linux-kernel - Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

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Message-ID: <20160602102651.GF2282@sirena.org.uk>
Date:	Thu, 2 Jun 2016 11:26:51 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Andrea Venturi <ennesimamail.av@...il.com>,
	Code Kipper <codekipper@...il.com>, gianfranco@...devices.com
Subject: Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

On Wed, Jun 01, 2016 at 07:54:28PM +0200, Maxime Ripard wrote:

> @@ -16,4 +25,5 @@ config SND_SUN4I_SPDIF
>  	help
>  	  Say Y or M to add support for the S/PDIF audio block in the Allwinner
>  	  A10 and affiliated SoCs.
> +
>  endmenu

Unrelated whitespace change.

> +static int sun4i_i2s_params_to_sr(struct snd_pcm_hw_params *params)
> +{
> +	switch (params_width(params)) {
> +	case 16:
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}

The switch statement here and in the _wss() function look weird because
they don't have default cases.  Since there's only one user of both
functions it seems better to have the switch statements inline anyway.

> +	for (i = 0; sun4i_i2s_mclk_div[i].div; i++) {
> +		const struct sun4i_i2s_clk_div *mdiv = sun4i_i2s_mclk_div + i;

Why not just write these as normal array lookups?

> +	switch (rate) {
> +        case 176400:
> +        case 88200:

Weird indentation here...  it also seems spaces not tabs are being
used for the case labels.

> +	clk_set_rate(i2s->mod_clk, clk_rate);

Should really check the return value.

> +	/* Enable the first output line */
> +	regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
> +			   SUN4I_I2S_CTRL_SDO_EN_MASK,
> +			   SUN4I_I2S_CTRL_SDO_EN(0));
> +
> +	/* Enable the first two channels */
> +	regmap_write(i2s->regmap, SUN4I_I2S_TX_CHAN_SEL_REG,
> +		     SUN4I_I2S_TX_CHAN_SEL(2));
> +
> +	/* Map them to the two first samples coming in */
> +	regmap_write(i2s->regmap, SUN4I_I2S_TX_CHAN_MAP_REG,
> +		     SUN4I_I2S_TX_CHAN_MAP(0, 0) | SUN4I_I2S_TX_CHAN_MAP(1, 1));

We don't undo these if setup fails...  do them once on probe?

> +static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
> +{
> +        struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +	u32 val;

More tab/space damage, there seems to be quite a bit in the rest of the
driver.

> +static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
> +{
> +	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +
> +	/* Enable the whole hardware block */
> +	regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG,
> +		     SUN4I_I2S_CTRL_GL_EN);

Runtime PM?  It also seems like this is something that ought to be
covered in the suspend and resume callbacks.

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