,6 +1288,10 @@ struct drm_plane_state { /* Plane rotation */ unsigned int rotation;
+ /* Plane zpos */ + unsigned int zpos; + unsigned int normalized_zpos; + struct drm_atomic_state *state; };
@@ -1516,6 +1525,7 @@ enum drm_plane_type { * @properties: property tracking for this plane * @type: type of plane (overlay, primary, cursor) * @state: current atomic state for this plane + * @zpos_property: zpos property for this plane */ struct drm_plane { struct drm_device *dev; @@ -1546,6 +1556,8 @@ struct drm_plane { const struct drm_plane_helper_funcs *helper_private;
struct drm_plane_state *state; + + struct drm_property *zpos_property; };
/** @@ -2554,6 +2566,22 @@ extern struct drm_property *drm_mode_create_rotation_property(struct drm_device extern unsigned int drm_rotation_simplify(unsigned int rotation, unsigned int supported_rotations);
+int drm_plane_atomic_set_zpos_property(struct drm_plane *plane, + struct drm_plane_state *state, + struct drm_property *property, + uint64_t val); + +int drm_plane_atomic_get_zpos_property(struct drm_plane *plane, + const struct drm_plane_state *state, + struct drm_property *property, + uint64_t *val); + +int drm_plane_create_zpos_property(struct drm_plane *plane, + unsigned int min, unsigned int max); +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, + unsigned int min, + unsigned int max); + /* Helpers */
static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
remove private zpos property and use instead the generic new. zpos range is now fixed per plane type and normalized before being using in mixer.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com --- drivers/gpu/drm/sti/sti_mixer.c | 9 ++--- drivers/gpu/drm/sti/sti_plane.c | 80 +++++++++++++++-------------------------- drivers/gpu/drm/sti/sti_plane.h | 2 -- 3 files changed, 31 insertions(+), 60 deletions(-)
diff --git a/drivers/gpu/drm/sti/sti_mixer.c b/drivers/gpu/drm/sti/sti_mixer.c index e7425c3..d93f537 100644 --- a/drivers/gpu/drm/sti/sti_mixer.c +++ b/drivers/gpu/drm/sti/sti_mixer.c @@ -245,13 +245,10 @@ static void sti_mixer_set_background_area(struct sti_mixer *mixer,
int sti_mixer_set_plane_depth(struct sti_mixer *mixer, struct sti_plane *plane) { - int plane_id, depth = plane->zorder; + int plane_id, depth = plane->drm_plane.state->normalized_zpos; unsigned int i; u32 mask, val;
- if ((depth < 1) || (depth > GAM_MIXER_NB_DEPTH_LEVEL)) - return 1; - switch (plane->desc) { case STI_GDP_0: plane_id = GAM_DEPTH_GDP0_ID; @@ -284,8 +281,8 @@ int sti_mixer_set_plane_depth(struct sti_mixer *mixer, struct sti_plane *plane) break; }
- mask |= GAM_DEPTH_MASK_ID << (3 * (depth - 1)); - plane_id = plane_id << (3 * (depth - 1)); + mask |= GAM_DEPTH_MASK_ID << (3 * depth); + plane_id = plane_id << (3 * depth);
DRM_DEBUG_DRIVER("%s %s depth=%d\n", sti_mixer_to_str(mixer), sti_plane_to_str(plane), depth); diff --git a/drivers/gpu/drm/sti/sti_plane.c b/drivers/gpu/drm/sti/sti_plane.c index f10c98d..0e447d9 100644 --- a/drivers/gpu/drm/sti/sti_plane.c +++ b/drivers/gpu/drm/sti/sti_plane.c @@ -14,15 +14,6 @@ #include "sti_drv.h" #include "sti_plane.h"
-/* (Background) < GDP0 < GDP1 < HQVDP0 < GDP2 < GDP3 < (ForeGround) */ -enum sti_plane_desc sti_plane_default_zorder[] = { - STI_GDP_0, - STI_GDP_1, - STI_HQVDP_0, - STI_GDP_2, - STI_GDP_3, -}; - const char *sti_plane_to_str(struct sti_plane *plane) { switch (plane->desc) { @@ -114,69 +105,54 @@ static void sti_plane_destroy(struct drm_plane *drm_plane) drm_plane_cleanup(drm_plane); }
-static int sti_plane_set_property(struct drm_plane *drm_plane, - struct drm_property *property, - uint64_t val) +static int sti_plane_get_default_zpos(enum drm_plane_type type) { - struct drm_device *dev = drm_plane->dev; - struct sti_private *private = dev->dev_private; - struct sti_plane *plane = to_sti_plane(drm_plane); - - DRM_DEBUG_DRIVER("\n"); - - if (property == private->plane_zorder_property) { - plane->zorder = val; + switch (type) { + case DRM_PLANE_TYPE_PRIMARY: return 0; + case DRM_PLANE_TYPE_OVERLAY: + return 1; + case DRM_PLANE_TYPE_CURSOR: + return 7; } + return 0; +}
- return -EINVAL; +static void sti_plane_reset(struct drm_plane *plane) +{ + drm_atomic_helper_plane_reset(plane); + plane->state->zpos = sti_plane_get_default_zpos(plane->type); }
-static void sti_plane_attach_zorder_property(struct drm_plane *drm_plane) +static void sti_plane_attach_zorder_property(struct drm_plane *drm_plane, + enum drm_plane_type type) { - struct drm_device *dev = drm_plane->dev; - struct sti_private *private = dev->dev_private; - struct sti_plane *plane = to_sti_plane(drm_plane); - struct drm_property *prop; - - prop = private->plane_zorder_property; - if (!prop) { - prop = drm_property_create_range(dev, 0, "zpos", 1, - GAM_MIXER_NB_DEPTH_LEVEL); - if (!prop) - return; - - private->plane_zorder_property = prop; + switch (type) { + case DRM_PLANE_TYPE_PRIMARY: + case DRM_PLANE_TYPE_OVERLAY: + drm_plane_create_zpos_property(drm_plane, 0, 6); + break; + case DRM_PLANE_TYPE_CURSOR: + drm_plane_create_zpos_immutable_property(drm_plane, 7, 7); + break; } - - drm_object_attach_property(&drm_plane->base, prop, plane->zorder); }
void sti_plane_init_property(struct sti_plane *plane, enum drm_plane_type type) { - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(sti_plane_default_zorder); i++) - if (sti_plane_default_zorder[i] == plane->desc) - break; - - plane->zorder = i + 1; - - if (type == DRM_PLANE_TYPE_OVERLAY) - sti_plane_attach_zorder_property(&plane->drm_plane); + sti_plane_attach_zorder_property(&plane->drm_plane, type);
- DRM_DEBUG_DRIVER("drm plane:%d mapped to %s with zorder:%d\n", - plane->drm_plane.base.id, - sti_plane_to_str(plane), plane->zorder); + DRM_DEBUG_DRIVER("drm plane:%d mapped to %s\n", + plane->drm_plane.base.id, sti_plane_to_str(plane)); }
struct drm_plane_funcs sti_plane_helpers_funcs = { .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, .destroy = sti_plane_destroy, - .set_property = sti_plane_set_property, - .reset = drm_atomic_helper_plane_reset, + .set_property = drm_atomic_helper_plane_set_property, + .reset = sti_plane_reset, .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, }; diff --git a/drivers/gpu/drm/sti/sti_plane.h b/drivers/gpu/drm/sti/sti_plane.h index c50a3b9..2747773 100644 --- a/drivers/gpu/drm/sti/sti_plane.h +++ b/drivers/gpu/drm/sti/sti_plane.h @@ -68,14 +68,12 @@ struct sti_fps_info { * @plane: drm plane it is bound to (if any) * @desc: plane type & id * @status: to know the status of the plane - * @zorder: plane z-order * @fps_info: frame per second info */ struct sti_plane { struct drm_plane drm_plane; enum sti_plane_desc desc; enum sti_plane_status status; - int zorder; struct sti_fps_info fps_info; };
From: Marek Szyprowski m.szyprowski@samsung.com
This patch replaces zpos property handling custom code in Exynos DRM driver with calls to generic DRM code.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com --- drivers/gpu/drm/exynos/exynos_drm_drv.h | 2 - drivers/gpu/drm/exynos/exynos_drm_plane.c | 67 +++++-------------------------- drivers/gpu/drm/exynos/exynos_mixer.c | 6 ++- 3 files changed, 13 insertions(+), 62 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index cc33ec9..b34a7b9 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -64,7 +64,6 @@ struct exynos_drm_plane_state { struct exynos_drm_rect src; unsigned int h_ratio; unsigned int v_ratio; - unsigned int zpos; };
static inline struct exynos_drm_plane_state * @@ -221,7 +220,6 @@ struct exynos_drm_private { * this array is used to be aware of which crtc did it request vblank. */ struct drm_crtc *crtc[MAX_CRTC]; - struct drm_property *plane_zpos_property;
struct device *dma_dev; unsigned long da_start; diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c index 50185ac..bbaf6d3 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c @@ -139,9 +139,9 @@ static void exynos_drm_plane_reset(struct drm_plane *plane)
exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL); if (exynos_state) { - exynos_state->zpos = exynos_plane->config->zpos; plane->state = &exynos_state->base; plane->state->plane = plane; + plane->state->zpos = exynos_plane->config->zpos; } }
@@ -157,7 +157,6 @@ exynos_drm_plane_duplicate_state(struct drm_plane *plane) return NULL;
__drm_atomic_helper_plane_duplicate_state(plane, ©->base); - copy->zpos = exynos_state->zpos; return ©->base; }
@@ -170,43 +169,6 @@ static void exynos_drm_plane_destroy_state(struct drm_plane *plane, kfree(old_exynos_state); }
-static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane, - struct drm_plane_state *state, - struct drm_property *property, - uint64_t val) -{ - struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane); - struct exynos_drm_plane_state *exynos_state = - to_exynos_plane_state(state); - struct exynos_drm_private *dev_priv = plane->dev->dev_private; - const struct exynos_drm_plane_config *config = exynos_plane->config; - - if (property == dev_priv->plane_zpos_property && - (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS)) - exynos_state->zpos = val; - else - return -EINVAL; - - return 0; -} - -static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane, - const struct drm_plane_state *state, - struct drm_property *property, - uint64_t *val) -{ - const struct exynos_drm_plane_state *exynos_state = - container_of(state, const struct exynos_drm_plane_state, base); - struct exynos_drm_private *dev_priv = plane->dev->dev_private; - - if (property == dev_priv->plane_zpos_property) - *val = exynos_state->zpos; - else - return -EINVAL; - - return 0; -} - static struct drm_plane_funcs exynos_plane_funcs = { .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, @@ -215,8 +177,6 @@ static struct drm_plane_funcs exynos_plane_funcs = { .reset = exynos_drm_plane_reset, .atomic_duplicate_state = exynos_drm_plane_duplicate_state, .atomic_destroy_state = exynos_drm_plane_destroy_state, - .atomic_set_property = exynos_drm_plane_atomic_set_property, - .atomic_get_property = exynos_drm_plane_atomic_get_property, };
static int @@ -304,23 +264,13 @@ static const struct drm_plane_helper_funcs plane_helper_funcs = { };
static void exynos_plane_attach_zpos_property(struct drm_plane *plane, - unsigned int zpos) + bool immutable) { - struct drm_device *dev = plane->dev; - struct exynos_drm_private *dev_priv = dev->dev_private; - struct drm_property *prop; - - prop = dev_priv->plane_zpos_property; - if (!prop) { - prop = drm_property_create_range(dev, 0, "zpos", - 0, MAX_PLANE - 1); - if (!prop) - return; - - dev_priv->plane_zpos_property = prop; - } - - drm_object_attach_property(&plane->base, prop, zpos); + if (immutable) + drm_plane_create_zpos_immutable_property(plane, + 0, MAX_PLANE - 1); + else + drm_plane_create_zpos_property(plane, 0, MAX_PLANE - 1); }
int exynos_plane_init(struct drm_device *dev, @@ -346,7 +296,8 @@ int exynos_plane_init(struct drm_device *dev, exynos_plane->index = index; exynos_plane->config = config;
- exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos); + exynos_plane_attach_zpos_property(&exynos_plane->base, + !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
return 0; } diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index 74a4269..e1d47f9 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -477,6 +477,7 @@ static void vp_video_buffer(struct mixer_context *ctx, struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode; struct mixer_resources *res = &ctx->mixer_res; struct drm_framebuffer *fb = state->base.fb; + unsigned int priority = state->base.normalized_zpos + 1; unsigned long flags; dma_addr_t luma_addr[2], chroma_addr[2]; bool tiled_mode = false; @@ -561,7 +562,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay); mixer_cfg_rgb_fmt(ctx, mode->vdisplay); - mixer_cfg_layer(ctx, plane->index, state->zpos + 1, true); + mixer_cfg_layer(ctx, plane->index, priority, true); mixer_cfg_vp_blend(ctx); mixer_run(ctx);
@@ -586,6 +587,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx, struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode; struct mixer_resources *res = &ctx->mixer_res; struct drm_framebuffer *fb = state->base.fb; + unsigned int priority = state->base.normalized_zpos + 1; unsigned long flags; unsigned int win = plane->index; unsigned int x_ratio = 0, y_ratio = 0; @@ -677,7 +679,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay); mixer_cfg_rgb_fmt(ctx, mode->vdisplay); - mixer_cfg_layer(ctx, win, state->zpos + 1, true); + mixer_cfg_layer(ctx, win, priority, true); mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
/* layer update mandatory for mixer 16.0.33.0 */
This patch replaces zpos property handling custom code in rcar DRM driver with calls to generic DRM code.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com Cc: Marek Szyprowski m.szyprowski@samsung.com --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 2 +- drivers/gpu/drm/rcar-du/rcar_du_drv.h | 1 - drivers/gpu/drm/rcar-du/rcar_du_kms.c | 5 ----- drivers/gpu/drm/rcar-du/rcar_du_plane.c | 9 ++------- drivers/gpu/drm/rcar-du/rcar_du_plane.h | 2 -- 5 files changed, 3 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 0d8bdda..28d2cb6 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -196,7 +196,7 @@ void rcar_du_crtc_route_output(struct drm_crtc *crtc,
static unsigned int plane_zpos(struct rcar_du_plane *plane) { - return to_rcar_plane_state(plane->plane.state)->zpos; + return plane->plane.state->normalized_zpos; }
static const struct rcar_du_format_info * diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h index ed35467..c843c31 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h @@ -92,7 +92,6 @@ struct rcar_du_device { struct { struct drm_property *alpha; struct drm_property *colorkey; - struct drm_property *zpos; } props;
unsigned int dpad0_source; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index e70a4f3..4ace0aa 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -527,11 +527,6 @@ static int rcar_du_properties_init(struct rcar_du_device *rcdu) if (rcdu->props.colorkey == NULL) return -ENOMEM;
- rcdu->props.zpos = - drm_property_create_range(rcdu->ddev, 0, "zpos", 1, 7); - if (rcdu->props.zpos == NULL) - return -ENOMEM; - return 0; }
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c index 8460ae1..4764afc 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c @@ -656,7 +656,7 @@ static void rcar_du_plane_reset(struct drm_plane *plane) state->source = RCAR_DU_PLANE_MEMORY; state->alpha = 255; state->colorkey = RCAR_DU_COLORKEY_NONE; - state->zpos = plane->type == DRM_PLANE_TYPE_PRIMARY ? 0 : 1; + plane->state->zpos = plane->type == DRM_PLANE_TYPE_PRIMARY ? 0 : 1;
plane->state = &state->state; plane->state->plane = plane; @@ -674,8 +674,6 @@ static int rcar_du_plane_atomic_set_property(struct drm_plane *plane, rstate->alpha = val; else if (property == rcdu->props.colorkey) rstate->colorkey = val; - else if (property == rcdu->props.zpos) - rstate->zpos = val; else return -EINVAL;
@@ -694,8 +692,6 @@ static int rcar_du_plane_atomic_get_property(struct drm_plane *plane, *val = rstate->alpha; else if (property == rcdu->props.colorkey) *val = rstate->colorkey; - else if (property == rcdu->props.zpos) - *val = rstate->zpos; else return -EINVAL;
@@ -767,8 +763,7 @@ int rcar_du_planes_init(struct rcar_du_group *rgrp) drm_object_attach_property(&plane->plane.base, rcdu->props.colorkey, RCAR_DU_COLORKEY_NONE); - drm_object_attach_property(&plane->plane.base, - rcdu->props.zpos, 1); + drm_plane_create_zpos_property(&plane->plane, 1, 7); }
return 0; diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.h b/drivers/gpu/drm/rcar-du/rcar_du_plane.h index b18b7b2..8b91dd3 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.h @@ -51,7 +51,6 @@ static inline struct rcar_du_plane *to_rcar_plane(struct drm_plane *plane) * @hwindex: 0-based hardware plane index, -1 means unused * @alpha: value of the plane alpha property * @colorkey: value of the plane colorkey property - * @zpos: value of the plane zpos property */ struct rcar_du_plane_state { struct drm_plane_state state; @@ -62,7 +61,6 @@ struct rcar_du_plane_state {
