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

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Date:   Thu, 25 Aug 2022 18:17:50 +0200
From:   Mateusz Kwiatkowski <kfyatek@...il.com>
To:     Maxime Ripard <maxime@...no.tech>
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

Hi Maxime,

W dniu 25.08.2022 o 17:55, Maxime Ripard pisze:
> Hi Mateusz,
>
> On Mon, Aug 22, 2022 at 10:57:26AM +0200, Mateusz Kwiatkowski wrote:
>> Hi Maxime,
>>
>> I tried testing and reviewing your changes properly over the last weekend, but
>> ultimately ran into this ("flip_done timed out" etc.) issue and was unable to
>> mitigate it, at least so far. This seems to pop up every time I try to change
>> modes in any way (either change the TV norm, or just try doing
>> "xrandr --output Composite-1 --off" followed by bringing it back on; it also
>> means that the Pi goes unusable when the DE's screen saving routine kicks in).
>>
>> I'm using a Pi 4, and it works with the rpi-5.13.y branch
>> https://github.com/raspberrypi/linux, but seemingly nothing newer.
>> I specifically tried rpi-5.14.y, rpi-5.15.y and rpi-5.19.y - rpi-5.15.y,
>> which is the current main branch in Raspberry Pi OS, seems to be broken since
>> forever; at least since my patches (originally written for 5.10) landed there.
>>
>> I'll try identifying the issue further, possibly later today, and maybe check
>> the rpi-6.0.y branch as well.
>
> I've tried it this, and I can't reproduce it here. But I'm curious, how
> did you apply this series? rpi-5.13.y is probably full of conflicts
> everywhere?

I applied your patches onto rpi-5.15.y. There were conflicts, but they seemed
relatively minor. I'm not sure if I did a good job at resolving them - I ran
into various problems trying to test your changes, but I chose not to criticize
you before making sure that it's really due to your changes, or without some
remarks more constructive than "doesn't work" ;-)

I can push my rebase onto some Github fork if you're interested.

I was able to work around some of those problems, and also saw that some
of them were already mentioned by other reviewers (such as the generic modes
not matching due to the aspect ratio setting).

Ultimately I got stuck on this bug, so I put testing this series on hold
in favor of debugging the bigger issue. So far unfortunately no luck with it.

I did not try rebasing your changes onto 5.13 or older.

> Maxime

Best regards,
Mateusz Kwiatkowski