drm/tegra: dp: Read alternate scrambler reset capability from sink

Parse from the sink capabilities whether or not the eDP alternate
scrambler reset value of 0xfffe is supported.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index 0bd87cff4575329271e75ec4af7fa846d34fe13d..1f48c2190e3b5c64d357edaefc498ff64eaccf85 100644 (file)
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -14,6 +14,7 @@ static void drm_dp_link_caps_reset(struct drm_dp_link_caps *caps)
        caps->tps3_supported = false;
        caps->fast_training = false;
        caps->channel_coding = false;
+       caps->alternate_scrambler_reset = false;
 }
 
 void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,
@@ -23,6 +24,7 @@ void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,
        dest->tps3_supported = src->tps3_supported;
        dest->fast_training = src->fast_training;
        dest->channel_coding = src->channel_coding;
+       dest->alternate_scrambler_reset = src->alternate_scrambler_reset;
 }
 
 static void drm_dp_link_reset(struct drm_dp_link *link)
@@ -71,6 +73,9 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
        link->caps.fast_training = drm_dp_fast_training_cap(dpcd);
        link->caps.channel_coding = drm_dp_channel_coding_supported(dpcd);
 
+       if (drm_dp_alternate_scrambler_reset_cap(dpcd))
+               link->caps.alternate_scrambler_reset = true;
+
        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 984dac21568e92adccbbee6f95fe179c1f16dcb9..45e8ff18ab6ab6a1cad497fc52cc54e410f97244 100644 (file)
--- a/drivers/gpu/drm/tegra/dp.h
+++ b/drivers/gpu/drm/tegra/dp.h
@@ -42,6 +42,13 @@ struct drm_dp_link_caps {
         * ANSI 8B/10B channel coding capability
         */
        bool channel_coding;
+
+       /**
+        * @alternate_scrambler_reset:
+        *
+        * eDP alternate scrambler reset capability
+        */
+       bool alternate_scrambler_reset;
 };
 
 void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,