The patch below does not apply to the 6.8-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Thanks,
Sasha
------------------ original commit in Linus's tree ------------------
>From 04a59c54757567f19dff4571ff7338476ec0f604 Mon Sep 17 00:00:00 2001
From: Ryan Lin <tsung-hua.lin@xxxxxxx>
Date: Wed, 21 Feb 2024 19:10:27 +0800
Subject: [PATCH] drm/amd/display: Add monitor patch for specific eDP
[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@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 6.5.x
Cc: Tsung-hua Lin <tsung-hua.lin@xxxxxxx>
Cc: Chris Chi <moukong.chi@xxxxxxx>
Reviewed-by: Wayne Lin <wayne.lin@xxxxxxx>
Acked-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Ryan Lin <tsung-hua.lin@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
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 85b7f58a7f35a..c27063305a134 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -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;
@@ -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;
@@ -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);
--
2.43.0
