From: jsg <jsg@openbsd.org>
Date: Wed, 26 Jul 2023 06:37:05 +0000 (+0000)
Subject: drm/amd/display: Add monitor specific edid quirk
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=aa2036a9c766de4381efc65232571268be89e4f7;p=openbsd

drm/amd/display: Add monitor specific edid quirk

From Aurabindo Pillai
8404d0e274ac1f780e29fa6380ad4e2f9c4bd3da in linux-6.1.y/6.1.40
613a7956deb3b1ffa2810c6d4c90ee9c3d743dbb in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index e321531502b..9933a30cc69 100644
--- a/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -42,6 +42,30 @@
 #include "dm_helpers.h"
 #include "ddc_service_types.h"
 
+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
@@ -113,6 +137,8 @@ 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);