drm/tegra: dp: Add drm_dp_link_reset() implementation

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>

diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index 50ba967ebcbd4bbfa82cac787fd9324ed4829d03..c19060b8753a939a14be09abcea54b82d0ac1ed9 100644 (file)
--- 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)