linux-kernel - Re: Nokia N900 - audio TPA6130A2 problems

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Date:	Mon, 21 Mar 2016 13:45:15 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	Sebastian Reichel <sre@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Pali Rohár <pali.rohar@...il.com>,
	Jarkko Nikula <jarkko.nikula@...mer.com>,
	Tony Lindgren <tony@...mide.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Nishanth Menon <nm@...com>, merlijn@...zup.org
Subject: Re: Nokia N900 - audio TPA6130A2 problems

On Mon, Mar 21, 2016 at 03:39:15PM +0200, Ivaylo Dimitrov wrote:
> On 21.03.2016 13:45, Mark Brown wrote:

> >No, if the voltage is variable we can't tell what the current
> >constraints are without something telling us so we just don't vary the
> >voltage until we're told to do this.  If we immediately lower the
> >voltage to the minimum supported voltage that's going to break things.

> There are constraints set by the board DTS. Isn't it reasonable the
> framework to set the voltage to minimum voltage from the dts if the current
> set one is bellow it?

Yes, if it's out of bounds for the constraints we should bring it
up/down to the minimum/maximum (when copying people into a thread it's a
good idea to explain what the problem you are trying to solve is,
especially if you're throwing around bodges).

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