unsigned int alpha; unsigned int colorkey; - unsigned int zpos; };
static inline struct rcar_du_plane_state *
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl index 9dd48f7..0df6abb 100644 --- a/Documentation/DocBook/gpu.tmpl +++ b/Documentation/DocBook/gpu.tmpl @@ -2151,6 +2151,16 @@ void intel_crt_init(struct drm_device *dev) the underlying hardware).</td>
</tr> <tr> + <td valign="top" > "zpos" </td> + <td valign="top" >RANGE</td> + <td valign="top" >Min= driver dependent, Max= driver dependent</td> + <td valign="top" >Plane</td> + <td valign="top" >Plane's 'z' position during blending operation (0 for background, highest for frontmost). + If two planes assigned to same CRTC have equal zpos values, the plane with higher plane + id is treated as closer to front. Can be IMMUTABLE if driver doesn't support changing + planes' order. Exact value range is driver dependent.</td> + </tr> + <tr> <td rowspan="20" valign="top" >i915</td> <td rowspan="2" valign="top" >Generic</td> <td valign="top" >"Broadcast RGB"</td> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 2bd3e5a..df88253 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -2,7 +2,7 @@ # Makefile for the drm device driver. This driver provides support for the # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher. -drm-y := drm_auth.o drm_bufs.o drm_cache.o \ +drm-y := drm_auth.o drm_bufs.o drm_blend.o drm_cache.o \ drm_context.o drm_dma.o \ drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \ drm_lock.o drm_memory.o drm_drv.o drm_vm.o \ diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 86e89db..bd457ca 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -700,6 +700,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane, state->src_h = val; } else if (property == config->rotation_property) { state->rotation = val; + } else if (property == plane->zpos_property) { + state->zpos = val; } else if (plane->funcs->atomic_set_property) { return plane->funcs->atomic_set_property(plane, state, property, val); @@ -756,6 +758,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane, *val = state->src_h; } else if (property == config->rotation_property) { *val = state->rotation; + } else if (property == plane->zpos_property) { + *val = state->zpos; } else if (plane->funcs->atomic_get_property) { return plane->funcs->atomic_get_property(plane, state, property, val); } else { diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 997fd21..f10652f 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -32,6 +32,8 @@ #include <drm/drm_atomic_helper.h> #include <linux/fence.h> +#include "drm_crtc_internal.h" + /** * DOC: overview * @@ -587,6 +589,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev, struct drm_plane_state *plane_state; int i, ret = 0; + ret = drm_atomic_helper_normalize_zpos(dev, state); + if (ret) + return ret; + for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@ +/* + * Copyright (C) 2016 Samsung Electronics Co.Ltd + * Authors: + * Marek Szyprowski <m.szyprowski@samsung.com> + * + * DRM core plane blending related functions + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ +#include <drm/drmP.h> +#include <drm/drm_atomic.h> +#include <drm/drm_crtc.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/sort.h> + +#include "drm_internal.h" + +/** + * drm_plane_create_zpos_property - create mutable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic mutable zpos property and enables support + * for it in drm core. Drivers can then attach this property to planes to enable + * support for configurable planes arrangement during blending operation. + * Once mutable zpos property has been enabled, the DRM core will automatically + * calculate drm_plane_state->normalized_zpos values. Usually min should be set + * to 0 and max to maximal number of planes for given crtc - 1. + * + * If zpos of some planes cannot be changed (like fixed background or + * cursor/topmost planes), driver should adjust min/max values and assign those + * planes immutable zpos property with lower or higher values (for more + * information, see drm_mode_create_zpos_immutable_property() function). In such + * case driver should also assign proper initial zpos values for all planes in + * its plane_reset() callback, so the planes will be always sorted properly. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_property); + +/** + * drm_plane_create_zpos_immutable_property - create immuttable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic immutable zpos property and enables + * support for it in drm core. Using this property driver lets userspace + * to get the arrangement of the planes for blending operation and notifies + * it that the hardware (or driver) doesn't support changing of the planes' + * order. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, + "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); + +static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{ + const struct drm_plane_state *sa = *(struct drm_plane_state **)a; + const struct drm_plane_state *sb = *(struct drm_plane_state **)b; + + if (sa->zpos != sb->zpos) + return sa->zpos - sb->zpos; + else + return sa->plane->base.id - sb->plane->base.id; +}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values
- @crtc: crtc with planes, which have to be considered for normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given crtc and
- calculates normalized zpos value for them. Planes are compared first by their
- zpos values, then by plane id (if zpos equals). Plane with lowest zpos value
- is at the bottom. The plane_state->normalized_zpos is then filled with unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}
Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);states[i]->normalized_zpos = zpos;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",plane->base.id, plane->name, zpos);- }
- crtc_state->zpos_changed = true;
+done:
- kfree(states);
- return ret;
+} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
+/**
- drm_atomic_helper_normalize_zpos - calculate normalized zpos values for all
crtcs
- @dev: DRM device
- @state: atomic state of DRM device
- This function calculates normalized zpos value for all modified planes in
- the provided atomic state of DRM device. For more information, see
- drm_atomic_helper_crtc_normalize_zpos() function.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_normalize_zpos(struct drm_device *dev,
struct drm_atomic_state *state)+{
- struct drm_crtc *crtc;
- struct drm_crtc_state *crtc_state;
- struct drm_plane *plane;
- struct drm_plane_state *plane_state;
- int i, ret = 0;
- for_each_plane_in_state(state, plane, plane_state, i) {
crtc = plane_state->crtc;if (!crtc)continue;if (plane->state->zpos != plane_state->zpos) {crtc_state =drm_atomic_get_existing_crtc_state(state, crtc);crtc_state->zpos_changed = true;}- }
- for_each_crtc_in_state(state, crtc, crtc_state, i) {
if (crtc_state->plane_mask != crtc->state->plane_mask ||crtc_state->zpos_changed) {ret = drm_atomic_helper_crtc_normalize_zpos(crtc,crtc_state);if (ret)return ret;}- }
- return 0;
+} +EXPORT_SYMBOL(drm_atomic_helper_normalize_zpos); diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index a78c138..37d9068 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -42,3 +42,6 @@ int drm_atomic_get_property(struct drm_mode_object *obj, int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv); +/* drm_blend.c */ +int drm_atomic_helper_normalize_zpos(struct drm_device *dev,
struct drm_atomic_state *state);diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index d1559cd..921c93f 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -305,6 +305,7 @@ struct drm_plane_helper_funcs;
- @mode_changed: crtc_state->mode or crtc_state->enable has been changed
- @active_changed: crtc_state->active has been toggled.
