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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-03-28 18:13:52 +0000
committerDave Airlie <airlied@redhat.com>2015-08-20 09:46:08 +1000
commit1c73d3b10e6976919ce3caa5110e05e04326a7ec (patch)
tree3a228a14a7e3f565a1f0b70c99ca5f713a5aa66a /include/drm
parent82bd279d0b2ed538cd932978ffd7ec33587313f2 (diff)
downloadlinux-linaro-stable-1c73d3b10e6976919ce3caa5110e05e04326a7ec.tar.gz
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>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_edid.h19
1 files changed, 19 insertions, 0 deletions
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
*/