linux-kernel - Re: [PATCH 3/3] ASoC: tlv320aic32x4: Enable fast charge

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Message-ID: <20200915115034.GA5576@sirena.org.uk>
Date:   Tue, 15 Sep 2020 12:50:34 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/3] ASoC: tlv320aic32x4: Enable fast charge

On Tue, Sep 15, 2020 at 10:26:02AM +0200, Alexandre Belloni wrote:
> On 11/09/2020 19:31:40+0200, Miquel Raynal wrote:

> > +	/*
> > +	 * Enable the fast charging feature and ensure the needed 40ms ellapsed
> > +	 * before using the analog circuits.
> > +	 */
> > +	snd_soc_component_write(component, AIC32X4_REFPOWERUP,
> > +				AIC32X4_REFPOWERUP_40MS);
> > +	msleep(40);
> > +

> Maybe the actual REFPOWERUP value could be exposed as a control so
> userspace has a way to set the policy? 

We very rarely do this, there's not usially anything 

> I'm not sure it make sense to have the delay in probe because it is not
> enable the analog part of the codec. The delay should probable be after
> the clocks have been set up because the datasheet says that it is mdac
> and madc that is starting the analog circuitry.

Deferring the delay to a workqueue is the usual thing where there's
concerns about slowing down boot.

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