[PATCH] drm/dp/mst: Restore primary hub guid on resume

2016-04-15 Thread Daniel Vetter
On Fri, Apr 15, 2016 at 08:41:30AM -0400, Harry Wentland wrote: > Patch makes sense to me. It looks like when the receiver detects an upstream > disconnect it will reset its internal state, at least somewhat. We've seen > that happen when system enters S3 and GPU loses power. > > Reviewed-by: Harr

[PATCH] drm/dp/mst: Restore primary hub guid on resume

2016-04-15 Thread Harry Wentland
Patch makes sense to me. It looks like when the receiver detects an upstream disconnect it will reset its internal state, at least somewhat. We've seen that happen when system enters S3 and GPU loses power. Reviewed-by: Harry Wentland Harry On 2016-04-13 04:50 PM, Lyude wrote: > Some hubs are

[PATCH] drm/dp/mst: Restore primary hub guid on resume

2016-04-13 Thread Lyude
Some hubs are forgetful, and end up forgetting whatever GUID we set previously after we do a suspend/resume cycle. This can lead to hotplugging breaking (along with probably other things) since the hub will start sending connection notifications with the wrong GUID. As such, we need to check on res