linux-kernel - Re: [RFC v1] tlv320aic32x4: delay i2c access by 1 ms after hardware reset

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Message-ID: <20190211220230.7cd7b559@gmx.net>
Date:   Mon, 11 Feb 2019 22:02:30 +0100
From:   Peter Seiderer <ps.report@....net>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, b-ak <anur.bhargav@...il.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org
Subject: Re: [RFC v1] tlv320aic32x4: delay i2c access by 1 ms after hardware
 reset

Hello Mark,

On Mon, 11 Feb 2019 15:04:25 +0000, Mark Brown <broonie@...nel.org> wrote:

> On Sun, Feb 10, 2019 at 04:45:19PM +0100, Peter Seiderer wrote:
> 
> > @@ -972,6 +972,8 @@ static int aic32x4_component_probe(struct snd_soc_component *component)
> >  		gpio_set_value(aic32x4->rstn_gpio, 1);
> >  	}
> >  
> > +	mdelay(1);
> > +  
> 
> Perhaps only do this if we toggled the GPIO?  If the device wasn't in
> reset then there's no need to wait.

You are absolutely right with this, will re-spin the patch with
the suggested change, thanks for review...

Regards,
Peter