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

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Date:   Thu, 8 Jul 2021 17:31:00 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Frank Wunderlich <frank-w@...lic-files.de>
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,
        Chun-Kuang Hu <chunkuang.hu@...nel.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>
Subject: Aw: Re: BUG: MTK DRM/HDMI broken on 5.13 (mt7623/bpi-r2)

> Gesendet: Donnerstag, 08. Juli 2021 um 11:35 Uhr
> Von: "Frank Wunderlich" <frank-w@...lic-files.de>
> i guess not, but is watchdog somehow involved? i ask because i see this on reboot/poweroff:
>
> "watchdog: watchdog0: watchdog did not stop!"
>
> i see this with my 5.13, 5.12-drm (5.12.0+mtk/core drm-patches) and 5.12.14 too (hdmi is working there), but not 5.12.0!
> that means something in drm-patches (mtk/core) breaks watchdog. maybe the recursion mentioned above?

have to correct me: 5.12.0 shows this error too, so error not caused by drm-patches, but i guess unrelated to the possible irq issue causing hdmi not working on 5.13 (wait-for-vblank/page_flip tracebacks)

i'm not aware who is also involved in the problem, so i want to avoid send people to the wrong way :)

regards Frank