[PATCH v2 08/16] drm/edid: add function for checking drm_edid validity

[Jani Nikula]

We've lacked a function for immutable validity check on drm_edid. Add
one.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_edid.c | 30 ++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     |  1 +
 2 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 616c1cdc7507..c3cf942186b7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2040,6 +2040,36 @@ bool drm_edid_is_valid(struct edid *edid)
 }
 EXPORT_SYMBOL(drm_edid_is_valid);
 
+/**
+ * drm_edid_valid - sanity check EDID data
+ * @drm_edid: EDID data
+ *
+ * Sanity check an EDID. Cross check block count against allocated size and
+ * checksum the blocks.
+ *
+ * Return: True if the EDID data is valid, false otherwise.
+ */
+bool drm_edid_valid(const struct drm_edid *drm_edid)
+{
+	int i;
+
+	if (!drm_edid)
+		return false;
+
+	if (edid_size_by_blocks(__drm_edid_block_count(drm_edid)) != drm_edid->size)
+		return false;
+
+	for (i = 0; i < drm_edid_block_count(drm_edid); i++) {
+		const void *block = drm_edid_block_data(drm_edid, i);
+
+		if (!edid_block_valid(block, i == 0))
+			return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(drm_edid_valid);
+
 static struct edid *edid_filter_invalid_blocks(struct edid *edid,
 					       size_t *alloc_size)
 {
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 05380681a4fb..a2e25e7e6ee5 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -606,6 +606,7 @@ drm_display_mode_from_cea_vic(struct drm_device *dev,
 const struct drm_edid *drm_edid_alloc(const void *edid, size_t size);
 const struct drm_edid *drm_edid_dup(const struct drm_edid *drm_edid);
 void drm_edid_free(const struct drm_edid *drm_edid);
+bool drm_edid_valid(const struct drm_edid *drm_edid);
 const struct edid *drm_edid_raw(const struct drm_edid *drm_edid);
 const struct drm_edid *drm_edid_read(struct drm_connector *connector);
 const struct drm_edid *drm_edid_read_ddc(struct drm_connector *connector,
-- 
2.34.1