[PATCH 01/12] drm/dp: Add drm_dp_link_reset() implementation

[Thierry Reding <thierry.reding@gmail.com>]

From: Thierry Reding <treding@nvidia.com>

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>
---
 drivers/gpu/drm/drm_dp_helper.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 9535c5b60387..841b49652cc5 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -284,6 +284,17 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
 }
 EXPORT_SYMBOL(drm_dp_dpcd_read_link_status);
 
+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
@@ -300,7 +311,7 @@ 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)
-- 
2.5.0

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