[PATCH 6.18 580/752] drm/bridge: anx7625: Fix invalid EDID size

Sasha Levin
2026-02-28T17:56:32Z

From: Loic Poulain <loic.poulain@oss.qualcomm.com>

[ Upstream commit 1d5362145de96b5d00d590605cc94cdfa572b405 ]

DRM checks EDID block count against allocated size in drm_edid_valid
function. We have to allocate the right EDID size instead of the max
size to prevent the EDID to be reported as invalid.

Cc: stable@kernel.org
Fixes: 7c585f9a71aa ("drm/bridge: anx7625: use struct drm_edid more")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Link: https://patch.msgid.link/20251218151307.95491-1-loic.poulain@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 6f3fdcb6afdb9..4e49e4f28d552 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1801,7 +1801,7 @@ static const struct drm_edid *anx7625_edid_read(struct anx7625_data *ctx)
return NULL;
}

- ctx->cached_drm_edid = drm_edid_alloc(edid_buf, FOUR_BLOCK_SIZE);
+ ctx->cached_drm_edid = drm_edid_alloc(edid_buf, edid_num * ONE_BLOCK_SIZE);
kfree(edid_buf);

out:
--
2.51.0