From 1abd6b3304d47ff055063e0d59fc03bb27e0e196 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Thu, 3 Dec 2015 11:44:17 +0100
Subject: drm/tegra: dp: Add drm_dp_link_reset() implementation
Git-commit: 1abd6b3304d47ff055063e0d59fc03bb27e0e196
Patch-mainline: v5.5-rc1
References: bsc#1152472

Subsequent patches will add non-volatile fields to struct drm_dp_link,
so introduce a function to zero out only the volatile fields.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/tegra/dp.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index 50ba967ebcbd..c19060b8753a 100644
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -8,6 +8,17 @@
 
 #include "dp.h"
 
+static void drm_dp_link_reset(struct drm_dp_link *link)
+{
+	if (!link)
+		return;
+
+	link->revision = 0;
+	link->rate = 0;
+	link->num_lanes = 0;
+	link->capabilities = 0;
+}
+
 /**
  * drm_dp_link_probe() - probe a DisplayPort link for capabilities
  * @aux: DisplayPort AUX channel
@@ -24,7 +35,7 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)
 	u8 values[3];
 	int err;
 
-	memset(link, 0, sizeof(*link));
+	drm_dp_link_reset(link);
 
 	err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values));
 	if (err < 0)
-- 
2.28.0