regression on suspend/resume for Carrizo

[Tom St Denis]

For what it's worth this commit also breaks resume on my Tonga only 
system so it's not specific to just Carrizo.

On 13/10/17 08:16 AM, Tom St Denis wrote:
> Hi,
> 
> This commit breaks suspend/resume on my Carrizo A12-9800 system.
> 
> [root at carrizo linux2]# git bisect bad
> 7ae4acd21e9e264afb079e23d43bcf2238c7dbea is the first bad commit
> commit 7ae4acd21e9e264afb079e23d43bcf2238c7dbea
> Author: Leo (Sunpeng) Li <sunpeng.li at amd.com>
> Date:   Thu Sep 7 17:05:38 2017 -0400
> 
>      drm/amd/display: Match actual state during S3 resume.
> 
>      During system suspend, we:
> 
>      1. Cache a duplicate of the current DRM atomic state, which calls 
> hooks
>         to duplicate our internal states.
>      2. Call hooks to disable all functionalities.
>      3. System suspended.
> 
>      During resume, we attempt to restore the cached state. However, our
>      interal states are now stale, since step 1 was done before step 2.
>      i.e. our cached state does not reflect the disabled nature of things.
> 
>      This change resolves that by destroying all relevant states to reflect
>      the actual state during resume.
> 
>      Signed-off-by: Leo (Sunpeng) Li <sunpeng.li at amd.com>
>      Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
> 
> Tom
> _______________________________________________
> amd-gfx mailing list
> amd-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx