linux-kernel - [PATCH 01/17] drm/amd/display: Return if DisplayID not found in parse_amd

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Message-ID: <20260119011146.62302-2-tomasz.pakula.oficjalny@gmail.com>
Date: Mon, 19 Jan 2026 02:11:30 +0100
From: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
To: alexander.deucher@....com,
	harry.wentland@....com,
	sunpeng.li@....com
Cc: maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	siqueira@...lia.com,
	dri-devel@...ts.freedesktop.org,
	amd-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	tomasz.pakula.oficjalny@...il.com,
	bernhard.berger@...il.com
Subject: [PATCH 01/17] drm/amd/display: Return if DisplayID not found in parse_amd_vsdb()

[Why]
The function would continue to try to parse EDID even if DisplayID
extension block wasn't found. Sometimes it got lucky and found AMD vsdb
in CEA extension block which made debugging harder.

[How]
Add a return if DisplayID extension block wasn't found

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 655c9fcb078a..a0d23853b8fc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -13113,6 +13113,9 @@ static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
 			break;
 	}
 
+	if (i == edid->extensions)
+		return false;
+
 	while (j < EDID_LENGTH - sizeof(struct amd_vsdb_block)) {
 		struct amd_vsdb_block *amd_vsdb = (struct amd_vsdb_block *)&edid_ext[j];
 		unsigned int ieeeId = (amd_vsdb->ieee_id[2] << 16) | (amd_vsdb->ieee_id[1] << 8) | (amd_vsdb->ieee_id[0]);
-- 
2.52.0