regression on Carrizo display bringup

[Harry Wentland]

On 2017-11-14 08:30 AM, Tom St Denis wrote:
> Hi all,
> 
> Found when testing the tip of drm-next on my A12-9800 Carrizo.
> 
> [root at carrizo linux]# git bisect good
> 138a3358c17918bb5cd5aa1ea9e8760ac69c515d is the first bad commit
> commit 138a3358c17918bb5cd5aa1ea9e8760ac69c515d
> Author: Yongqiang Sun <yongqiang.sun at amd.com>
> Date:   Tue Nov 7 11:01:34 2017 -0500
> 
>     drm/amd/display: Optimize programming front end
> 
>     In case of update type is medium, optimize squence,
>     reduce programing time.
> 
>     Change-Id: Ib1793408897b0c4d4a64434c239c3703d43e83d9
>     Signed-off-by: Yongqiang Sun <yongqiang.sun at amd.com>
>     Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
>     Acked-by: Harry Wentland <harry.wentland at amd.com>
> 
> :040000 040000 8d62da91eddb89e8152b46cce5c1c8aa8edb80bf c377c5887076041e5a61640e78be756af48001ff M      drivers
> 
> 
> When I load amdgpu I get a screen that is mostly white with red bars and then some noise.  Nothing shows up in my dmesg log that is specific to this error.
> 
> When I load X it seems like it's working though.  I do get noise when I resize mpv from full to windowed (and back) but it goes away.
> 

We've had a ton of fallout from this change. Can you open a Jira ticket and queue it to us?

Harry

> 
> Tom