Yup, that's there as
Author: Tony Cheng <tony.ch...@amd.com>
Date: Thu Oct 5 14:38:46 2017 -0400
drm/amd/display: default force_single_disp_pipe_split = 1 on RV
On 2018-03-07 02:16 PM, Tom St Denis wrote:
> It's an old patch but does drm-fixes-4.16 have this patch
> commit e92b44fdee3ec0b679bacdb9c7e95e55699167f0
> Refs: v4.14-rc3-1871-ge92b44fdee3e
> Author: Tony Cheng <tony.ch...@amd.com>
> AuthorDate: Thu Oct 5 14:38:46 2017 -0400
> Commit: Alex Deucher <alexander.deuc...@amd.com>
> CommitDate: Sat Oct 21 16:52:21 2017 -0400
> drm/amd/display: default force_single_disp_pipe_split = 1 on RV
> 1080p idle, stutter efficiency goes up from 95.8% to 97.8%
> result in 5mW saving from APU and 8mW saving from DDR4
> Signed-off-by: Tony Cheng <tony.ch...@amd.com>
> Reviewed-by: Yongqiang Sun <yongqiang....@amd.com>
> Acked-by: Harry Wentland <harry.wentl...@amd.com>
> Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
> On 03/07/2018 02:12 PM, Harry Wentland wrote:
>> On 2018-03-07 12:38 PM, KARBOWSKI Piotr wrote:
>>> On 2018-03-07 17:48, KARBOWSKI Piotr wrote:
>>>> On 2018-03-07 17:14, Harry Wentland wrote:
>>>>> Pushed a drm-fixes-4.16 branch (based on Alex's) to my FDO repo
>>>>> athttps://cgit.freedesktop.org/~hwentland/linux/ but I don't have a
>>>>> Raven system setup to test this at the moment.
>>>>> Tom, or Piotr, would you be able to check that the fix works as intended
>>>>> on that branch?
>>>> Tested that branch, confirmed that the VGA patch is there but I got the
>>>> original result of broken video. Rebooted few times. It seems that my
>>>> issue was not the VGA turnover afterall. I will re-test it with vanilla
>>>> amd-staging-drm-next of git://people.freedesktop.org/~agd5f/linux without
>>>> the VGA patch and update you.
>> Thanks for testing.
>> What do you mean with broken video? I tried going back in the email thread
>> but I'm not 100% clear what you mean by this.
>> BTW, drm-fixes-4.16 are fixes we intend to get into the 4.16 upstream
>> kernel. amd-staging-drm-next is our development tree and quite a bit farther
>> ahead in development. I'm trying to find fixes to backmerge to 4.16 to make
>> everyone happy when it releases.
>>> I re-tested original tree of git://people.freedesktop.org/~agd5f/linux on
>>> branch amd-staging-drm-next and got the 'double screen' glitches, then I
>>> applied the patch Tom sent me as the very first response to this thread and
>>> then it indeed fixed it. So the VGA takeover patch is needed it, it seems.
>>> I triple checked and build the images and the drm-fixes-4.16 of
>>> git://people.freedesktop.org/~hwentland/linux does not fix the problem for
>>> So far only amd-staging-drm-next with
>>> 0001-drm-amd-display-Fix-takeover-from-VGA-mode.patch does the trick. One
>>> thing worth note is that the amd-staging-drm-next goes as `rc1` where yours
>>> fork Harry appears to be rc3, no idea if it's related or not.
>>> -- Piotr.
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