linux-kernel - Re: [PATCH 2/2] ASoC: pcm512x: Allow independently overclocking PLL, DAC and DSP

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Message-ID: <20150223143132.GD6236@finisterre.sirena.org.uk>
Date:	Mon, 23 Feb 2015 23:31:32 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Peter Rosin <peda@...ntia.se>
Cc:	Peter Rosin <peda@...ator.liu.se>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ASoC: pcm512x: Allow independently overclocking PLL,
 DAC and DSP

On Sun, Feb 22, 2015 at 12:24:12AM +0000, Peter Rosin wrote:

> ...but I'm not sure everybody agrees that overclocking games should
> be allowed by any and all users?

I don't see why not, ASoC controls are already way beyond end user a lot
of the time.

> If you still want me to convert to ALSA controls, what control do you
> suggest? SOC_SINGLE_EXT? Or should I use an enumeration, because
> mixers tend to present volume controls as a percentage of max, which
> will be confusing: You are now at "volume" 75% (of max 40), when the
> value is 30. Eeek. But enumerations from 0% to 40% sounds tedious.

I'd just use a single value, it's a UI problem with the mixer and if the
control isn't called "Volume" that shouldn cause the UI to not present
it as a volume.  He said hopefully.

Or possibly a binary control I guess which would have the nice side
effect of hiding from most non-specialist UIs.

> And how would you suggest that I name the controls?
> "Max Overclock DAC", "Max Overclock DSP" and "Max Overclock PLL"?

Those sound reasonable.

> BTW, the only troubles I've had with overclocking "too much" is that it
> has stopped working. I have not managed to fry any chip. But that is no
> guarantee, of course.

It's vanishingly unlikely that you'll cause physical damage with this
sort of thing, you're much more likely to hit performance and filter
problems than anything else.

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