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

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Message-ID: <20160318150404.GA30829@earth>
Date:	Fri, 18 Mar 2016 16:04:04 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	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

Hi,

On Fri, Mar 18, 2016 at 03:45:26PM +0200, Ivaylo Dimitrov wrote:
> On 18.03.2016 15:36, Sebastian Reichel wrote:
> 
> >Have you tried the ideas from <20160317004917.GA6750@...th> (Date:
> >Thu, 17 Mar 2016 01:49:18 +0100)?
> >
> 
> To the extend I understood them :)
> 
> Regulator is V28_A, which is always-on, so it is enabled no matter what
> probe does. Anyway, I added a various delays after regulator_enable(), to no
> success.

Did you by chance also test adding a delay after setting the power
gpio? According to the datasheet:

Start-up time from shutdown: typical 5ms

> I didn't try building the driver as a module, instead I played with
> bind/unbind functionality - makes no difference.

Ok.

-- Sebastian

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