Commit 6c9b3db7 authored by Jani Nikula's avatar Jani Nikula
Browse files

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: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f96188f64e9f7f3deff348d08296609353b12316.1666614699.git.jani.nikula@intel.com
parent b16c9e6c

drivers/gpu/drm/drm_edid.c

+30 −0
Original line number Diff line number Diff line
@@ -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)

{

include/drm/drm_edid.h

+1 −0
Original line number Diff line number Diff line
@@ -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,