Modesetting (amdgpudrmfb) artifacts on RAVEN APU

[Harry Wentland]

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.

Harry

> 
> 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 me.
> 
> 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.