diff options
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 30 | ||||
| -rw-r--r-- | include/drm/drm_edid.h | 1 |
2 files changed, 31 insertions, 0 deletions
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, |