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

[Chris Wilson]

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.
> 
> Most of the cases are coverred by psr_exit at set_domain. The remaining cases
> are coverred by triggering it at set_domain, busy_ioctl, sw_finish and
> mark_busy.
> 
> The downside here might be reducing the residency time on the cases this
> already work very wall like Gnome environment. But so far let's get focused
> on fixinge issues sio PSR couild be used for everybody and we could even
> get it enabled by default. Later we can add some alternatives to choose the
> level of PSR efficiency over boot flag of even over crtc property.

What happened to the front buffer tracking?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre