From: Thierry Reding treding@nvidia.com
The TPS3 capability can be exposed by DP 1.2 and later sinks if they support the alternative training pattern for channel equalization.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_dp_helper.c | 3 +++ include/drm/drm_dp_helper.h | 2 ++ 2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 2d56aeda1b75..664d814ab250 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -334,6 +334,7 @@ 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->tps3_supported = false; caps->fast_training = false; }
@@ -341,6 +342,7 @@ 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->tps3_supported = src->tps3_supported; dest->fast_training = src->fast_training; } EXPORT_SYMBOL(drm_dp_link_caps_copy); @@ -387,6 +389,7 @@ 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.tps3_supported = drm_dp_tps3_supported(values); link->caps.fast_training = drm_dp_fast_training_cap(values);
link->rate = link->max_rate; diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 680d6719d463..81af618c6b4a 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1110,10 +1110,12 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, /** * struct drm_dp_link_caps - DP link capabilities * @enhanced_framing: enhanced framing capability (mandatory as of DP 1.2) + * @tps3_supported: training pattern sequence 3 supported for equalization * @fast_training: AUX CH handshake not required for link training */ struct drm_dp_link_caps { bool enhanced_framing; + bool tps3_supported; bool fast_training; };