[v3,12/13] drm/edid: take HF-EEODB extension count into account

Commit Message

Jani Nikula June 22, 2022, 10:59 a.m. UTC

Take the HF-EEODB extension count override into account.

Signed-off-by: Jani Nikula <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
---
 drivers/gpu/drm/drm_edid.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fa3a3e294560..bbc25e3b7220 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1629,6 +1629,19 @@  static int drm_edid_block_count(const struct drm_edid *drm_edid)
 	/* Starting point */
 	num_blocks = edid_block_count(drm_edid->edid);
 
+	/* HF-EEODB override */
+	if (drm_edid->size >= edid_size_by_blocks(2)) {
+		int eeodb;
+
+		/*
+		 * Note: HF-EEODB may specify a smaller extension count than the
+		 * regular one. Unlike in buffer allocation, here we can use it.
+		 */
+		eeodb = edid_hfeeodb_block_count(drm_edid->edid);
+		if (eeodb)
+			num_blocks = eeodb;
+	}
+
 	/* Limit by allocated size */
 	num_blocks = min(num_blocks, (int)drm_edid->size / EDID_LENGTH);