drm/edid: take HF-EEODB extension count into account

Take the HF-EEODB extension count override into account.

Signed-off-by: Jani Nikula <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/c31[e-mail]

drivers/gpu/drm/drm_edid.c

···
 	/* 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);