From: Thierry Reding <treding@nvidia.com>
Date: Tue, 7 Jul 2015 19:14:12 +0000 (+0200)
Subject: drm/tegra: dp: Enable alternate scrambler reset when supported
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c4a27288520d35e7e6acc6e36fba4585e1bddde6;p=linux.git

drm/tegra: dp: Enable alternate scrambler reset when supported

If the sink is eDP and supports the alternate scrambler reset, enable
it.

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 ca287b50fad80..638081b568f43 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;
 }