On 2018-03-07 02:54 PM, KARBOWSKI Piotr wrote:
> On 2018-03-07 20:31, KARBOWSKI Piotr wrote:
>> On 2018-03-07 20:12, Harry Wentland wrote:
>>> 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.
>>
>> Like on those screenshots
>>
>>
>>      https://i.imgur.com/qnDOKY7.jpg
>>      https://i.imgur.com/XH42zit.jpg
>>
>> To describe it better, lets split the screen into 4 segments
>>
>> +-----+-----+
>> |  A  |  B  |
>> +-----+-----+
>> |  C  |  D  |
>> +-----+-----+
>>
>> The screen resolution kicks in as it should, 1080p, then A displays proper 
>> part of screen, around 25%, then B contain a copy of what A displays, so the 
>> same 25% of top-left part of screen, then C and D remain black, if I scroll 
>> the screen a bit, C and D an get a bold vertical line of whatever color was 
>> on screen, if I had a white/gray font, it will be it, if there was some blue 
>> text, it will be blue until I scroll a bit more.
>>
>>
>> drm-fixes-4.16 yield the same effect as amd-staging-drm-next without 
>> 0001-drm-amd-display-Fix-takeover-from-VGA-mode.patch, but it seems that 
>> htis patch is already in drm-fixes-4.16 so I am confused.
> 
> I was not correct.
> 
> The drm-fixes-4.16 is a bit better It fixes half of my issue! So with this 
> handy ascii art of mine
> 
>   +-----+-----+
>   |  A  |  B  |
>   +-----+-----+
>   |  C  |  D  |
>   +-----+-----+
> 
> A and C works, so I have full termianl on left side. but B remains copy of A 
> and D either is black of have the fancy line.
> 

amd-stg has some other patches relating to DCN pipe-split that I don't fully 
understand. We might need one or more of those.

As a workaround you can probably set 'force_single_disp_pipe_split' to 'false' 
in 'debug_defaults_drv' in dc/dcn10/dcn10_resource.c.

Harry

> I compared manually the patch that did worked for me and it seems it was not 
> fully applied, the .h and .c does not look the same. Perhaps that's the 
> source here.
> 
> -- Piotr.
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