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From:   Gonsolo <gonsolo@gmail.com>
Date:   Thu, 3 Oct 2019 19:49:26 +0200
Message-ID: <CANL0fFTSxV8catdjwVLNBRtp2MrNUsSimz1WMdNPYAb_VVns9g@mail.gmail.com>
Subject: Re: [PATCH] si2157: Add support for Logilink VG0022A.
To:     Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc:     JP <jp@jpvw.nl>, crope@iki.fi, Sean Young <sean@mess.org>,
        linux-media@vger.kernel.org,
        Linux Kernel <linux-kernel@vger.kernel.org>
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> Weird... it sounds that, after si2168 has its firmware updated, it
> starts interfering at si2157. Perhaps there's a bug at si2168 I2C
> gate mux logic. Are you using a new Kernel like 5.2?

Everything is based on git://linuxtv.org/media_tree.git which is at
5.4-rc1 right now.

> I guess the best is to enable the debug logs in order to see what's
> happening on both cases.
>
> You can enable all debug messages (after loading the modules) with:
>
>         # for i in $(cat /sys/kernel/debug/dynamic_debug/control |grep -E '(si21|af9035)' |cut -d' ' -f 1); do echo "file $i +p" >>/sys/kernel/debug/dynamic_debug/control; done

I'll give that a try.

> You could also try to disable the firmware upload at si2168 and see
> if the si2157 reads will succeed.

That too. Thanks for the advice.


-- 
g