Commit 627563d1 authored by Russell King's avatar Russell King
Browse files

drm/edid: add function to help find SADs 



Add a function to find the start of the SADs in the ELD.  This
complements the helper to retrieve the SAD count.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 9203dd01

include/drm/drm_edid.h

+19 −0
Original line number Diff line number Diff line
@@ -347,6 +347,25 @@ static inline int drm_eld_mnl(const uint8_t *eld) 
	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;

}



/**

 * drm_eld_sad - Get ELD SAD structures.

 * @eld: pointer to an eld memory structure with sad_count set

 */

static inline const uint8_t *drm_eld_sad(const uint8_t *eld)

{

	unsigned int ver, mnl;



	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;

	if (ver != 2 && ver != 31)

		return NULL;



	mnl = drm_eld_mnl(eld);

	if (mnl > 16)

		return NULL;



	return eld + DRM_ELD_CEA_SAD(mnl, 0);

}



/**

 * drm_eld_sad_count - Get ELD SAD count.

 * @eld: pointer to an eld memory structure with sad_count set