From 687d8f66b1849a1da515bcbc791f84d7d6dcfa1c Mon Sep 17 00:00:00 2001 From: Ben Skeggs 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 --- 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); -- 2.39.5