[07/32] drm/tegra: dp: Read TPS3 capability from sink

Commit Message

Thierry Reding Oct. 24, 2019, 4:45 p.m. UTC

From: Thierry Reding <[e-mail]>

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 <[e-mail]>
---
 drivers/gpu/drm/tegra/dp.c | 3 +++
 drivers/gpu/drm/tegra/dp.h | 7 +++++++
 2 files changed, 10 insertions(+)

Patch

diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index 97fc0225483f..e22ebab677b9 100644
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -11,6 +11,7 @@ 
 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;
 }
 
@@ -18,6 +19,7 @@  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;
 }
 
@@ -63,6 +65,7 @@  int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
 	link->max_lanes = drm_dp_max_lane_count(dpcd);
 
 	link->caps.enhanced_framing = drm_dp_enhanced_frame_cap(dpcd);
+	link->caps.tps3_supported = drm_dp_tps3_supported(dpcd);
 	link->caps.fast_training = drm_dp_fast_training_cap(dpcd);
 
 	link->rate = link->max_rate;
diff --git a/drivers/gpu/drm/tegra/dp.h b/drivers/gpu/drm/tegra/dp.h
index d6ae477bab5c..999078812943 100644
--- a/drivers/gpu/drm/tegra/dp.h
+++ b/drivers/gpu/drm/tegra/dp.h
@@ -22,6 +22,13 @@  struct drm_dp_link_caps {
 	 */
 	bool enhanced_framing;
 
+	/**
+	 * tps3_supported:
+	 *
+	 * training pattern sequence 3 supported for equalization
+	 */
+	bool tps3_supported;
+
 	/**
 	 * @fast_training:
 	 *