@@ -303,12 +303,14 @@ EXPORT_SYMBOL(drm_dp_dpcd_read_link_status);
static void drm_dp_link_caps_reset(struct drm_dp_link_caps *caps)
{
caps->enhanced_framing = false;
+ caps->fast_training = false;
}
void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,
const struct drm_dp_link_caps *src)
{
dest->enhanced_framing = src->enhanced_framing;
+ dest->fast_training = src->fast_training;
}
static void drm_dp_link_reset(struct drm_dp_link *link)
@@ -353,6 +355,7 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
link->max_lanes = drm_dp_max_lane_count(values);
link->caps.enhanced_framing = drm_dp_enhanced_frame_cap(values);
+ link->caps.fast_training = drm_dp_fast_training_cap(values);
link->rate = link->max_rate;
link->lanes = link->max_lanes;
@@ -645,6 +645,13 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
}
+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);
+}
+
/*
* DisplayPort AUX channel
*/
@@ -757,6 +764,7 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
*/
struct drm_dp_link_caps {
bool enhanced_framing;
+ bool fast_training;
};
void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,