[PATCH 27/27] drm: rockchip: Add VOP2 driver

[Piotr Oniszczuk]

> Wiadomość napisana przez Sascha Hauer <s.hauer at pengutronix.de> w dniu 27.01.2022, o godz. 12:00:
> 
>> 
>> -on rk3399 it gives me 4k screen where right vertical 1/3 part of screen is garbage
>> -on rk3566 my samsung 4k monitor has black screen and cycle of OSD msgs: HDMI2 connected; HDMI2 disconnected; ....
> 
> Same here on my rk3568, also with a samsung monitor. Was it 4k at 60Hz or
> 4k at 30Hz? If the former, could you give 4k at 30Hz a try? That mode works
> well here.

It was 4k at 30
Indeed - firmware of my samsung is total crap in UI aspects - so maybe in hdmi modes are as well :-p
Anyway - this crap monitor works ok with 4k at 30 on AW/RPI4/rk3399/n3450/MacBookPro

>> 
>> BTW: getting well working 4k HDMI modes on rk3399 was real story for me.
>> There is many different series of patches to address this - but all have some subtle issues for me (i.e. 4k HDMI modes works but i.e. Qt is failing with DRM atomic commits in EGLFS)
>> I developed well working [1] giving me reliable 4k on rk3399 (including working Qt DRM drawing in EGLFS mode) 
>> Maybe it will be somehow helpful to get 4k modes solution for rk3566 _and_ rk3399 (on single kernel binary)?
>> 
>> [1] https://github.com/warpme/minimyth2/blob/master/script/kernel/linux-5.16/files/0730-drm-rockchip-add-4k-videomodes-support.patch
> 
> At least there are patches in it that I have in my series as well and
> keep popping up everywhere like "drm/rockchip: dw_hdmi: Use
> auto-generated tables" and "drm/rockchip: dw_hdmi: Set cur_ctr to 0
> always"
> 

What was time-consuming for me was finding working patches combination which not breaks Qt DRM Atomic commits.
Many series floating arround various git repos/projects were offering 4k modes but breaking Qt in the same time....

btw: have you plans to look/address non-working DRM planes in VOP2?
Rendering to DRM plane gives me green screen on rk3566.
The same code (and binaries) are working ok on rk3399 (and other SoCs).