[PATCH 06/12] drm/dp: Read TPS3 capability from sink

[Thierry Reding]

From: Thierry Reding <tred...@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 at nvidia.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 3 +++
 include/drm/drm_dp_helper.h     | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 0211502f63af..2c774ffa2943 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -303,6 +303,7 @@ 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;
 }

@@ -310,6 +311,7 @@ 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;
 }

@@ -355,6 +357,7 @@ 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 a01ae89cee9c..bf280a4230fa 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -764,6 +764,7 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
  */
 struct drm_dp_link_caps {
        bool enhanced_framing;
+       bool tps3_supported;
        bool fast_training;
 };

-- 
2.5.0