linux-kernel - Re: [PATCH v1 04/10] ASoC: tegra: Support RT5631 by machine driver

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Message-ID: <Y/YH5eqUgZ53vwnc@sirena.org.uk>
Date:   Wed, 22 Feb 2023 12:17:41 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Svyatoslav Ryhel <clamor95@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Dmitry Osipenko <digetx@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH v1 04/10] ASoC: tegra: Support RT5631 by machine driver

On Wed, Feb 22, 2023 at 10:00:58AM +0200, Svyatoslav Ryhel wrote:
> ср, 22 лют. 2023 р. о 00:23 Mark Brown <broonie@...nel.org> пише:

> > It feels like this is complicated enough and looks like the
> > clocking is flexible enough that it might be easier to just have
> > a table of values or otherwise enumerate standard rates, seeing
> > the code I feel like I need to worry about what happens if we
> > pick a clock rate over 6MHz (the loop could give a value over
> > that), and it's not clear why we have the switch statement rather
> > than just starting at a multiple of 128 and looping an extra time.

> > I suspect there's going to be no meaningful downside for having
> > the clock held at over 3MHz on a tablet form factor, the usual
> > issue would be power consumption but between the larger battery
> > size you tend to have on a tablet and the power draw of the
> > screen if that's on it's likely to be into the noise practially
> > speaking.

> This is how downstream handled mclk rate for RT5631.

That doesn't mean it shouldn't be fixed or improved.

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