Re: [PATCH v2] drm/i915/bdw: BDW Software Turbo

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Jul 24, 2014 at 01:28:21PM -0700, Jesse Barnes wrote:
> If that won't work, you could just use a timer, or tie into some other
> event that happens when the GPU is busy (e.g. execbuf or retire) instead
> of trying to tie into the display side of things.

Yes, tying into a normal timer is probably best. At least I get the
impression that we only need something regular. Of course once the gpu is
idle we need to stop rearming that timer and restart it upon first batch
when transitioning out of idle.
-Daniel

> 
> Jesse
> 
> On Tue, 15 Jul 2014 06:35:20 +0000
> "Sun, Daisy" <daisy.sun@intel.com> wrote:
> 
> > Hi Daniel, Chris
> > 
> > The concern for traditional X and media server do make sense. I'll update the patch with RP_UP_EI_INTERRUPT as trigger instead of the page flip.
> > Thanks for the valuable input.
> > 
> > - Daisy
> > 
> > -----Original Message-----
> > From: daniel.vetter@ffwll.ch [mailto:daniel.vetter@ffwll.ch] On Behalf Of Daniel Vetter
> > Sent: Monday, July 14, 2014 12:04 AM
> > To: Sun, Daisy
> > Cc: Chris Wilson; intel-gfx@lists.freedesktop.org
> > Subject: Re: [Intel-gfx] [PATCH v2] drm/i915/bdw: BDW Software Turbo
> > 
> > On Mon, Jul 14, 2014 at 8:59 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
> > > On Mon, Jul 14, 2014 at 04:22:44AM +0000, Sun, Daisy wrote:
> > >> 3) The function will be called when flip happened, this should cover 
> > >> most of the cases. One exception is background media process without 
> > >> any display output, it's relatively rare.  Please let me know if you 
> > >> have concern on other cases, I will try to cover it definitely.
> > >
> > > Traditional X never flips. And we kinda have to keep this working. 
> > > Instead of checking when flipping we need to check at regular time 
> > > intervals I guess, for as long as the gt is busy.
> > 
> > Oh and transcode servers are a real thing apparently. They also never flip, and we actually care from a business pov ...
> > -Daniel
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > +41 (0) 79 365 57 48 - http://blog.ffwll.ch
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > 
> 
> 
> -- 
> Jesse Barnes, Intel Open Source Technology Center

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch