From: Thierry Reding treding@nvidia.com
Add a helper that checks for the fast training capability given the DPCD receiver capabilities blob.
Reviewed-by: Lyude Paul lyude@redhat.com Signed-off-by: Thierry Reding treding@nvidia.com --- include/drm/drm_dp_helper.h | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index e0e76f7634a9..1179d3f2ba7c 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1215,6 +1215,13 @@ drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP); }
+static inline bool +drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + return dpcd[DP_DPCD_REV] >= 0x11 && + (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING); +} + static inline bool drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) {