drm/nouveau/disp: log if DP link training fails
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
index 054d9cf..15448b9 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
@@ -308,7 +308,7 @@
while (*link_bw > (dp->dpcd[1] * 27000))
link_bw++;
- while (link_bw[0]) {
+ while ((ret = -EIO) && link_bw[0]) {
/* find minimum required lane count at this link rate */
dp->link_nr = dp->dpcd[2] & DPCD_RC02_MAX_LANE_COUNT;
while ((dp->link_nr >> 1) * link_bw[0] > datarate)
@@ -339,6 +339,8 @@
/* finish link training */
dp_set_training_pattern(dp, 0);
+ if (ret < 0)
+ ERR("link training failed\n");
/* execute post-train script from vbios */
dp_link_train_fini(dp);