linux-kernel - Re: [alsa-devel] [PATCH v5 6/9] ASoC: mediatek: add mt2701 platform driver implementation.

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Message-ID: <1467293981.17087.18.camel@mtksdaap41>
Date:	Thu, 30 Jun 2016 21:39:41 +0800
From:	Garlic Tseng <garlic.tseng@...iatek.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<alsa-devel@...a-project.org>, <ir.lian@...iatek.com>,
	<srv_heupstream@...iatek.com>, <tiwai@...e.de>,
	<linux-kernel@...r.kernel.org>, <koro.chen@...iatek.com>,
	<linux-mediatek@...ts.infradead.org>, <PC.Liao@...iatek.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH v5 6/9] ASoC: mediatek: add mt2701 platform
 driver implementation.

On Wed, 2016-06-29 at 20:13 +0100, Mark Brown wrote:
> On Fri, Jun 17, 2016 at 03:43:57PM +0800, Garlic Tseng wrote:
> 
> > +static int mt2701_afe_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id,
> > +				     int div)
> > +{
> 
> Why are we adding a set_clkdiv() operation?  I would expect the driver
> to be able to figure things out automatically.
> 
> > +	case DIV_ID_MCLK_TO_BCK:
> > +		afe_priv->i2s_path[i2s_num].div_mclk_to_bck = div;
> > +		break;
> > +	case DIV_ID_BCK_TO_LRCK:
> > +		afe_priv->i2s_path[i2s_num].div_bck_to_lrck = div;
> > +		break;
> 
> Especially in the case where we're configuring LRCLK, that's trivial
> when we know the sample rate which we have to know anyway.

Oh... actually I want to say 'div_mclk_over_bck' and 'div_bck_over_lrck'
I'll fix the naming if we decide to reserve the set_clkdiv() operation.

For div_bck_over_lrck, yes we only support bck = 64fs now so I'll remove
it. Maybe in the future we'll allow bck = 32fs for some board and I'll
send patch on that time.

For div_mclk_over_bck, mt2635 can offer 128fs and 256fs mclk to codec,
and it depends on the board so I tend to let machine driver configure
it. However, maybe changing it to div_mclk_over_lrck will be better.
I'll do the change.

BTW, some patch is applied for the patchset so I need not to send the
new version but send another patchset, right?

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