linux-kernel - Re: [PATCH v3 2/6] ALSA: hda/tegra: Reset hardware

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Message-ID: <7535a927-5246-4ccf-63fe-f8ded9eb6c52@gmail.com>
Date:   Mon, 25 Jan 2021 18:27:30 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sameer Pujar <spujar@...dia.com>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/6] ALSA: hda/tegra: Reset hardware

25.01.2021 18:18, Takashi Iwai пишет:
> On Wed, 20 Jan 2021 01:31:50 +0100,
> Dmitry Osipenko wrote:
>>
>> Reset hardware on RPM-resume in order to bring it into a predictable
>> state.
>>
>> Tested-by: Peter Geis <pgwipeout@...il.com> # Ouya T30 audio works
>> Tested-by: Matt Merhar <mattmerhar@...tonmail.com> # Ouya T30 boot-tested
>> Tested-by: Nicolas Chauvet <kwizart@...il.com> # TK1 boot-tested
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> 
> Currently we have neither dependency nor reverse-selection of
> CONFIG_RESET_CONTROLLER.  It wouldn't be a problem for builds, but
> you'll get a runtime error from
> devm_reset_control_array_get_exclusive() always when
> CONFIG_RESET_CONTROLLER=n.
> 
> I guess it must be a corner case, but just to be sure.

The CONFIG_RESET_CONTROLLER=y at least for ARM32 Tegra builds.

https://elixir.bootlin.com/linux/v5.11-rc5/source/arch/arm/mach-tegra/Kconfig#L15

Not sure about ARM64.