The extension tag at offset 0 is not present in struct edid, add a
helper for it to reduce the need to use u8 *.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 82e00650af14..7c9ce5b0bd5b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1618,6 +1618,13 @@ static int edid_block_get_checksum(const void *_block)
return block->checksum;
}
+static int edid_block_tag(const void *_block)
+{
+ const u8 *block = _block;
+
+ return block[0];
+}
+
static bool drm_edid_is_zero(const u8 *in_edid, int length)
{
if (memchr_inv(in_edid, 0, length))
@@ -1710,7 +1717,7 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
*edid_corrupt = true;
/* allow CEA to slide through, switches mangle this */
- if (raw_edid[0] == CEA_EXT) {
+ if (edid_block_tag(raw_edid) == CEA_EXT) {
DRM_DEBUG("EDID checksum is invalid, remainder is %d\n", csum);
DRM_DEBUG("Assuming a KVM switch modified the CEA block but left the original checksum\n");
} else {
@@ -1722,7 +1729,7 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
}
/* per-block-type checks */
- switch (raw_edid[0]) {
+ switch (edid_block_tag(raw_edid)) {
case 0: /* base */
if (edid->version != 1) {
DRM_NOTE("EDID has major version %d, instead of 1\n", edid->version);
@@ -3366,7 +3373,7 @@ const u8 *drm_find_edid_extension(const struct edid *edid,
/* Find CEA extension */
for (i = *ext_index; i < edid->extensions; i++) {
edid_ext = (const u8 *)edid + EDID_LENGTH * (i + 1);
- if (edid_ext[0] == ext_id)
+ if (edid_block_tag(edid_ext) == ext_id)
break;
}
--
2.30.2