- @connectors_changed: connectors to this crtc have been updated
- @zpos_changed: zpos values of planes on this crtc have been updated
- @color_mgmt_changed: color management properties have changed (degamma or
- gamma LUT or CSC matrix)
- @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
@@ -340,6 +341,7 @@ struct drm_crtc_state { bool mode_changed : 1; bool active_changed : 1; bool connectors_changed : 1;
- bool zpos_changed : 1; bool color_mgmt_changed : 1;
/* attached planes bitmask: @@ -1263,6 +1265,9 @@ struct drm_connector {
- plane (in 16.16)
- @src_w: width of visible portion of plane (in 16.16)
- @src_h: height of visible portion of plane (in 16.16)
- @zpos: priority of the given plane on crtc (optional)
- @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1
*/
for given crtc- @state: backpointer to global drm_atomic_state
struct drm_plane_state { @@ -1283,6 +1288,10 @@ struct drm_plane_state { /* Plane rotation */ unsigned int rotation;
- /* Plane zpos */
- unsigned int zpos;
- unsigned int normalized_zpos;
- struct drm_atomic_state *state;
}; @@ -1516,6 +1525,7 @@ enum drm_plane_type {
- @properties: property tracking for this plane
- @type: type of plane (overlay, primary, cursor)
- @state: current atomic state for this plane
*/
- @zpos_property: zpos property for this plane
struct drm_plane { struct drm_device *dev; @@ -1546,6 +1556,8 @@ struct drm_plane { const struct drm_plane_helper_funcs *helper_private; struct drm_plane_state *state;
- struct drm_property *zpos_property;
}; /** @@ -2554,6 +2566,22 @@ extern struct drm_property *drm_mode_create_rotation_property(struct drm_device extern unsigned int drm_rotation_simplify(unsigned int rotation, unsigned int supported_rotations); +int drm_plane_atomic_set_zpos_property(struct drm_plane *plane,
struct drm_plane_state *state,struct drm_property *property,uint64_t val);+int drm_plane_atomic_get_zpos_property(struct drm_plane *plane,
const struct drm_plane_state *state,struct drm_property *property,uint64_t *val);+int drm_plane_create_zpos_property(struct drm_plane *plane,
unsigned int min, unsigned int max);+int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
unsigned int min,unsigned int max);/* Helpers */ static inline struct drm_plane *drm_plane_find(struct drm_device *dev, -- 1.9.1
Hi Ville,
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 +++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@
[snip]
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{
- const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
- const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
- if (sa->zpos != sb->zpos)
return sa->zpos - sb->zpos;- else
return sa->plane->base.id - sb->plane->base.id;+}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos
values
- @crtc: crtc with planes, which have to be considered for normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given crtc
and
- calculates normalized zpos value for them. Planes are compared first
by their
- zpos values, then by plane id (if zpos equals). Plane with lowest zpos
value
- is at the bottom. The plane_state->normalized_zpos is then filled with
unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);
The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver-specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi-random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
states[i]->normalized_zpos = zpos;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",plane->base.id, plane->name, zpos);- }
- crtc_state->zpos_changed = true;
+done:
- kfree(states);
- return ret;
+} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
On Thu, May 12, 2016 at 10:20:12PM +0300, Laurent Pinchart wrote:
Hi Ville,
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 +++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@
[snip]
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{
- const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
- const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
- if (sa->zpos != sb->zpos)
return sa->zpos - sb->zpos;- else
return sa->plane->base.id - sb->plane->base.id;+}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
It just eliminates duplicate zpos values. It won't re-sort your plane states magically or anything like that. Nor does it guarantee that the zpos values for the actually visible planes are even contiguous.
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos
values
- @crtc: crtc with planes, which have to be considered for normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given crtc
and
- calculates normalized zpos value for them. Planes are compared first
by their
- zpos values, then by plane id (if zpos equals). Plane with lowest zpos
value
- is at the bottom. The plane_state->normalized_zpos is then filled with
unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver-specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi-random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
The point of exposing ranges is to give userspace at least some chance of getting the order right. Otherwise it'll just have to randomly try different orders until something works. Most hardware is quite constrained in this. Some don't support changing the zpos at all, in which case we would set min==max.
states[i]->normalized_zpos = zpos;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",plane->base.id, plane->name, zpos);- }
- crtc_state->zpos_changed = true;
+done:
- kfree(states);
- return ret;
+} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
-- Regards,
Laurent Pinchart
Hi Ville,
On Thursday 12 May 2016 22:46:05 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 10:20:12PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@
[snip]
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{
- const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
- const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
- if (sa->zpos != sb->zpos)
return sa->zpos - sb->zpos;- else
return sa->plane->base.id - sb->plane->base.id;+}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
It just eliminates duplicate zpos values. It won't re-sort your plane states magically or anything like that. Nor does it guarantee that the zpos values for the actually visible planes are even contiguous.
To make normalization useful in my case I need contiguous values starting at 0.
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
Any opinion on this ?
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos
values
- @crtc: crtc with planes, which have to be considered for
normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given
crtc and
- calculates normalized zpos value for them. Planes are compared
first by their
- zpos values, then by plane id (if zpos equals). Plane with lowest
zpos value
- is at the bottom. The plane_state->normalized_zpos is then filled
with unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos
values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver-specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi-random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
The point of exposing ranges is to give userspace at least some chance of getting the order right. Otherwise it'll just have to randomly try different orders until something works. Most hardware is quite constrained in this.
Could you educate me by giving a few real world examples ?
Some don't support changing the zpos at all, in which case we would set min==max.
But all this doesn't require adjusting the normalized zpos to take the original zpos constraints into account, does it ? Why can normalized_zpos be constrained to the range 0 to N-1, giving drivers the sorted planes and then letting them convert that to device-specific values ?
states[i]->normalized_zpos = zpos;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",plane->base.id, plane->name, zpos);- }
- crtc_state->zpos_changed = true;
+done:
- kfree(states);
- return ret;
+} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
On Thu, May 12, 2016 at 11:15:42PM +0300, Laurent Pinchart wrote:
Hi Ville,
On Thursday 12 May 2016 22:46:05 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 10:20:12PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@
[snip]
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{
- const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
- const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
- if (sa->zpos != sb->zpos)
return sa->zpos - sb->zpos;- else
return sa->plane->base.id - sb->plane->base.id;+}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
It just eliminates duplicate zpos values. It won't re-sort your plane states magically or anything like that. Nor does it guarantee that the zpos values for the actually visible planes are even contiguous.
To make normalization useful in my case I need contiguous values starting at 0.
Contigious values for all the planes on the whole device or on one crtc? And what about the visible vs. not plane issue? Is it OK to have an invisible plane somewhere in the middle of the zpos sequence?
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
Any opinion on this ?
Not really. I already asked if we had a good use case for it. Dunno if anyone has one.
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos
values
- @crtc: crtc with planes, which have to be considered for
normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given
crtc and
- calculates normalized zpos value for them. Planes are compared
first by their
- zpos values, then by plane id (if zpos equals). Plane with lowest
zpos value
- is at the bottom. The plane_state->normalized_zpos is then filled
with unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos
values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver-specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi-random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
The point of exposing ranges is to give userspace at least some chance of getting the order right. Otherwise it'll just have to randomly try different orders until something works. Most hardware is quite constrained in this.
