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drm/edid: add a quirk for two LG monitors to get them to work on 10bpc 

[ Upstream commit aa193f7eff ]

The LG 27GP950 and LG 27GN950 have visible display corruption when
trying to use 10bpc modes. So, to fix this, cap their maximum DSC
target bitrate to 15bpp.

Suggested-by: Roman Li <roman.li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hamza Mahfooz 2022-10-21 16:37:34 -04:00 committed by Greg Kroah-Hartman
parent 6cb3666d42
commit 5221f046d9
2 changed files with 18 additions and 0 deletions
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12
drivers/gpu/drm/drm_edid.c
View File

@ -87,6 +87,8 @@ static int oui(u8 first, u8 second, u8 third)
#define EDID_QUIRK_FORCE_10BPC (1 << 11)
/* Non desktop display (i.e. HMD) */
#define EDID_QUIRK_NON_DESKTOP (1 << 12)
/* Cap the DSC target bitrate to 15bpp */
#define EDID_QUIRK_CAP_DSC_15BPP (1 << 13)
#define MICROSOFT_IEEE_OUI 0xca125c
@ -147,6 +149,12 @@ static const struct edid_quirk {
EDID_QUIRK('F', 'C', 'M', 13600, EDID_QUIRK_PREFER_LARGE_75 |
EDID_QUIRK_DETAILED_IN_CM),
/* LG 27GP950 */
EDID_QUIRK('G', 'S', 'M', 0x5bbf, EDID_QUIRK_CAP_DSC_15BPP),
/* LG 27GN950 */
EDID_QUIRK('G', 'S', 'M', 0x5b9a, EDID_QUIRK_CAP_DSC_15BPP),
/* LGD panel of HP zBook 17 G2, eDP 10 bpc, but reports unknown bpc */
EDID_QUIRK('L', 'G', 'D', 764, EDID_QUIRK_FORCE_10BPC),
@ -6116,6 +6124,7 @@ static void drm_reset_display_info(struct drm_connector *connector)
info->mso_stream_count = 0;
info->mso_pixel_overlap = 0;
info->max_dsc_bpp = 0;
}
static u32 update_display_info(struct drm_connector *connector,
@ -6202,6 +6211,9 @@ out:
info->non_desktop = true;
}
if (quirks & EDID_QUIRK_CAP_DSC_15BPP)
info->max_dsc_bpp = 15;
return quirks;
}

6
include/drm/drm_connector.h
View File

@ -635,6 +635,12 @@ struct drm_display_info {
* @mso_pixel_overlap: eDP MSO segment pixel overlap, 0-8 pixels.
*/
u8 mso_pixel_overlap;
/**
* @max_dsc_bpp: Maximum DSC target bitrate, if it is set to 0 the
* monitor's default value is used instead.
*/
u32 max_dsc_bpp;
};
int drm_display_info_set_bus_formats(struct drm_display_info *info,