[PATCH 08/21] drm/dp: Read TPS3 capability from sink

[Thierry Reding]

From: Thierry Reding <treding at 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     | 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 74e4fceace7e..c47d78973c1e 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -355,6 +355,7 @@ 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;
 }
 
@@ -362,6 +363,7 @@ 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);
@@ -408,6 +410,7 @@ 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 c148f5685195..ab98ebb302a9 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1369,10 +1369,12 @@ 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;
 };
 
-- 
2.22.0