linux-kernel - Re: [PATCH v1 00/35] drm: Analog TV Improvements

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Message-ID: <20220826083931.sd7oxpbsnxrqij52@houat>
Date:   Fri, 26 Aug 2022 10:39:31 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Mateusz Kwiatkowski <kfyatek@...il.com>
Cc:     Noralf Trønnes <noralf@...nnes.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v1 00/35] drm: Analog TV Improvements

On Fri, Aug 26, 2022 at 06:07:47AM +0200, Mateusz Kwiatkowski wrote:
> Hi Maxime, Noralf and everyone,
> 
> Just as a quick update. I isolated the issue to the power management subsystem.
> Unfortunately I know very little about the power management subsystem so
> I don't think I can help.
> 
> There are two alternative dirty ad-hoc hacks that get things working.
> 
> - Commenting out the pm_runtime_put() / pm_runtime_get_sync() calls in vc4_vec.c
> - Reverting this PR by Dom Cobley a.k.a. popcornmix:
>   https://github.com/raspberrypi/linux/pull/4639

We don't have that PR upstream, so that might be the explanation to why
you're seeing this and I don't. I'll look into this further and will
open an issue.

I can't see anything wrong with the pm_runtime use though.

> Either of these approaches makes VEC mode switching work again. Obviously
> neither is appropriate for a permanent solution.
> 
> I tried some random code permutations that came to my mind, like using the
> vc4_encoder callbacks (e.g. post_crtc_powerdown) instead of the standard
> enable/disable encoder callbacks, but to no avail.
> 
> Since the clocks and power management seem to be delegated to the firmware now,
> my guess is that this might be a firmware issue, but I can't really check all
> the firmware versions. It certainly crashes on the version currently available
> in Raspberry Pi OS repos, and on this one:
> https://github.com/raspberrypi/rpi-firmware/commit/4dde751. My Pi4 doesn't boot
> using any newer firmware, at least not from USB - I might try some SD card
> after the weekend.

Thanks for your testing

Maxime

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