[Intel-gfx] [PATCH 06/11] drm/i915: Force PSR exit by inactivating it.

[Vijay Purushothaman]

On 5/16/2014 10:12 PM, Rodrigo Vivi wrote:
>
>
>
> On Fri, May 16, 2014 at 3:23 AM, Chris Wilson <chris at chris-wilson.co.uk
> <mailto:chris at chris-wilson.co.uk>> wrote:
>
>     On Thu, May 15, 2014 at 08:13:05PM -0400, Rodrigo Vivi wrote:
>      > The perfect solution for psr_exit is the hardware tracking the
>     changes and
>      > doing the psr exit by itself. This scenario works for HSW and BDW
>     with some
>      > environments like Gnome and Wayland.
>      >
>      > However there are many other scenarios that this isn't true.
>     Mainly one right
>      > now is KDE users on HSW and BDW with PSR on. User would miss many
>     screen
>      > updates. For instances any key typed could be seen only when
>     mouse cursor is
>      > moved. So this patch introduces the ability of trigger PSR exit
>     on kernel side
>      > on some common cases that.
>
>     You know that userspace has been waiting for a PSR flag for over a year
>     now so that it can use the more efficient rendering paths when it makes
>     sense.
>
>
> yeah... this item is lingering on my to do list... but reaching a point
> where I won't be able to continue postponing it ;)
>
>> What happened to the front buffer tracking?
>
> What front buffer tracking? hehe
> I'm wondering about this since I started looking to fbc and psr and
> could never find a reliable way.
>
FBC should cover most of the scenarios except cursor planes.. When ever 
cursor planes are enabled you can fall back to s/w controlled exit path.

If you can elaborate on the exact issue that you are facing with FBC and 
PSR may be i can help..

Thanks,
Vijay

>
>     -Chris
>
>     --
>     Chris Wilson, Intel Open Source Technology Centre
>
>
>
>
> --
> Rodrigo Vivi
> Blog: http://blog.vivi.eng.br
>
>
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