From 8cda78b1281d59ffa3032a3885e6ffc8eb79062c Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Mon, 21 Oct 2019 16:34:27 +0200 Subject: [PATCH] drm/dp: Add drm_dp_fast_training_cap() helper Add a helper that checks for the fast training capability given the DPCD receiver capabilities blob. Reviewed-by: Lyude Paul Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20191021143437.1477719-4-thierry.reding@gmail.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]) { -- 2.39.5