Could you educate me by giving a few real world examples ?
Well, on Intel we have the simple case on many platforms (bottom->top): primary->sprite->cursor Most PC hardware from some years ago was similar. More modern stuff from the other vendors might be more capable, not sure.
We also have another class of Intel hardware which has primary, two sprites, and a cursor. The cursor is always on top, the other three planes can be in any order amongst themselves.
The oldest Intel hardware we support is even more flexible. Those had sort of 1 proper primary plane, 2 sprite planes, 1 video overlay, and 2 cursor planes. Normally they're spread among two crtcs, but they can all be moved to a single crtc and then ordering constraints between them are fairly convoluted.
As far as I can remember OMAP (at least 3 and maybe 4) had a totally fixed order. GFX->VID1->VID2. Perhaps they changed this later, dunno.
One extra complication in this is destination color keying. What that tends to do effectively is push some sprite/overlay plane below the primary and punch a hole into the primary, but otherwise the sprite/overlay sits above the primary. Not sure if we should make this sort of thing explicit in the zpos API or if we should just declare color keying somehow magic and potentially ignore some of the zpos properties.
Some don't support changing the zpos at all, in which case we would set min==max.
But all this doesn't require adjusting the normalized zpos to take the original zpos constraints into account, does it ? Why can normalized_zpos be constrained to the range 0 to N-1, giving drivers the sorted planes and then letting them convert that to device-specific values ?
Oh, I didn't even notice that it was mixing up the normalized and non-normalized coordinates. Yes, that does seem wrong to me. The fact that the ioctl would have rejected the out of range non-normalized coordinates should already guarantee that the resulting normalized coordinates end up in roughly the right order. That is, at least the order between different "zpos groups" of planes would be already respected. Eg. in the Intel "3 freely ordered planes + cursor" case there would be no way to push the cursor below any other plane.
Hi Ville,
On Thursday 12 May 2016 23:54:09 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 11:15:42PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 22:46:05 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 10:20:12PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 +++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@
[snip]
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{
- const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
- const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
- if (sa->zpos != sb->zpos)
return sa->zpos - sb->zpos;- else
return sa->plane->base.id - sb->plane->base.id;+}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
It just eliminates duplicate zpos values. It won't re-sort your plane states magically or anything like that. Nor does it guarantee that the zpos values for the actually visible planes are even contiguous.
To make normalization useful in my case I need contiguous values starting at 0.
Contigious values for all the planes on the whole device or on one crtc? And what about the visible vs. not plane issue? Is it OK to have an invisible plane somewhere in the middle of the zpos sequence?
In my case it would be per-CRTC, and invisible planes in the middle wouldn't be an issue.
To make normalization useful it needs to compute values that are usable by the majority of drivers. The question then becomes what should those values be ? Generally speaking they should be easy to convert to driver-specific values. That's why I believe we need feedback from driver developers on this topic.
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
Any opinion on this ?
Not really. I already asked if we had a good use case for it. Dunno if anyone has one.
Non-atomic userspace needing to swap planes is such a use case. The question is whether we want to support it.
For atomic, the reason I can see to support the same feature is to make it easier for userspace to modify the zorder of a plane without requiring updates to all other planes. I don't have a strong opinion on that, but we need to decide whether we want to support it or not.
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
+/**
- drm_atomic_helper_crtc_normalize_zpos - calculate normalized
zpos values
- @crtc: crtc with planes, which have to be considered for
normalization
- @crtc_state: new atomic state to apply
- This function checks new states of all planes assigned to given
crtc and
- calculates normalized zpos value for them. Planes are compared
first by their
- zpos values, then by plane id (if zpos equals). Plane with
lowest zpos value
- is at the bottom. The plane_state->normalized_zpos is then
filled with unique
- values from 0 to number of active planes in crtc minus one.
- RETURNS
- Zero for success or -errno
- */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)+{
- struct drm_atomic_state *state = crtc_state->state;
- struct drm_device *dev = crtc->dev;
- int total_planes = dev->mode_config.num_total_plane;
- struct drm_plane_state **states;
- struct drm_plane *plane;
- int i, zpos, n = 0;
- int ret = 0;
- DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos
values\n",
crtc->base.id, crtc->name);- states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
- if (!states)
return -ENOMEM;- /*
* Normalization process might create new states for planes which* normalized_zpos has to be recalculated.*/- drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =drm_atomic_get_plane_state(state, plane);if (IS_ERR(plane_state)) {ret = PTR_ERR(plane_state);goto done;}Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
states[n++] = plane_state;DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",plane->base.id, plane->name,plane_state->zpos);- }
- sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
- for (i = 0, zpos = 0; i < n; i++, zpos++) {
plane = states[i]->plane;zpos = max_t(int, zpos, states[i]->zpos);The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver- specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi- random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
The point of exposing ranges is to give userspace at least some chance of getting the order right. Otherwise it'll just have to randomly try different orders until something works. Most hardware is quite constrained in this.
Could you educate me by giving a few real world examples ?
Well, on Intel we have the simple case on many platforms (bottom->top): primary->sprite->cursor Most PC hardware from some years ago was similar. More modern stuff from the other vendors might be more capable, not sure.
We also have another class of Intel hardware which has primary, two sprites, and a cursor. The cursor is always on top, the other three planes can be in any order amongst themselves.
The oldest Intel hardware we support is even more flexible. Those had sort of 1 proper primary plane, 2 sprite planes, 1 video overlay, and 2 cursor planes. Normally they're spread among two crtcs, but they can all be moved to a single crtc and then ordering constraints between them are fairly convoluted.
Thank you for the information.
As far as I can remember OMAP (at least 3 and maybe 4) had a totally fixed order. GFX->VID1->VID2. Perhaps they changed this later, dunno.
OMAP3 has a fixed Z-order, while OMAP4 seems to be configurable according to the omapdrm driver.
One extra complication in this is destination color keying. What that tends to do effectively is push some sprite/overlay plane below the primary and punch a hole into the primary, but otherwise the sprite/overlay sits above the primary. Not sure if we should make this sort of thing explicit in the zpos API or if we should just declare color keying somehow magic and potentially ignore some of the zpos properties.
Color-keying is a quite common feature, I think we should standardize properties to support it, which would then require defining the behaviour, including how it interacts with Z-order.
Some don't support changing the zpos at all, in which case we would set min==max.
But all this doesn't require adjusting the normalized zpos to take the original zpos constraints into account, does it ? Why can normalized_zpos
s/can/can't/
be constrained to the range 0 to N-1, giving drivers the sorted planes and then letting them convert that to device-specific values ?
Oh, I didn't even notice that it was mixing up the normalized and non-normalized coordinates. Yes, that does seem wrong to me. The fact that the ioctl would have rejected the out of range non-normalized coordinates should already guarantee that the resulting normalized coordinates end up in roughly the right order. That is, at least the order between different "zpos groups" of planes would be already respected. Eg. in the Intel "3 freely ordered planes + cursor" case there would be no way to push the cursor below any other plane.
I agree with you, and I still think that computing the zpos_normalized values in the 0 to N-1 range (N being the number of visible planes for the CRTC) would be the best option.
