[Intel-gfx] [PATCH 0/4] PSR Critical fixes

[Vivi, Rodrigo]

On Fri, 2015-11-13 at 17:08 +0200, Ville Syrjälä wrote:
> On Wed, Nov 11, 2015 at 11:37:06AM -0800, Rodrigo Vivi wrote:
> > Let's split critical PSR fixes from the series that contains other
> > reworks, stabilization and improvements.
> > 
> > The second patch in this series isn't considered critical in terms
> > of functionality, but it depends on the first one and it can be 
> > consider
> > a fix for PSR residency on VLV/CHV.
> 
> FYI I recently glanced at the psr code and a few things that left me
> scratching my head:

Thanks for spotting this.

> - hsw_psr_enable_sink() frobs at the AUX registers without holding 
> the hw_mutex.
>   On SKL+ it seems to use the normal AUX registers here. Before it 
> used
>   the special PSR registers, so that may have been OK, but the SKL+
>   thing seems rather questionable.

Yes, I agree. I'll take a look.

> - intel_psr_enable() calls intel_psr_activate() on SKL+ but not on
>   HSW/BDW. I'm thinking there should be a comment there to make it 
> clear
>   why, if it's even correct.

Indeed. Also Durga when reviewing mentioned it would be good to make
only worker calling _activate(). So I will follow-up with a patch to
fix this.


>