Yes, timer can be helpful. A revised proposal is that flip trigger +
timer to cover together. I'll come up with more details soon.
- Daisy
On 7/25/2014 12:22 AM, Daniel Vetter wrote:
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@xxxxxxxxx> 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@xxxxxxxx [mailto:daniel.vetter@xxxxxxxx] On Behalf Of Daniel Vetter
Sent: Monday, July 14, 2014 12:04 AM
To: Sun, Daisy
Cc: Chris Wilson; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH v2] drm/i915/bdw: BDW Software Turbo
On Mon, Jul 14, 2014 at 8:59 AM, Daniel Vetter <daniel@xxxxxxxx> 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
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Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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Jesse Barnes, Intel Open Source Technology Center
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