On fi-cnl-y3 we have 2 modes that differ only by crtc_clock. This means that if we request the normal mode, we automatically get the downclocked mode.

This can be seen during boot: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:101:eDP-1] probed modes : [drm:drm_mode_debug_printmodeline] Modeline 102:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:drm_mode_debug_printmodeline] Modeline 103:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa ... [drm:intel_dump_pipe_config [i915]] [CRTC:51:pipe A][modeset] [drm:intel_dump_pipe_config [i915]] output_types: EDP (0x100) [drm:intel_dump_pipe_config [i915]] cpu_transcoder: EDP, pipe bpp: 24, dithering: 0 [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] dp m2_n2: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] audio: 0, infoframes: 0 [drm:intel_dump_pipe_config [i915]] requested mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:intel_dump_pipe_config [i915]] adjusted mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa

Add a intel_edp_choose_mode helper that picks the mode.

If there is no alt mode, it always picks the default mode. If the alt mode is identical to the default mode, it picks the mode based on what mode is closest to the request clock. If the alt mode differs, it only picks the alt mode on exact match.

Testcase: kms_panel_fitting.atomic-fastset Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Fixes: dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode for eDP if available.") Cc: David Weinehall david.weinehall@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Paulo Zanoni paulo.r.zanoni@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Jim Bride jim.bride@linux.intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: stable@vger.kernel.org # v4.14+ Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105469 References: https://bugs.freedesktop.org/show_bug.cgi?id=105456 --- drivers/gpu/drm/i915/intel_dp.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 9a4a51e79fa1..075981842a7f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1671,21 +1671,25 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, return bpp; }

-static bool intel_edp_compare_alt_mode(struct drm_display_mode *m1, - struct drm_display_mode *m2) +static const struct drm_display_mode * +intel_edp_choose_mode(const struct drm_display_mode *req, + const struct drm_display_mode *def, + const struct drm_display_mode *alt) { - bool bres = false; + if (!alt) + return def;

- if (m1 && m2) - bres = (m1->hdisplay == m2->hdisplay && - m1->hsync_start == m2->hsync_start && - m1->hsync_end == m2->hsync_end && - m1->htotal == m2->htotal && - m1->vdisplay == m2->vdisplay && - m1->vsync_start == m2->vsync_start && - m1->vsync_end == m2->vsync_end && - m1->vtotal == m2->vtotal); - return bres; + if (drm_mode_equal_no_clocks(def, alt)) { + int clock; + + if (!drm_mode_equal_no_clocks(req, def)) + return def; + + clock = def->clock / 2 + alt->clock / 2; + + return req->clock > clock ? def : alt; + } else + return drm_mode_equal_no_clocks(req, alt) ? alt : def; }

bool @@ -1734,12 +1738,11 @@ intel_dp_compute_config(struct intel_encoder *encoder, pipe_config->has_audio = intel_conn_state->force_audio == HDMI_AUDIO_ON;

if (intel_dp_is_edp(intel_dp) && intel_connector->panel.fixed_mode) { - struct drm_display_mode *panel_mode = - intel_connector->panel.alt_fixed_mode; - struct drm_display_mode *req_mode = &pipe_config->base.mode; + const struct drm_display_mode *panel_mode;

- if (!intel_edp_compare_alt_mode(req_mode, panel_mode)) - panel_mode = intel_connector->panel.fixed_mode; + panel_mode = intel_edp_choose_mode(&pipe_config->base.mode, + intel_connector->panel.fixed_mode, + intel_connector->panel.alt_fixed_mode);

drm_mode_debug_printmodeline(panel_mode);

Op 13-03-18 om 15:27 schreef Ville Syrjälä:

On Tue, Mar 13, 2018 at 02:52:35PM +0100, Maarten Lankhorst wrote:

...

On fi-cnl-y3 we have 2 modes that differ only by crtc_clock. This means that if we request the normal mode, we automatically get the downclocked mode.

This can be seen during boot: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:101:eDP-1] probed modes : [drm:drm_mode_debug_printmodeline] Modeline 102:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:drm_mode_debug_printmodeline] Modeline 103:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa ... [drm:intel_dump_pipe_config [i915]] [CRTC:51:pipe A][modeset] [drm:intel_dump_pipe_config [i915]] output_types: EDP (0x100) [drm:intel_dump_pipe_config [i915]] cpu_transcoder: EDP, pipe bpp: 24, dithering: 0 [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] dp m2_n2: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] audio: 0, infoframes: 0 [drm:intel_dump_pipe_config [i915]] requested mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:intel_dump_pipe_config [i915]] adjusted mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa

Add a intel_edp_choose_mode helper that picks the mode.

If there is no alt mode, it always picks the default mode. If the alt mode is identical to the default mode, it picks the mode based on what mode is closest to the request clock. If the alt mode differs, it only picks the alt mode on exact match.

