mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm: bridge: dw_hdmi: fix preference of RGB modes over YUV420 

[ Upstream commit d3d6b1bf85 ]

Cheap monitors sometimes advertise YUV modes they don't really have
(HDMI specification mandates YUV support so even monitors without actual
support will often wrongfully advertise it) which results in YUV matches
and user forum complaints of a red tint to light colour display areas in
common desktop environments.

Moving the default RGB fall-back before YUV selection results in RGB
mode matching in most cases, reducing complaints.

Fixes: 6c3c719936 ("drm/bridge: synopsys: dw-hdmi: add bus format negociation")
Signed-off-by: Guillaume BRUN <the.cheaterman@gmail.com>
Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221116143523.2126-1-the.cheaterman@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guillaume BRUN 2022-11-16 15:35:23 +01:00 committed by Greg Kroah-Hartman
parent 0e4763798c
commit 52f5219f48
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
View File

@ -2720,6 +2720,9 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
* if supported. In any case the default RGB888 format is added
*/
/* Default 8bit RGB fallback */
output_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
if (max_bpc >= 16 && info->bpc == 16) {
if (info->color_formats & DRM_COLOR_FORMAT_YCBCR444)
output_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48;
@ -2753,9 +2756,6 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
if (info->color_formats & DRM_COLOR_FORMAT_YCBCR444)
output_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
/* Default 8bit RGB fallback */
output_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
*num_output_fmts = i;
return output_fmts;