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.

[airlied: this fixes a build problem with the alsa eld helper
which required this].

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 799050198323e852c7cbb45e3c1236cc67d386ac..53c53c459b15c8207997da61234d0ab9ea2805ae 100644 (file)
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -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