On Tue, May 24, 2016 at 05:01:02PM +0300, Laurent Pinchart wrote:
Hi Ville,
On Thursday 12 May 2016 23:54:09 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 11:15:42PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 22:46:05 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 10:20:12PM +0300, Laurent Pinchart wrote:
On Thursday 12 May 2016 14:51:55 Ville Syrjälä wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote: > From: Marek Szyprowski m.szyprowski@samsung.com > > This patch adds support for generic plane's zpos property property > with well-defined semantics: > - added zpos properties to plane and plane state structures > - added helpers for normalizing zpos properties of given set of > planes > - well defined semantics: planes are sorted by zpos values and then > plane id value if zpos equals > > Normalized zpos values are calculated automatically when generic > muttable zpos property has been initialized. Drivers can simply use > plane_state->normalized_zpos in their atomic_check and/or > plane_update callbacks without any additional calls to DRM core. > > Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com > > Compare to Marek's original patch zpos property is now specific to > each plane and no more to the core. > Normalize function take care of the range of per plane defined range > before set normalized_zpos. > > Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org > > Cc: Inki Dae inki.dae@samsung.com > Cc: Daniel Vetter daniel@ffwll.ch > Cc: Ville Syrjala ville.syrjala@linux.intel.com > Cc: Joonyoung Shim jy0922.shim@samsung.com > Cc: Seung-Woo Kim sw0312.kim@samsung.com > Cc: Andrzej Hajda a.hajda@samsung.com > Cc: Krzysztof Kozlowski k.kozlowski@samsung.com > Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com > Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de > Cc: Gustavo Padovan gustavo@padovan.org > Cc: vincent.abriou@st.com > Cc: fabien.dessenne@st.com > Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com > --- > > Documentation/DocBook/gpu.tmpl | 10 ++ > drivers/gpu/drm/Makefile | 2 +- > drivers/gpu/drm/drm_atomic.c | 4 + > drivers/gpu/drm/drm_atomic_helper.c | 6 + > drivers/gpu/drm/drm_blend.c | 229 +++++++++++++++++++++++++ > drivers/gpu/drm/drm_crtc_internal.h | 3 + > include/drm/drm_crtc.h | 28 +++++ > 7 files changed, 281 insertions(+), 1 deletion(-) > create mode 100644 drivers/gpu/drm/drm_blend.c
[snip]
> diff --git a/drivers/gpu/drm/drm_blend.c > b/drivers/gpu/drm/drm_blend.c > new file mode 100644 > index 0000000..eef59bb > --- /dev/null > +++ b/drivers/gpu/drm/drm_blend.c > @@ -0,0 +1,229 @@
[snip]
> +static int drm_atomic_state_zpos_cmp(const void *a, const void *b) > +{ > + const struct drm_plane_state *sa = *(struct drm_plane_state **)a; > + const struct drm_plane_state *sb = *(struct drm_plane_state **)b; > + > + if (sa->zpos != sb->zpos) > + return sa->zpos - sb->zpos; > + else > + return sa->plane->base.id - sb->plane->base.id; > +}
Still not really convinced this normalization is a good idea when we have atomic. It made sense before atomic since otherwise you might not be able to swap the zpos of two planes without shutting one of them down, but it makes interpreting the zpos prop values more confusing. And with atomic we don't actually need it AFAICS. Or do we have an actual use case for this behaviour?
Speaking selfishly about my use case (rcar-du-drm), I need to sort planes in display order from 0 to N-1 as that's how the hardware is programmed. Normalization gives me an array of sorted planes, which is exactly what I need. I expect other drivers to have similar requirements, so normalization in the core will allow code sharing.
It just eliminates duplicate zpos values. It won't re-sort your plane states magically or anything like that. Nor does it guarantee that the zpos values for the actually visible planes are even contiguous.
To make normalization useful in my case I need contiguous values starting at 0.
Contigious values for all the planes on the whole device or on one crtc? And what about the visible vs. not plane issue? Is it OK to have an invisible plane somewhere in the middle of the zpos sequence?
In my case it would be per-CRTC, and invisible planes in the middle wouldn't be an issue.
To make normalization useful it needs to compute values that are usable by the majority of drivers. The question then becomes what should those values be ? Generally speaking they should be easy to convert to driver-specific values. That's why I believe we need feedback from driver developers on this topic.
Now, is your concern that allowing two planes to have the same zpos isn't needed with the atomic API ? I agree with that, but it would also make it impossible to swap two planes using the legacy API implemented on top of atomic drivers. I'll let others decide whether this is considered as a concern.
Any opinion on this ?
Not really. I already asked if we had a good use case for it. Dunno if anyone has one.
Non-atomic userspace needing to swap planes is such a use case. The question is whether we want to support it.
I was more asking if anyone is actually doing that, and do they need it to keep working.
For atomic, the reason I can see to support the same feature is to make it easier for userspace to modify the zorder of a plane without requiring updates to all other planes. I don't have a strong opinion on that, but we need to decide whether we want to support it or not.
Not sure it really helps in any measurable way. It might save a few properties from getting pushed to the kernel, but that's all. Eg. if userspace would maintain some kind of stack of planes in the right zorder, then pushing a new plane into the middle of the stack would required that it figures out the right zorder for that position. That would be something like z=clamp(below_z + 1, below_z, above_z). After that it would have to figure out if the magic conflict resolution will result in the right zorder should below_z==z or above_z==z, and if not it would have to change below_z and/or above_z too. That process could ripple all the way through the entire stack. Seems to me that it would be far easier to just readjust the z order for all the planes above from the get go.
While at it, Benjamin told me that you've requested configurable min/max values per plane, what are your use cases for that ? On the same topic, please see below.
> + > +/** > + * drm_atomic_helper_crtc_normalize_zpos - calculate normalized > zpos values > + * @crtc: crtc with planes, which have to be considered for > normalization > + * @crtc_state: new atomic state to apply > + * > + * This function checks new states of all planes assigned to given > crtc and > + * calculates normalized zpos value for them. Planes are compared > first by their > + * zpos values, then by plane id (if zpos equals). Plane with > lowest zpos value > + * is at the bottom. The plane_state->normalized_zpos is then > filled with unique > + * values from 0 to number of active planes in crtc minus one. > + * > + * RETURNS > + * Zero for success or -errno > + */ > +int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, > + struct drm_crtc_state *crtc_state) > +{ > + struct drm_atomic_state *state = crtc_state->state; > + struct drm_device *dev = crtc->dev; > + int total_planes = dev->mode_config.num_total_plane; > + struct drm_plane_state **states; > + struct drm_plane *plane; > + int i, zpos, n = 0; > + int ret = 0; > + > + DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos > values\n", > + crtc->base.id, crtc->name); > + > + states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
kmalloc_array(..., GFP_TEMPORARY);
> + if (!states) > + return -ENOMEM; > + > + /* > + * Normalization process might create new states for planes which > + * normalized_zpos has to be recalculated. > + */ > + drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { > + struct drm_plane_state *plane_state = > + drm_atomic_get_plane_state(state, plane); > + if (IS_ERR(plane_state)) { > + ret = PTR_ERR(plane_state); > + goto done; > + }
Hmm. So if we change the zpos for any plane, we get to re-check every plane. Not the most efficient thing perhaps, since on some hardware you might only have a subset of planes that can even change their zpos. OTOH I suppose it does make life a bit simpler when you don't have to think which planes might be affected, so I guess it's fine.
> + states[n++] = plane_state; > + DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n", > + plane->base.id, plane->name, > + plane_state->zpos); > + } > + > + sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); > + > + for (i = 0, zpos = 0; i < n; i++, zpos++) { > + plane = states[i]->plane; > + > + zpos = max_t(int, zpos, states[i]->zpos);
The purpose of this code is to support the per-plane min/max zpos values. As Benjamin explained, for example if the zpos range is [0,2] for plane X and [4,6] for plane Y, we need to be sure the min zpos value of plane Y is 4. To this I replied that's exactly what I'd rather avoid. I think the core code should take care of sorting planes, taking driver- specific constraints into account when possible (too exotic constraints can always be implemented directly by drivers), and then leave to the drivers the responsibility of taking the sorted planes array and computing whatever hardware-specific configuration is needed. Sorting planes from 0 to N-1 seems to be like a better API than having semi- random values for the normalized zpos. Do we have use cases that wouldn't be covered by a simpler implementation ?
