[PATCH RFC 07/11] drm/edid: add function to help find SADs
From: Russell King <hidden>
Date: 2015-03-30 19:40:32
Also in:
alsa-devel, dri-devel
Subsystem:
drm drivers, the rest · Maintainers:
David Airlie, Simona Vetter, Linus Torvalds
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 <redacted> --- 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 87d85e81d3a7..c44ad513e0f7 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h@@ -346,6 +346,25 @@ 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 */
--
1.8.3.1