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drm/tegra: dp: Read TPS3 capability from sink

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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@nvidia.com>
This commit is contained in:
Thierry Reding 2015-07-07 20:52:07 +02:00
parent cb072eebfa
commit db199502fa
2 changed files with 10 additions and 0 deletions
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3
drivers/gpu/drm/tegra/dp.c
View File

@ -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;

7
drivers/gpu/drm/tegra/dp.h
View File

@ -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:
*