The point of exposing ranges is to give userspace at least some chance of getting the order right. Otherwise it'll just have to randomly try different orders until something works. Most hardware is quite constrained in this.
Could you educate me by giving a few real world examples ?
Well, on Intel we have the simple case on many platforms (bottom->top): primary->sprite->cursor Most PC hardware from some years ago was similar. More modern stuff from the other vendors might be more capable, not sure.
We also have another class of Intel hardware which has primary, two sprites, and a cursor. The cursor is always on top, the other three planes can be in any order amongst themselves.
The oldest Intel hardware we support is even more flexible. Those had sort of 1 proper primary plane, 2 sprite planes, 1 video overlay, and 2 cursor planes. Normally they're spread among two crtcs, but they can all be moved to a single crtc and then ordering constraints between them are fairly convoluted.
Thank you for the information.
As far as I can remember OMAP (at least 3 and maybe 4) had a totally fixed order. GFX->VID1->VID2. Perhaps they changed this later, dunno.
OMAP3 has a fixed Z-order, while OMAP4 seems to be configurable according to the omapdrm driver.
One extra complication in this is destination color keying. What that tends to do effectively is push some sprite/overlay plane below the primary and punch a hole into the primary, but otherwise the sprite/overlay sits above the primary. Not sure if we should make this sort of thing explicit in the zpos API or if we should just declare color keying somehow magic and potentially ignore some of the zpos properties.
Color-keying is a quite common feature, I think we should standardize properties to support it, which would then require defining the behaviour, including how it interacts with Z-order.
Some don't support changing the zpos at all, in which case we would set min==max.
But all this doesn't require adjusting the normalized zpos to take the original zpos constraints into account, does it ? Why can normalized_zpos
s/can/can't/
be constrained to the range 0 to N-1, giving drivers the sorted planes and then letting them convert that to device-specific values ?
Oh, I didn't even notice that it was mixing up the normalized and non-normalized coordinates. Yes, that does seem wrong to me. The fact that the ioctl would have rejected the out of range non-normalized coordinates should already guarantee that the resulting normalized coordinates end up in roughly the right order. That is, at least the order between different "zpos groups" of planes would be already respected. Eg. in the Intel "3 freely ordered planes + cursor" case there would be no way to push the cursor below any other plane.
I agree with you, and I still think that computing the zpos_normalized values in the 0 to N-1 range (N being the number of visible planes for the CRTC) would be the best option.
You can't actually know what's visible when this gets called.
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
- added zpos properties to plane and plane state structures
- added helpers for normalizing zpos properties of given set of planes
- well defined semantics: planes are sorted by zpos values and then plane id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
When resending you must have a changelog somewhere. At elast in the cover letter, better is per-patch. Otherwise reviewers need to dig out the old threads and compare themselves. -Daniel
Documentation/DocBook/gpu.tmpl | 10 ++ drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_helper.c | 6 + drivers/gpu/drm/drm_blend.c | 229 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_crtc_internal.h | 3 + include/drm/drm_crtc.h | 28 +++++ 7 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_blend.c
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl index 9dd48f7..0df6abb 100644 --- a/Documentation/DocBook/gpu.tmpl +++ b/Documentation/DocBook/gpu.tmpl @@ -2151,6 +2151,16 @@ void intel_crt_init(struct drm_device *dev) the underlying hardware).</td>
</tr> <tr> + <td valign="top" > "zpos" </td> + <td valign="top" >RANGE</td> + <td valign="top" >Min= driver dependent, Max= driver dependent</td> + <td valign="top" >Plane</td> + <td valign="top" >Plane's 'z' position during blending operation (0 for background, highest for frontmost). + If two planes assigned to same CRTC have equal zpos values, the plane with higher plane + id is treated as closer to front. Can be IMMUTABLE if driver doesn't support changing + planes' order. Exact value range is driver dependent.</td> + </tr> + <tr> <td rowspan="20" valign="top" >i915</td> <td rowspan="2" valign="top" >Generic</td> <td valign="top" >"Broadcast RGB"</td> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 2bd3e5a..df88253 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -2,7 +2,7 @@ # Makefile for the drm device driver. This driver provides support for the # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher. -drm-y := drm_auth.o drm_bufs.o drm_cache.o \ +drm-y := drm_auth.o drm_bufs.o drm_blend.o drm_cache.o \ drm_context.o drm_dma.o \ drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \ drm_lock.o drm_memory.o drm_drv.o drm_vm.o \ diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 86e89db..bd457ca 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -700,6 +700,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane, state->src_h = val; } else if (property == config->rotation_property) { state->rotation = val; + } else if (property == plane->zpos_property) { + state->zpos = val; } else if (plane->funcs->atomic_set_property) { return plane->funcs->atomic_set_property(plane, state, property, val); @@ -756,6 +758,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane, *val = state->src_h; } else if (property == config->rotation_property) { *val = state->rotation; + } else if (property == plane->zpos_property) { + *val = state->zpos; } else if (plane->funcs->atomic_get_property) { return plane->funcs->atomic_get_property(plane, state, property, val); } else { diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 997fd21..f10652f 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -32,6 +32,8 @@ #include <drm/drm_atomic_helper.h> #include <linux/fence.h> +#include "drm_crtc_internal.h" + /** * DOC: overview * @@ -587,6 +589,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev, struct drm_plane_state *plane_state; int i, ret = 0; + ret = drm_atomic_helper_normalize_zpos(dev, state); + if (ret) + return ret; + for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c new file mode 100644 index 0000000..eef59bb --- /dev/null +++ b/drivers/gpu/drm/drm_blend.c @@ -0,0 +1,229 @@ +/* + * Copyright (C) 2016 Samsung Electronics Co.Ltd + * Authors: + * Marek Szyprowski <m.szyprowski@samsung.com> + * + * DRM core plane blending related functions + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ +#include <drm/drmP.h> +#include <drm/drm_atomic.h> +#include <drm/drm_crtc.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/sort.h> + +#include "drm_internal.h" + +/** + * drm_plane_create_zpos_property - create mutable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic mutable zpos property and enables support + * for it in drm core. Drivers can then attach this property to planes to enable + * support for configurable planes arrangement during blending operation. + * Once mutable zpos property has been enabled, the DRM core will automatically + * calculate drm_plane_state->normalized_zpos values. Usually min should be set + * to 0 and max to maximal number of planes for given crtc - 1. + * + * If zpos of some planes cannot be changed (like fixed background or + * cursor/topmost planes), driver should adjust min/max values and assign those + * planes immutable zpos property with lower or higher values (for more + * information, see drm_mode_create_zpos_immutable_property() function). In such + * case driver should also assign proper initial zpos values for all planes in + * its plane_reset() callback, so the planes will be always sorted properly. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_property); + +/** + * drm_plane_create_zpos_immutable_property - create immuttable zpos property + * @plane: drm plane + * @min: minimal possible value of zpos property + * @max: maximal possible value of zpos property + * + * This function initializes generic immutable zpos property and enables + * support for it in drm core. Using this property driver lets userspace + * to get the arrangement of the planes for blending operation and notifies + * it that the hardware (or driver) doesn't support changing of the planes' + * order. