From c4a27288520d35e7e6acc6e36fba4585e1bddde6 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Tue, 7 Jul 2015 21:14:12 +0200
Subject: drm/tegra: dp: Enable alternate scrambler reset when supported
Git-commit: c4a27288520d35e7e6acc6e36fba4585e1bddde6
Patch-mainline: v5.5-rc1
References: bsc#1152472
If the sink is eDP and supports the alternate scrambler reset, enable
it.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/tegra/dp.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index ca287b50fad8..638081b568f4 100644
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -225,5 +225,12 @@ 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;
}
--
2.28.0