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From:   Frank Wunderlich <frank-w@public-files.de>
To:     Frank Wunderlich <frank-w@public-files.de>,
        CK Hu <ck.hu@mediatek.com>,
        Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Cc:     Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Philipp Zabel <p.zabel@pengutronix.de>,
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        Matthias Brugger <matthias.bgg@gmail.com>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Collabora Kernel ML <kernel@collabora.com>,
        chunkuang Hu <chunkuang.hu@kernel.org>
Subject: Aw: Re: BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)
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Date:   Fri, 9 Jul 2021 12:02:09 +0200
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Hi,

i've found it :)

hdmi-problem is caused by

commit 440147639ac79f699a4eb9811d0bc39d3cc815f4
Author: CK Hu <ck.hu@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 w=
orks (ovl irq-handler called)

$ git logone v5.12..v5.13-rc1 -- drivers/ | grep 'mtk\|mediatek' | grep mm=
sys
060f7875bd23 2021-04-05 soc: mediatek: mmsys: Add support for MT8167 SoC
1ff1270fca33 2021-03-30 soc: mediatek: mmsys: Add mt8183 mmsys routing tab=
le
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 s=
tore context data

git revert 060f7875bd23 1ff1270fca33 440147639ac7 ce15e7faa2fc

and after reapplying them one-by-one it stops working on commit above (440=
147639ac7)

@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