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, + unsigned int min, unsigned int max) +{ + struct drm_property *prop; + + prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, + "zpos", min, max); + if (!prop) + return -ENOMEM; + + drm_object_attach_property(&plane->base, prop, min); + + plane->zpos_property = prop; + return 0; +} +EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); + +static int drm_atomic_state_zpos_cmp(const void *a, const void *b) +{ + const struct drm_plane_state *sa = *(struct drm_plane_state **)a; + const struct drm_plane_state *sb = *(struct drm_plane_state **)b; + + if (sa->zpos != sb->zpos) + return sa->zpos - sb->zpos; + else + return sa->plane->base.id - sb->plane->base.id; +} + +/** + * drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values + * @crtc: crtc with planes, which have to be considered for normalization + * @crtc_state: new atomic state to apply + * + * This function checks new states of all planes assigned to given crtc and + * calculates normalized zpos value for them. Planes are compared first by their + * zpos values, then by plane id (if zpos equals). Plane with lowest zpos value + * is at the bottom. The plane_state->normalized_zpos is then filled with unique + * values from 0 to number of active planes in crtc minus one. + * + * RETURNS + * Zero for success or -errno + */ +int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, + struct drm_crtc_state *crtc_state) +{ + struct drm_atomic_state *state = crtc_state->state; + struct drm_device *dev = crtc->dev; + int total_planes = dev->mode_config.num_total_plane; + struct drm_plane_state **states; + struct drm_plane *plane; + int i, zpos, n = 0; + int ret = 0; + + DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", + crtc->base.id, crtc->name); + + states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL); + if (!states) + return -ENOMEM; + + /* + * Normalization process might create new states for planes which + * normalized_zpos has to be recalculated. + */ + drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { + struct drm_plane_state *plane_state = + drm_atomic_get_plane_state(state, plane); + if (IS_ERR(plane_state)) { + ret = PTR_ERR(plane_state); + goto done; + } + states[n++] = plane_state; + DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n", + plane->base.id, plane->name, + plane_state->zpos); + } + + sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); + + for (i = 0, zpos = 0; i < n; i++, zpos++) { + plane = states[i]->plane; + + zpos = max_t(int, zpos, states[i]->zpos); + + states[i]->normalized_zpos = zpos; + DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n", + plane->base.id, plane->name, zpos); + } + crtc_state->zpos_changed = true; + +done: + kfree(states); + return ret; +} +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos); + +/** + * drm_atomic_helper_normalize_zpos - calculate normalized zpos values for all + * crtcs + * @dev: DRM device + * @state: atomic state of DRM device + * + * This function calculates normalized zpos value for all modified planes in + * the provided atomic state of DRM device. For more information, see + * drm_atomic_helper_crtc_normalize_zpos() function. + * + * RETURNS + * Zero for success or -errno + */ +int drm_atomic_helper_normalize_zpos(struct drm_device *dev, + struct drm_atomic_state *state) +{ + struct drm_crtc *crtc; + struct drm_crtc_state *crtc_state; + struct drm_plane *plane; + struct drm_plane_state *plane_state; + int i, ret = 0; + + for_each_plane_in_state(state, plane, plane_state, i) { + crtc = plane_state->crtc; + if (!crtc) + continue; + if (plane->state->zpos != plane_state->zpos) { + crtc_state = + drm_atomic_get_existing_crtc_state(state, crtc); + crtc_state->zpos_changed = true; + } + } + + for_each_crtc_in_state(state, crtc, crtc_state, i) { + if (crtc_state->plane_mask != crtc->state->plane_mask || + crtc_state->zpos_changed) { + ret = drm_atomic_helper_crtc_normalize_zpos(crtc, + crtc_state); + if (ret) + return ret; + } + } + return 0; +} +EXPORT_SYMBOL(drm_atomic_helper_normalize_zpos); diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index a78c138..37d9068 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -42,3 +42,6 @@ int drm_atomic_get_property(struct drm_mode_object *obj, int drm_mode_atomic_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv); +/* drm_blend.c */ +int drm_atomic_helper_normalize_zpos(struct drm_device *dev, + struct drm_atomic_state *state); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index d1559cd..921c93f 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -305,6 +305,7 @@ struct drm_plane_helper_funcs; * @mode_changed: crtc_state->mode or crtc_state->enable has been changed * @active_changed: crtc_state->active has been toggled. * @connectors_changed: connectors to this crtc have been updated + * @zpos_changed: zpos values of planes on this crtc have been updated * @color_mgmt_changed: color management properties have changed (degamma or * gamma LUT or CSC matrix) * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes @@ -340,6 +341,7 @@ struct drm_crtc_state { bool mode_changed : 1; bool active_changed : 1; bool connectors_changed : 1; + bool zpos_changed : 1; bool color_mgmt_changed : 1; /* attached planes bitmask: @@ -1263,6 +1265,9 @@ struct drm_connector { * plane (in 16.16) * @src_w: width of visible portion of plane (in 16.16) * @src_h: height of visible portion of plane (in 16.16) + * @zpos: priority of the given plane on crtc (optional) + * @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1 + * for given crtc * @state: backpointer to global drm_atomic_state */ struct drm_plane_state { @@ -1283,6 +1288,10 @@ struct drm_plane_state { /* Plane rotation */ unsigned int rotation; + /* Plane zpos */ + unsigned int zpos; + unsigned int normalized_zpos; + struct drm_atomic_state *state; }; @@ -1516,6 +1525,7 @@ enum drm_plane_type { * @properties: property tracking for this plane * @type: type of plane (overlay, primary, cursor) * @state: current atomic state for this plane + * @zpos_property: zpos property for this plane */ struct drm_plane { struct drm_device *dev; @@ -1546,6 +1556,8 @@ struct drm_plane { const struct drm_plane_helper_funcs *helper_private; struct drm_plane_state *state; + + struct drm_property *zpos_property; }; /** @@ -2554,6 +2566,22 @@ extern struct drm_property *drm_mode_create_rotation_property(struct drm_device extern unsigned int drm_rotation_simplify(unsigned int rotation, unsigned int supported_rotations); +int drm_plane_atomic_set_zpos_property(struct drm_plane *plane, + struct drm_plane_state *state, + struct drm_property *property, + uint64_t val); + +int drm_plane_atomic_get_zpos_property(struct drm_plane *plane, + const struct drm_plane_state *state, + struct drm_property *property, + uint64_t *val); + +int drm_plane_create_zpos_property(struct drm_plane *plane, + unsigned int min, unsigned int max); +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, + unsigned int min, + unsigned int max); + /* Helpers */ static inline struct drm_plane *drm_plane_find(struct drm_device *dev, -- 1.9.1
On Thursday 12 May 2016 15:36:07 Daniel Vetter wrote:
On Thu, May 12, 2016 at 12:28:19PM +0200, Benjamin Gaignard wrote:
From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for generic plane's zpos property property with well-defined semantics:
added zpos properties to plane and plane state structures
added helpers for normalizing zpos properties of given set of planes
well defined semantics: planes are sorted by zpos values and then plane
id value if zpos equals
Normalized zpos values are calculated automatically when generic muttable zpos property has been initialized. Drivers can simply use plane_state->normalized_zpos in their atomic_check and/or plane_update callbacks without any additional calls to DRM core.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Compare to Marek's original patch zpos property is now specific to each plane and no more to the core. Normalize function take care of the range of per plane defined range before set normalized_zpos.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org
Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Joonyoung Shim jy0922.shim@samsung.com Cc: Seung-Woo Kim sw0312.kim@samsung.com Cc: Andrzej Hajda a.hajda@samsung.com Cc: Krzysztof Kozlowski k.kozlowski@samsung.com Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Tobias Jakobi tjakobi@math.uni-bielefeld.de Cc: Gustavo Padovan gustavo@padovan.org Cc: vincent.abriou@st.com Cc: fabien.dessenne@st.com Cc: Laurent Pinchart laurent.pinchart@ideasonboard.com
When resending you must have a changelog somewhere. At elast in the cover letter, better is per-patch. Otherwise reviewers need to dig out the old threads and compare themselves.
And please update the subject as well to include the version number. You can use
$ git format-patch --cover --subject-prefix 'PATCH vX'
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