drm/dp: add helper for checking DP_ENHANCED_FRAME_CAP in DPCD

Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
mariux64 · Oct 9, 2013 · 58704e6 · 58704e6
1 parent 0111be4
commit 58704e6
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
@@ -390,4 +390,11 @@ drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 	return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 }
 
+static inline bool
+drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+	return dpcd[DP_DPCD_REV] >= 0x11 &&
+		(dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);
+}
+
 #endif /* _DRM_DP_HELPER_H_ */