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| author | Jani Nikula <jani.nikula@intel.com> | 2022-10-24 15:33:36 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-10-26 09:53:17 +0300 |
| commit | 6c9b3db70aad556152cba7291e93ae9e4bb1a6b0 (patch) | |
| tree | 7847502b7a0efd6d97b18a4687f44f3e9f4c12c8 /drivers/gpu/drm/drm_edid.c | |
| parent | b16c9e6c7d91c91e97a30f69b408388726e0376d (diff) | |
| download | linux-6c9b3db70aad556152cba7291e93ae9e4bb1a6b0.tar.gz linux-6c9b3db70aad556152cba7291e93ae9e4bb1a6b0.tar.bz2 linux-6c9b3db70aad556152cba7291e93ae9e4bb1a6b0.zip | |
drm/edid: add function for checking drm_edid validity
We've lacked a function for immutable validity check on drm_edid. Add
one.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f96188f64e9f7f3deff348d08296609353b12316.1666614699.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 30 |
1 files changed, 30 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) { |