[PATCH RFC v3 1/7] drm/edid: add function to help find SADs, DO NOT MERGE

Jyri Sarha
2015-08-14T09:31:09Z

From: Russell King - ARM Linux <linux@arm.linux.org.uk>

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: Russell King <rmk+kernel@arm.linux.org.uk>

This should already be coming in from drm-next.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
include/drm/drm_edid.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 7990501..53c53c4 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -348,6 +348,25 @@ static inline int drm_eld_mnl(const uint8_t *eld)
}

/**
+ * 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
*/
--
1.9.1