From: Thierry Reding <treding@xxxxxxxxxx>
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@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/dp.c | 3 +++
drivers/gpu/drm/tegra/dp.h | 7 +++++++
2 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index f9234f66062d..97fc0225483f 100644
--- 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 6246f9afb5fe..d6ae477bab5c 100644
--- 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,
--
2.23.0
