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drm/amd/display: Add monitor patch for specific eDP
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[WHY]
Some eDP panels' ext caps don't write initial values. The value of
dpcd_addr (0x317) can be random and the backlight control interface
will be incorrect.

[HOW]
Add new panel patches to remove sink ext caps.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.5.x
Cc: Tsung-hua Lin <tsung-hua.lin@amd.com>
Cc: Chris Chi <moukong.chi@amd.com>
Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ryan Lin <tsung-hua.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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tsunglinx authored and alexdeucher committed Mar 20, 2024
1 parent 7fb19d9 commit 04a59c5
Showing 1 changed file with 4 additions and 2 deletions.
6 changes: 4 additions & 2 deletions drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,8 @@ static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps)
/* 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):
case drm_edid_encode_panel_id('B', 'O', 'E', 0x092A):
case drm_edid_encode_panel_id('L', 'G', 'D', 0x06D1):
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;
Expand Down Expand Up @@ -120,6 +122,8 @@ enum dc_edid_status dm_helpers_parse_edid_caps(

edid_caps->edid_hdmi = connector->display_info.is_hdmi;

apply_edid_quirks(edid_buf, edid_caps);

sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
if (sad_count <= 0)
return result;
Expand All @@ -146,8 +150,6 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
else
edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION;

apply_edid_quirks(edid_buf, edid_caps);

kfree(sads);
kfree(sadb);

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