diff mbox

[09/13] drm/edid: add function to help find SADs

Message ID E1Yr1xt-0006l4-D0@rmk-PC.arm.linux.org.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Russell King May 9, 2015, 10:26 a.m. UTC 
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>
---
 include/drm/drm_edid.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
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Patch

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 799050198323..53c53c459b15 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
  */