Nouveau - Jan 2019 - [PATCH] drm/nouveau: Don't WARN_ON VCPI allocation failures

This is much louder then we want. VCPI allocation failures are quite
normal, since they will happen if any part of the modesetting process is
interrupted by removing the DP MST topology in question. So just print a
debugging message on VCPI failures instead.

Signed-off-by: Lyude Paul <lyude at redhat.com>
Fixes: f479c0ba4a17 ("drm/nouveau/kms/nv50: initial support for DP 1.2
multi-stream")
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v4.10+
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c
b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 2e8a5fd9b262..09a9c747c7bb 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -811,7 +811,8 @@ nv50_msto_enable(struct drm_encoder *encoder)
 
 	slots = drm_dp_find_vcpi_slots(&mstm->mgr, mstc->pbn);
 	r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, mstc->pbn,
slots);
-	WARN_ON(!r);
+	if (!r)
+		DRM_DEBUG_KMS("Failed to allocate VCPI\n");
 
 	if (!mstm->links++)
 		nv50_outp_acquire(mstm->outp);
-- 
2.20.1

Hi,

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag,
fixing commit: f479c0ba4a17 drm/nouveau/kms/nv50: initial support for DP 1.2
multi-stream.

The bot has tested the following trees: v4.20.5, v4.19.18, v4.14.96.

v4.20.5: Build OK!
v4.19.18: Build OK!
v4.14.96: Failed to apply! Possible dependencies:
    Unable to calculate


How should we proceed with this patch?

--
Thanks,
Sasha