drm/amd/display: Add monitor patch for specific eDP

[WHY]
Some eDP panels's ext caps don't write initial value cause the value of
dpcd_addr(0x317) is random.  It means that sometimes the eDP will
clarify it is OLED, miniLED...etc cause the backlight control interface
is incorrect.

[HOW]
Add a new panel patch to remove sink ext caps(HDR,OLED...etc)

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Sun peng Li <sunpeng.li@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Ivan Lipski <ivlipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index c7a29bb737e24d0394e770529f1d3f43d0333aae..aac98f93545a22eb38464be4ba32ef41e4b77dfd 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -63,6 +63,12 @@ static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps)
                DRM_DEBUG_DRIVER("Disabling FAMS on monitor with panel id %X\n", panel_id);
                edid_caps->panel_patch.disable_fams = true;
                break;
+       /* Workaround for some monitors that do not clear DPCD 0x317 if FreeSync is unsupported */
+       case drm_edid_encode_panel_id('A', 'U', 'O', 0xA7AB):
+       case drm_edid_encode_panel_id('A', 'U', 'O', 0xE69B):
+               DRM_DEBUG_DRIVER("Clearing DPCD 0x317 on monitor with panel id %X\n", panel_id);
+               edid_caps->panel_patch.remove_sink_ext_caps = true;
+               break;
        default:
                return;
        }