linux-kernel - Re: [PATCH v2 0/2] fix tegra-hda on tegra30 devices

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Date:   Tue, 12 Jan 2021 14:00:37 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Peter Geis <pgwipeout@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Sameer Pujar <spujar@...dia.com>,
        Mohan Kumar <mkumard@...dia.com>, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH v2 0/2] fix tegra-hda on tegra30 devices

On Tue, Jan 12, 2021 at 09:22:38AM +0100, Takashi Iwai wrote:
> On Fri, 08 Jan 2021 14:59:11 +0100,
> Peter Geis wrote:
> > 
> > The following patches fix tegra-hda on legacy tegra devices.
> > Two issues were discovered preventing tegra-hda from functioning:
> > -The hda clocks on tegra30 were assigned to clk_m and running at too low
> > of a rate to function.
> > -The tegra-hda encounters an input/output error when opening a stream.
> > 
> > Since the only mainline device that used tegra-hda until recently was the
> > t124, it is unknown exactly when this was broken. Fortunately a recent
> > patch was submitted that fixed the issue only on t194 devices. We can
> > apply it to the tegra30-hda device to resolve the issue across the board.
> > Note that downstream devices used the spdif device instead of hda for hdmi
> > audio. The spdif device lacks a driver on mainline.
> > 
> > -Checkpatch seems to have issues finding [1], but git show has no issue.
> > [1] commit 60019d8c650d ("ALSA: hda/tegra: workaround playback failure on
> > Tegra194")
> > 
> > Changelog:
> > 
> > v2:
> > -Added ack and reviewed-by from Jon
> > -Updated fix to apply to tegra30-hda vice universally (Thanks Jon)
> > -Updated commit to include comments from hardware team (Thanks Sameer)
> > -Cleaned up commit messages
> > 
> > Peter Geis (2):
> >   clk: tegra30: Add hda clock default rates to clock driver
> >   ALSA: hda/tegra: fix tegra-hda on tegra30 soc
> 
> Shall I apply both patches via sound git tree?
> 
> Or, if you want to take through clk tree, let me know.  In that case,
> feel free to take my ack:
> Acked-by: Takashi Iwai <tiwai@...e.de>

There doesn't seem to be a build-time (or even runtime) dependency
between the two patches and they fix two independent issues, so they
could also go in separately.

I'm fine either way. From a Tegra perspective, the Tegra30 clock driver
is very low activity, so I don't expect any conflicts with between this
and some other patches that might go in through the clock tree.

Thierry

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