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

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Mark,

Mark Brown <broonie@kernel.org> wrote on Tue, 15 Sep 2020 15:10:25
+0100:

> On Tue, Sep 15, 2020 at 03:02:07PM +0200, Alexandre Belloni wrote:
> > On 15/09/2020 12:50:34+0100, Mark Brown wrote:  
> > > 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   
> 
> > Could you suggest something then? This mainly changes the power
> > codec power consumption. I guess people will want to trade latency
> > for less consumption.  
> 
> Is it increasing steady state power consumption or is it just drawing
> more power during the ramp (ie, peak current consumption is bigger)?
> Usually this is trading off clean ramps for fast ramps rather than
> affecting steady state.  If it's affecting steady state a control seems
> sensible.

Indeed, it is just affecting the ramp (peak current is bigger).

Thanks,
Miquèl