From: Thierry Reding <treding@xxxxxxxxxx>
If the sink is eDP and supports the alternate scrambler reset, enable
it.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_helper.c | 11 +++++++++++
include/drm/drm_dp_helper.h | 1 +
2 files changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index e3a289793c73..76ac68bc1042 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -316,6 +316,7 @@ 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,
@@ -325,6 +326,7 @@ 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)
@@ -378,6 +380,8 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
static const u8 edp_revs[] = { 0x11, 0x12, 0x13, 0x14 };
u8 value;
+ link->caps.alternate_scrambler_reset = true;
+
err = drm_dp_dpcd_readb(aux, DP_EDP_DPCD_REV, &value);
if (err < 0)
return err;
@@ -493,6 +497,13 @@ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link)
if (err < 0)
return err;
+ if (link->caps.alternate_scrambler_reset) {
+ err = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET,
+ DP_ALTERNATE_SCRAMBLER_RESET_ENABLE);
+ if (err < 0)
+ return err;
+ }
+
return 0;
}
EXPORT_SYMBOL(drm_dp_link_configure);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 2efa6539c783..825aaf4e8c71 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -793,6 +793,7 @@ struct drm_dp_link_caps {
bool tps3_supported;
bool fast_training;
bool channel_coding;
+ bool alternate_scrambler_reset;
};
void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,
--
2.5.0
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