From 687d8f66b1849a1da515bcbc791f84d7d6dcfa1c Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Fri, 1 Nov 2013 09:36:42 +1000
Subject: [PATCH] drm/nouveau/disp: log if DP link training fails
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
drivers/gpu/drm/nouveau/core/engine/disp/dport.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
index 054d9cff4f53..15448b9abac8 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 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
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 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
/* 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);
--
2.34.1