Testcase: kms_panel_fitting.atomic-fastset Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Fixes: dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode for eDP if available.") Cc: David Weinehall david.weinehall@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Paulo Zanoni paulo.r.zanoni@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Jim Bride jim.bride@linux.intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: stable@vger.kernel.org # v4.14+ Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105469 References: https://bugs.freedesktop.org/show_bug.cgi?id=105456

---

drivers/gpu/drm/i915/intel_dp.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 9a4a51e79fa1..075981842a7f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1671,21 +1671,25 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, return bpp; } -static bool intel_edp_compare_alt_mode(struct drm_display_mode *m1,

• 		       struct drm_display_mode *m2)
  

+static const struct drm_display_mode * +intel_edp_choose_mode(const struct drm_display_mode *req,

•       const struct drm_display_mode *def,
  

•       const struct drm_display_mode *alt)
  

{

• bool bres = false;

• if (!alt)

• return def;
  

• if (m1 && m2)

• bres = (m1->hdisplay == m2->hdisplay &&
  

• 	m1->hsync_start == m2->hsync_start &&
  

• 	m1->hsync_end == m2->hsync_end &&
  

• 	m1->htotal == m2->htotal &&
  

• 	m1->vdisplay == m2->vdisplay &&
  

• 	m1->vsync_start == m2->vsync_start &&
  

• 	m1->vsync_end == m2->vsync_end &&
  

• 	m1->vtotal == m2->vtotal);
  

• return bres;

• if (drm_mode_equal_no_clocks(def, alt)) {

• int clock;
  

• if (!drm_mode_equal_no_clocks(req, def))
  

• 	return def;
  

• clock = def->clock / 2 + alt->clock / 2;
  

• return req->clock > clock ? def : alt;
  

• } else

• return drm_mode_equal_no_clocks(req, alt) ? alt : def;
  

Seems a bit convoluted to me.

return user_mode->vrefresh > alt_mode->vrefresh ? fixed_mode : alt_mode;

maybe?

Though we don't seem to try very hard to make vrefresh accurate so not 100% this is going to work perfectly.

I guess we could go with the "pick the closest" vrefresh approach instead. I'm thinking we should actually be rejecting the user mode entirely if it isn't closeto either refresh rate.

There's no guarantee vrefresh is set to something sane, afaik. I don't think we can use it. If it was always set, then maybe. But I think nothing prevents it from being garbage.

~Maarten

On 03/13/2018 06:11 AM, Ville Syrjälä wrote:

On Tue, Mar 13, 2018 at 10:28:55AM +0100, Maarten Lankhorst wrote:

...

On fi-cnl-y3 we have 2 modes that differ only by crtc_clock. This means that if we request the normal mode, we automatically get the downclocked mode.

This can be seen during boot: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:101:eDP-1] probed modes : [drm:drm_mode_debug_printmodeline] Modeline 102:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:drm_mode_debug_printmodeline] Modeline 103:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa ... [drm:intel_dump_pipe_config [i915]] [CRTC:51:pipe A][modeset] [drm:intel_dump_pipe_config [i915]] output_types: EDP (0x100) [drm:intel_dump_pipe_config [i915]] cpu_transcoder: EDP, pipe bpp: 24, dithering: 0 [drm:intel_dump_pipe_config [i915]] dp m_n: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] dp m2_n2: lanes: 4; gmch_m: 4970250, gmch_n: 8388608, link_m: 828375, link_n: 1048576, tu: 64 [drm:intel_dump_pipe_config [i915]] audio: 0, infoframes: 0 [drm:intel_dump_pipe_config [i915]] requested mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa [drm:intel_dump_pipe_config [i915]] adjusted mode: [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa

Testcase: kms_panel_fitting.atomic-fastset Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Fixes: dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode for eDP if available.") Cc: David Weinehall david.weinehall@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Paulo Zanoni paulo.r.zanoni@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Jim Bride jim.bride@linux.intel.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: stable@vger.kernel.org # v4.14+

---

drivers/gpu/drm/i915/intel_dp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 9a4a51e79fa1..0bd3cc1c82b4 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1684,7 +1684,8 @@ static bool intel_edp_compare_alt_mode(struct drm_display_mode *m1, m1->vdisplay == m2->vdisplay && m1->vsync_start == m2->vsync_start && m1->vsync_end == m2->vsync_end &&

• 	m1->vtotal == m2->vtotal);
  

• 	m1->vtotal == m2->vtotal &&
  

• 	m1->clock == m2->clock);
  

Isn't the entire point here to ignore differences in the clock? Hmm. Maybe not.

For DRRS we want to ignore the slower clock. However this function is just for PSR testing when the eDP fixed mode blanking interval is shorter then the single frame setup time minimum.

Probably what we really want to do is check whether the requested refresh rate is closer to the fixed mode or the alt mode.

Since this feature appears to be for testing only the Alt mode should only be used if specifically requested. If not eDP fixed mode should be used.

Maarten, Sorry about submitting this patch again. I didn't do 5 minutes of research to see if someone already submitted a fix.

-Clint

...

return bres; } -- 2.16.2

---

Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx