From: Hamza Mahfooz <[email protected]> [ Upstream commit aa193f7eff8ff753577351140b8af13b76cdc7c2 ]
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 <[email protected]> Reviewed-by: Harry Wentland <[email protected]> Signed-off-by: Hamza Mahfooz <[email protected]> Signed-off-by: Alex Deucher <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/gpu/drm/drm_edid.c | 12 ++++++++++++ include/drm/drm_connector.h | 6 ++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 4005dab6147d..b36abfa91581 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -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), @@ -6166,6 +6174,7 @@ 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, @@ -6252,6 +6261,9 @@ static u32 update_display_info(struct drm_connector *connector, info->non_desktop = true; } + if (quirks & EDID_QUIRK_CAP_DSC_15BPP) + info->max_dsc_bpp = 15; + return quirks; } diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 56aee949c6fa..4d830fc55a3d 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -656,6 +656,12 @@ 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, -- 2.35.1
