BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)

[Enric Balletbo Serra]

Hi Frank,

Missatge de Frank Wunderlich <frank-w at public-files.de> del dia dv., 9
de jul. 2021 a les 12:02:
>
> Hi,
>
> i've found it :)
>
> hdmi-problem is caused by
>
> commit 440147639ac79f699a4eb9811d0bc39d3cc815f4
> Author: CK Hu <ck.hu at mediatek.com>
> Date:   Wed Mar 17 19:17:10 2021 +0100
>
>     soc: mediatek: mmsys: Use an array for setting the routing registers
>
> but i cannot revert it alone, but after reverting all mmsys-patches hdmi works (ovl irq-handler called)
>

If this is the offending commit, could you try if the following patch
fixes the issue for you?

https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/commit/?h=v5.13-next/fixes&id=db39994e0bd852c6612a9709e63c09b98b161e00

If not, and that patch is the offending commit, it probably means that
the default routing table doesn't work for mt7623. Needs a specific
soc table.

Thanks,
  Enric.

> $ git logone v5.12..v5.13-rc1 -- drivers/ | grep 'mtk\|mediatek' | grep mmsys
> 060f7875bd23 2021-04-05 soc: mediatek: mmsys: Add support for MT8167 SoC
> 1ff1270fca33 2021-03-30 soc: mediatek: mmsys: Add mt8183 mmsys routing table
> 440147639ac7 2021-03-17 soc: mediatek: mmsys: Use an array for setting the routing registers
> ce15e7faa2fc 2021-03-17 soc: mediatek: mmsys: Create struct mtk_mmsys to store context data
>
> git revert 060f7875bd23 1ff1270fca33 440147639ac7 ce15e7faa2fc
>
> and after reapplying them one-by-one it stops working on commit above (440147639ac7)
>
> @Dafna can you confirm it solves your issue too?
>
> btw. watchdog issue is caused by
>
> commit bbece05c0d3a96817483e0b249ad1e302ba95117
> watchdog: mtk_wdt: Remove mtk_wdt_stop() in probe() to prevent the system freeze and it doesn't reboot by watchdog problem
>
> have already contacted author
>
> regards Frank