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Subject[PATCH AUTOSEL 6.1 14/85] drm/edid: add a quirk for two LG monitors to get them to work on 10bpc
Date
From: Hamza Mahfooz <hamza.mahfooz@amd.com>

[ 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 <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>
---
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
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