From: Thierry Reding <treding@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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);
--
2.4.5
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