linux-kernel - Re: [PATCH v2 26/28] ASoC: codecs: Add support for the framer codec

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Date:   Tue, 8 Aug 2023 11:06:13 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 26/28] ASoC: codecs: Add support for the framer codec

On Tue, 8 Aug 2023 08:26:16 +0000
Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> Le 26/07/2023 à 17:02, Herve Codina a écrit :
> > The framer codec interracts with a framer.
> > It allows to use some of the framer timeslots as audio channels to
> > transport audio data over the framer E1/T1/J1 lines.
> > It also reports line carrier detection events through the ALSA jack
> > detection feature.
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>  
> 
> Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
> 
> See below
> 
> > +static int framer_dai_hw_rule_channels_by_format(struct snd_soc_dai *dai,
> > +						 struct snd_pcm_hw_params *params,
> > +						 unsigned int nb_ts)
> > +{
> > +	struct snd_interval *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
> > +	snd_pcm_format_t format = params_format(params);
> > +	struct snd_interval ch = {0};
> > +
> > +	switch (snd_pcm_format_physical_width(format)) {
> > +	case 8:
> > +		ch.max = nb_ts;
> > +		break;
> > +	case 16:
> > +		ch.max = nb_ts / 2;
> > +		break;
> > +	case 32:
> > +		ch.max = nb_ts / 4;
> > +		break;
> > +	case 64:
> > +		ch.max = nb_ts / 8;
> > +		break;
> > +	default:
> > +		dev_err(dai->dev, "format physical width %u not supported\n",
> > +			snd_pcm_format_physical_width(format));
> > +		return -EINVAL;
> > +	}  
> 
> What about
> 
> 	width = snd_pcm_format_physical_width(format);
> 
> 	if (width == 8 || width == 16 || width == 32 || width == 64) {
> 		ch.max = nb_ts * 8 / width;
> 	} else {
> 		dev_err(dai->dev, "format physical width %u not supported\n", width);
> 		return -EINVAL;
> 	}
> 

Yes, indeed.
Will be changed in the next iteration.

Regards,
Hervé