drm/tegra: dp: Read fast training capability from link

While probing the DisplayPort link, query the fast training capability.
If supported, drivers can use the fast link training sequence instead of
the more involved full link training sequence.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index f9234f66062dfda34cc3c6352b08ddcc364f2cec..97fc0225483fee2fd628ad38b90d89f25ef3801f 100644 (file)
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -11,12 +11,14 @@
 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)
@@ -61,6 +63,7 @@ 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.fast_training = drm_dp_fast_training_cap(dpcd);
 
        link->rate = link->max_rate;
        link->lanes = link->max_lanes;

diff --git a/drivers/gpu/drm/tegra/dp.h b/drivers/gpu/drm/tegra/dp.h
index 6246f9afb5fe74fa86f2da959e70c18e7546cafe..d6ae477bab5c6f951293be83ddd3a220f4a8b21b 100644 (file)
--- a/drivers/gpu/drm/tegra/dp.h
+++ b/drivers/gpu/drm/tegra/dp.h
@@ -21,6 +21,13 @@ struct drm_dp_link_caps {
         * enhanced framing capability (mandatory as of DP 1.2)
         */
        bool enhanced_framing;
+
+       /**
+        * @fast_training:
+        *
+        * AUX CH handshake not required for link training
+        */
+       bool fast_training;
 };
 
 void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,