diff mbox series

[CI,v3,08/12] drm/edid: use EDID block read helper in drm_do_get_edid()

Message ID 3bcf98453770757ee93386da0cfbc6552d42a312.1649685475.git.jani.nikula@intel.com (mailing list archive)
State New, archived
Headers show
Series drm/edid: low level EDID block read refactoring etc. | expand

Commit Message

Jani Nikula April 11, 2022, 2 p.m. UTC 
Convert drm_do_get_edit() from the base block read helper to the generic
block read helper. There's quite a bit going on here, as the corrupt and
null EDID information is moved back to the caller. As we see, they were
not all that clear to begin with, and this change underlines that.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/drm_edid.c | 62 ++++++++++++++------------------------
 1 file changed, 23 insertions(+), 39 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 58be9be72dde..359d3d6f216e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2076,44 +2076,6 @@  static enum edid_block_status edid_block_read(void *block, unsigned int block_nu
 	return status;
 }
 
-static struct edid *drm_do_get_edid_base_block(struct drm_connector *connector,
-					       read_block_fn read_block,
-					       void *context)
-{
-	int *null_edid_counter = connector ? &connector->null_edid_counter : NULL;
-	bool *edid_corrupt = connector ? &connector->edid_corrupt : NULL;
-	void *edid;
-	int try;
-
-	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
-	if (edid == NULL)
-		return NULL;
-
-	/* base block fetch */
-	for (try = 0; try < 4; try++) {
-		if (read_block(context, edid, 0, EDID_LENGTH))
-			goto out;
-		if (drm_edid_block_valid(edid, 0, false, edid_corrupt))
-			break;
-		if (try == 0 && edid_block_is_zero(edid)) {
-			if (null_edid_counter)
-				(*null_edid_counter)++;
-			goto carp;
-		}
-	}
-	if (try == 4)
-		goto carp;
-
-	return edid;
-
-carp:
-	if (connector)
-		connector_bad_edid(connector, edid, 1);
-out:
-	kfree(edid);
-	return NULL;
-}
-
 /**
  * drm_do_get_edid - get EDID data using a custom EDID block read function
  * @connector: connector we're probing
@@ -2138,6 +2100,7 @@  struct edid *drm_do_get_edid(struct drm_connector *connector,
 			     read_block_fn read_block,
 			     void *context)
 {
+	enum edid_block_status status;
 	int j, invalid_blocks = 0;
 	struct edid *edid, *new, *override;
 
@@ -2145,10 +2108,31 @@  struct edid *drm_do_get_edid(struct drm_connector *connector,
 	if (override)
 		return override;
 
-	edid = drm_do_get_edid_base_block(connector, read_block, context);
+	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
 	if (!edid)
 		return NULL;
 
+	status = edid_block_read(edid, 0, read_block, context);
+
+	edid_block_status_print(status, edid, 0);
+
+	if (status == EDID_BLOCK_READ_FAIL)
+		goto out;
+
+	/* FIXME: Clarify what a corrupt EDID actually means. */
+	if (status == EDID_BLOCK_OK || status == EDID_BLOCK_VERSION)
+		connector->edid_corrupt = false;
+	else
+		connector->edid_corrupt = true;
+
+	if (!edid_block_status_valid(status, edid_block_tag(edid))) {
+		if (status == EDID_BLOCK_ZERO)
+			connector->null_edid_counter++;
+
+		connector_bad_edid(connector, edid, 1);
+		goto out;
+	}
+
 	if (edid->extensions == 0)
 		return edid;