This is a note to let you know that I've just added the patch titled
drm/amd/display: Add monitor specific edid quirk
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-add-monitor-specific-edid-quirk.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 613a7956deb3b1ffa2810c6d4c90ee9c3d743dbb Mon Sep 17 00:00:00 2001
From: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Date: Mon, 12 Jun 2023 12:44:00 -0400
Subject: drm/amd/display: Add monitor specific edid quirk
From: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
commit 613a7956deb3b1ffa2810c6d4c90ee9c3d743dbb upstream.
Disable FAMS on a Samsung Odyssey G9 monitor. Experiments show that this
monitor does not work well under some use cases, and is likely
implementation specific bug on the monitor's firmware.
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 26 ++++++++++++++
1 file changed, 26 insertions(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -47,6 +47,30 @@
/* MST Dock */
static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA";
+static u32 edid_extract_panel_id(struct edid *edid)
+{
+ return (u32)edid->mfg_id[0] << 24 |
+ (u32)edid->mfg_id[1] << 16 |
+ (u32)EDID_PRODUCT_ID(edid);
+}
+
+static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps)
+{
+ uint32_t panel_id = edid_extract_panel_id(edid);
+
+ switch (panel_id) {
+ /* Workaround for some monitors which does not work well with FAMS */
+ case drm_edid_encode_panel_id('S', 'A', 'M', 0x0E5E):
+ case drm_edid_encode_panel_id('S', 'A', 'M', 0x7053):
+ case drm_edid_encode_panel_id('S', 'A', 'M', 0x71AC):
+ DRM_DEBUG_DRIVER("Disabling FAMS on monitor with panel id %X\n", panel_id);
+ edid_caps->panel_patch.disable_fams = true;
+ break;
+ default:
+ return;
+ }
+}
+
/* dm_helpers_parse_edid_caps
*
* Parse edid caps
@@ -118,6 +142,8 @@ enum dc_edid_status dm_helpers_parse_edi
else
edid_caps->speaker_flags = DEFAULT_SPEAKER_LOCATION;
+ apply_edid_quirks(edid_buf, edid_caps);
+
kfree(sads);
kfree(sadb);
Patches currently in stable-queue which might be from aurabindo.pillai@xxxxxxx are
queue-6.4/drm-amd-display-add-monitor-specific-edid-quirk.patch
