[Intel-gfx] [PATCH] drm/i915/bdw: Use timeout mode for RC6 on bdw

[O'Rourke, Tom]

>On Wed, Apr 30, 2014 at 02:14:02PM -0700, Kristen Carlson Accardi wrote:
>> On Thu, 01 May 2014 00:03:15 +0300
>> Imre Deak <imre.deak at intel.com> wrote:
>>
>> > On Wed, 2014-04-30 at 13:41 -0700, Ben Widawsky wrote:
>> > > On Wed, Apr 30, 2014 at 01:34:36PM -0700, Kristen Carlson Accardi wrote:
>> > > > On Tue, 29 Apr 2014 22:31:49 -0700 Ben Widawsky
>> > > > <ben at bwidawsk.net> wrote:
>> > > >
>> > > > > On Wed, Apr 09, 2014 at 11:44:06AM -0700, Tom O'Rourke wrote:
>> > > > > > Higher RC6 residency is observed using timeout mode instead
>> > > > > > of EI mode.  This applies to Broadwell only.
>> > > > > > The difference is particularly noticeable with video
>> > > > > > playback.
>> > > > > >
>> > > > > > Issue: VIZ-3778
>> > > > > > Change-Id: I62bb12e21caf19651034826b45cde7f73a80938d
>> > > > > > Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
>> > > > >
>> > > > > I've merged this one to my bdw-rc6 branch, and therefore my
>> > > > > broadwell branch. Hopefully Kristen will see some improvement.
>> > > >
>> > > > Unfortunately, I built your bdw-rc6 branch along with the revert
>> > > > I need to get my panel to work, and I get zero rc6 residency.
>> > > > Do I have to explicitly enable it?
>> > >
>> > > I'm not actually sure. You can try it and let me know. I haven't
>> > > had any time to verify the rebase. We can check my hack.
>> >
>> > Note that in -nightly you also have to update sanitize_rc6_option()
>> > along with intel_enable_gt_powersave() and
>> > intel_disable_gt_powersave() since atm these keep RC6 disabled on BDW.
>> >
>> > --Imre
>> >
>>
>>
>> Yes, I reverted fb5ed3b201fe5670c9ffeec3b5f6ff044d543c9e and was able
>> to see some rc6 residency.  With the idle workload, residency appears
>> to be similar to before, so no regression.
>
>Thanks. I'll squash this in where appropriate.
>
>--
>Ben Widawsky, Intel Open Source Technology Center

[TOR:] Can we get this patch merged now that RC6 is working on drm-intel-nightly?
Thanks,
Tom