[Intel-gfx] [PATCH 3/4] drm/i915: Ironlake suspend/resume support

Eric Anholt eric at anholt.net
Wed Oct 21 19:01:52 CEST 2009

On Wed, 2009-10-21 at 13:23 +0800, Zhenyu Wang wrote:
> On 2009.10.21 10:10:33 +0800, Guo, Chaohong wrote:
> > 
> >     After resuming from S3,  drm will force-set-mode, and the TRANS_HOTAL_X
> > like registers will be set according to HOTAL like registers,  seems that it is not
> > necessary to save/restore TRANS_xxx registers. Is it right ?
> > 
> I think we have a rule that any touched register should be saved/restore for suspend,
> to be sure the state is consistent after resume.

It used to be a strict rule, before we were calling our normal modeset
path in resume.

Eric Anholt
eric at anholt.net                         eric.anholt at intel.com

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