AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

drm/nouveau/drm/nouveau: Grab runtime PM ref in nv50_mstc_detect()

Browse Source 
While we currently grab a runtime PM ref in nouveau's normal connector
detection code, we apparently don't do this for MST. This means if we're
in a scenario where the GPU is suspended and userspace attempts to do a
connector probe on an MSTC connector, the probe will fail entirely due
to the DP aux channel and GPU not being woken up:

[  316.633489] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
[  316.635713] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
[  316.637785] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
...

So, grab a runtime PM ref here.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Lyude Paul 2018-09-14 16:44:03 -04:00 committed by Ben Skeggs
parent 3483f08106
commit e46368cf77
1 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/drm/nouveau/dispnv50/disp.c
View File

@ -900,9 +900,22 @@ static enum drm_connector_status
nv50_mstc_detect(struct drm_connector *connector, bool force)
{
struct nv50_mstc *mstc = nv50_mstc(connector);
enum drm_connector_status conn_status;
int ret;
if (!mstc->port)
return connector_status_disconnected;
return drm_dp_mst_detect_port(connector, mstc->port->mgr, mstc->port);
ret = pm_runtime_get_sync(connector->dev->dev);
if (ret < 0 && ret != -EACCES)
return connector_status_disconnected;
conn_status = drm_dp_mst_detect_port(connector, mstc->port->mgr,
mstc->port);
pm_runtime_mark_last_busy(connector->dev->dev);
pm_runtime_put_autosuspend(connector->dev->dev);
return conn_status;
}
static void