From: Thierry Reding treding@nvidia.com
Store the AUX read interval from DPCD, so that it can be used to wait for the durations given in the specification during link training.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_dp_helper.c | 3 +++ include/drm/drm_dp_helper.h | 1 + 2 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index c711b690508b..9d6ef0576abc 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -351,6 +351,9 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) } }
+ /* DP_TRAINING_AUX_RD_INTERVAL is in units of 4 milliseconds */ + link->aux_rd_interval = values[14] * 4000; + return 0; } EXPORT_SYMBOL(drm_dp_link_probe); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index f9e7f484a225..1fda4643af1f 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -753,6 +753,7 @@ struct drm_dp_link { unsigned int rate; unsigned int num_lanes; unsigned long capabilities; + unsigned long aux_rd_interval; };
int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);