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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-03-28 18:13:52 +0000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2015-08-20 09:46:08 +1000 |
| commit | 1c73d3b10e6976919ce3caa5110e05e04326a7ec (patch) | |
| tree | 3a228a14a7e3f565a1f0b70c99ca5f713a5aa66a | |
| parent | 82bd279d0b2ed538cd932978ffd7ec33587313f2 (diff) | |
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>
| -rw-r--r-- | include/drm/drm_edid.h | 19 |
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 */ |