drm/bridge: anx7625: Fix invalid EDID size

Loic Poulain · lumag · commit 1d5362145de9 · 2026-01-21T09:01:30.000+02:00
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: 7c585f9 ("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>
diff --git 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:

Original file line number	Diff line number	Diff line change
`@@ -1801,7 +1801,7 @@ static const struct drm_edid anx7625_edid_read(struct anx7625_data ctx)`
`1801`	`1801`	`return NULL;`
`1802`	`1802`	`}`
`1803`	`1803`
`1804`		`- ctx->cached_drm_edid = drm_edid_alloc(edid_buf, FOUR_BLOCK_SIZE);`
	`1804`	`+ ctx->cached_drm_edid = drm_edid_alloc(edid_buf, edid_num * ONE_BLOCK_SIZE);`
`1805`	`1805`	`kfree(edid_buf);`
`1806`	`1806`
`1807`	`1807`	`out:`