linux-kernel - Aw: Re: BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)

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Message-ID: <trinity-fd86a04e-81b6-45f0-8ab4-5c21655bdf53-1625824929532@3c-app-gmx-bap43>
Date:   Fri, 9 Jul 2021 12:02:09 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Frank Wunderlich <frank-w@...lic-files.de>,
        CK Hu <ck.hu@...iatek.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Cc:     Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Collabora Kernel ML <kernel@...labora.com>,
        chunkuang Hu <chunkuang.hu@...nel.org>
Subject: Aw: Re: BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)

Hi,

i've found it :)

hdmi-problem is caused by

commit 440147639ac79f699a4eb9811d0bc39d3cc815f4
Author: CK Hu <ck.hu@...iatek.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)

$ 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