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drm/amd/display: Skip PHY SSC reduction on some 8K panels

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[Why]
Some 8K displays cannot tolerate the reduced phy ssc value
at high link utilization and show corruption or black screen.

[How]
Add an EDID panel-id quirk to utilize existing skip_phy_ssc_reduction flag.

To pass the link into the quirk handler, change the signature of
apply_edid_quirks() to take link as an argument. The dev local in
dm_helpers_parse_edid_caps() becomes unused and is removed.

Fixes: 5fa62c87cf ("drm/amd/display: Add option to disable PHY SSC reduction on transmitter enable")
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 144169e7be0831e09958a906d08d1856751aa6c6)
This commit is contained in:
Roman Li
2026-05-20 16:50:34 -04:00
committed by Alex Deucher
parent b29aaf0a72
commit fe7945d092
1 changed files with 10 additions and 3 deletions
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13
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
View File

@@ -95,8 +95,11 @@ static u32 edid_extract_panel_id(struct edid *edid)
(u32)EDID_PRODUCT_ID(edid);
}
static void apply_edid_quirks(struct drm_device *dev, struct edid *edid, struct dc_edid_caps *edid_caps)
static void apply_edid_quirks(struct dc_link *link, struct edid *edid,
struct dc_edid_caps *edid_caps)
{
struct amdgpu_dm_connector *aconnector = link->priv;
struct drm_device *dev = aconnector->base.dev;
uint32_t panel_id = edid_extract_panel_id(edid);
switch (panel_id) {
@@ -126,6 +129,11 @@ static void apply_edid_quirks(struct drm_device *dev, struct edid *edid, struct
drm_dbg_driver(dev, "Disabling VSC on monitor with panel id %X\n", panel_id);
edid_caps->panel_patch.disable_colorimetry = true;
break;
/* Workaround for monitors that get corrupted by the PHY SSC reduction */
case drm_edid_encode_panel_id('D', 'E', 'L', 0x4147):
drm_dbg_driver(dev, "Skip PHY SSC reduction on panel id %X\n", panel_id);
link->wa_flags.skip_phy_ssc_reduction = true;
break;
default:
return;
}
@@ -147,7 +155,6 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
{
struct amdgpu_dm_connector *aconnector = link->priv;
struct drm_connector *connector = &aconnector->base;
struct drm_device *dev = connector->dev;
struct edid *edid_buf = edid ? (struct edid *) edid->raw_edid : NULL;
struct cea_sad *sads;
int sad_count = -1;
@@ -188,7 +195,7 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
edid_caps->frl_dsc_max_frl_rate, edid_caps->frl_dsc_total_chunk_kbytes);
}
apply_edid_quirks(dev, edid_buf, edid_caps);
apply_edid_quirks(link, edid_buf, edid_caps);
sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
if (sad_count <= 0)