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

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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>
This commit is contained in:
Thierry Reding 2015-12-03 13:07:43 +01:00
parent 480770440a
commit cb072eebfa
2 changed files with 10 additions and 0 deletions
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3
drivers/gpu/drm/tegra/dp.c
View File

@ -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;

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

@ -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,