On Thu, Nov 2, 2023 at 3:00 PM Hamza Mahfooz hamza.mahfooz@amd.com wrote:
On 11/1/23 17:36, Alex Deucher wrote:
On Wed, Nov 1, 2023 at 5:01 PM Hamza Mahfooz hamza.mahfooz@amd.com wrote:
Without this fix the 5120x1440@240 timing of these monitors leads to screen flickering.
Cc: stable@vger.kernel.org # 6.1+ Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1442 Co-developed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Hamza Mahfooz hamza.mahfooz@amd.com
drivers/gpu/drm/drm_edid.c | 47 +++++++++++++++++++++++++++++++++++--- 1 file changed, 44 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index bca2af4fe1fc..3fdb8907f66b 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -89,6 +89,8 @@ static int oui(u8 first, u8 second, u8 third) #define EDID_QUIRK_NON_DESKTOP (1 << 12) /* Cap the DSC target bitrate to 15bpp */ #define EDID_QUIRK_CAP_DSC_15BPP (1 << 13) +/* Fix up a particular 5120x1440@240Hz timing */ +#define EDID_QUIRK_FIXUP_5120_1440_240 (1 << 14)
What is wrong with the original timing that needs to be fixed?
Apparently, all of timing values for the 5120x1440@240 mode of these monitors aren't set correctly (they are all lower than they should be) in their EDIDs. For what it's worth, the windows driver has had a quirk similar the one proposed in this patch for ~2 years.
It would be good to at least include the original mode timings from the EDID and the new ones added by the quirk in the commit message and a description of why they are problematic and why the new ones work.
Alex
Alex
#define MICROSOFT_IEEE_OUI 0xca125c
@@ -170,6 +172,12 @@ static const struct edid_quirk { EDID_QUIRK('S', 'A', 'M', 596, EDID_QUIRK_PREFER_LARGE_60), EDID_QUIRK('S', 'A', 'M', 638, EDID_QUIRK_PREFER_LARGE_60),
/* Samsung C49G95T */EDID_QUIRK('S', 'A', 'M', 0x7053, EDID_QUIRK_FIXUP_5120_1440_240),/* Samsung S49AG95 */EDID_QUIRK('S', 'A', 'M', 0x71ac, EDID_QUIRK_FIXUP_5120_1440_240),/* Sony PVM-2541A does up to 12 bpc, but only reports max 8 bpc */ EDID_QUIRK('S', 'N', 'Y', 0x2541, EDID_QUIRK_FORCE_12BPC),@@ -6586,7 +6594,37 @@ static void update_display_info(struct drm_connector *connector, drm_edid_to_eld(connector, drm_edid); }
-static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *dev, +static void drm_mode_displayid_detailed_edid_quirks(struct drm_connector *connector,
struct drm_display_mode *mode)+{
unsigned int hsync_width;unsigned int vsync_width;if (connector->display_info.quirks & EDID_QUIRK_FIXUP_5120_1440_240) {if (mode->hdisplay == 5120 && mode->vdisplay == 1440 &&mode->clock == 1939490) {hsync_width = mode->hsync_end - mode->hsync_start;vsync_width = mode->vsync_end - mode->vsync_start;mode->clock = 2018490;mode->hdisplay = 5120;mode->hsync_start = 5120 + 8;mode->hsync_end = 5120 + 8 + hsync_width;mode->htotal = 5200;mode->vdisplay = 1440;mode->vsync_start = 1440 + 165;mode->vsync_end = 1440 + 165 + vsync_width;mode->vtotal = 1619;drm_dbg_kms(connector->dev,"[CONNECTOR:%d:%s] Samsung 240Hz mode quirk applied\n",connector->base.id, connector->name);}}+}
+static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_connector *connector, struct displayid_detailed_timings_1 *timings, bool type_7) { @@ -6605,7 +6643,7 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d bool hsync_positive = (timings->hsync[1] >> 7) & 0x1; bool vsync_positive = (timings->vsync[1] >> 7) & 0x1;
mode = drm_mode_create(dev);
mode = drm_mode_create(connector->dev); if (!mode) return NULL;@@ -6628,6 +6666,9 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d
if (timings->flags & 0x80) mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_displayid_detailed_edid_quirks(connector, mode);drm_mode_set_name(mode); return mode;@@ -6650,7 +6691,7 @@ static int add_displayid_detailed_1_modes(struct drm_connector *connector, for (i = 0; i < num_timings; i++) { struct displayid_detailed_timings_1 *timings = &det->timings[i];
newmode = drm_mode_displayid_detailed(connector->dev, timings, type_7);
newmode = drm_mode_displayid_detailed(connector, timings, type_7); if (!newmode) continue;-- 2.42.0
-- Hamza