linux-kernel - Re: [PATCH v1 0/5] Clock and reset improvements for Tegra ALSA drivers

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Date:   Fri, 15 Jan 2021 10:52:50 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Dmitry Osipenko <digetx@...il.com>,
        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>, Jaroslav Kysela <perex@...ex.cz>
Cc:     alsa-devel@...a-project.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/5] Clock and reset improvements for Tegra ALSA
 drivers

On 12/01/2021 12:58, Dmitry Osipenko wrote:
> This series improves the handling of clock and reset controls of
> NVIDA Tegra ALSA drivers. Tegra HDA and AHUB drivers aren't handling
> resets properly, which needs to be fixed in order to unblock other patches
> related to fixes on the reset controller driver since HDA/AHUB are bound
> to fail once reset controller driver will be corrected. In particular ALSA
> drivers are relying on implicit de-assertion of resets which is done by the
> tegra-clk driver. It's not the business of the clk driver to touch resets
> and we need to fix this because it breaks reset/clk programming sequences
> of other Tegra drivers.
> 
> Dmitry Osipenko (5):
>    ALSA: hda/tegra: Use clk_bulk helpers
>    ALSA: hda/tegra: Reset hardware
>    ASoC: tegra: ahub: Use of_reset_control_array_get_exclusive()
>    ASoC: tegra: ahub: Use clk_bulk helpers
>    ASoC: tegra: ahub: Reset hardware properly
> 
>   sound/pci/hda/hda_tegra.c      |  86 +++++++++------------------
>   sound/soc/tegra/tegra30_ahub.c | 103 ++++++---------------------------
>   sound/soc/tegra/tegra30_ahub.h |   6 +-
>   3 files changed, 49 insertions(+), 146 deletions(-)

I wonder if this will help with the issues we saw when the tegra is
the i2s clock slave.


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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