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Commit c94aa30e authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: arizona: Allow number of channels clocked to be restricted 



Place a cap on the number of channels clocks are generated for. This is
intended for use with systems which have the WM5102 master an I2S bus with
multiple data lines.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent f2c26d48

include/linux/mfd/arizona/pdata.h

+9 −0
Original line number Diff line number Diff line
@@ -62,6 +62,8 @@ 


#define ARIZONA_MAX_OUTPUT 6



#define ARIZONA_MAX_AIF 3



#define ARIZONA_HAP_ACT_ERM 0

#define ARIZONA_HAP_ACT_LRA 2
@@ -96,6 +98,13 @@ struct arizona_pdata { 
	/** Pin state for GPIO pins */

	int gpio_defaults[ARIZONA_MAX_GPIO];



	/**

	 * Maximum number of channels clocks will be generated for,

	 * useful for systems where and I2S bus with multiple data

	 * lines is mastered.

	 */

	int max_channels_clocked[ARIZONA_MAX_AIF];



	/** GPIO for mic detection polarity */

	int micd_pol_gpio;

sound/soc/codecs/arizona.c

+12 −2
Original line number Diff line number Diff line
@@ -762,18 +762,28 @@ static int arizona_hw_params(struct snd_pcm_substream *substream, 
			     struct snd_soc_dai *dai)

{

	struct snd_soc_codec *codec = dai->codec;

	struct arizona_priv *priv = snd_soc_codec_get_drvdata(codec);

	struct arizona *arizona = priv->arizona;

	int base = dai->driver->base;

	const int *rates;

	int i, ret;

	int bclk, lrclk, wl, frame;

	int chan_limit = arizona->pdata.max_channels_clocked[dai->id - 1];

	int bclk, lrclk, wl, frame, bclk_target;



	if (params_rate(params) % 8000)

		rates = &arizona_44k1_bclk_rates[0];

	else

		rates = &arizona_48k_bclk_rates[0];



	bclk_target = snd_soc_params_to_bclk(params);

	if (chan_limit && chan_limit < params_channels(params)) {

		arizona_aif_dbg(dai, "Limiting to %d channels\n", chan_limit);

		bclk_target /= params_channels(params);

		bclk_target *= chan_limit;

	}



	for (i = 0; i < ARRAY_SIZE(arizona_44k1_bclk_rates); i++) {

		if (rates[i] >= snd_soc_params_to_bclk(params) &&

		if (rates[i] >= bclk_target &&

		    rates[i] % params_rate(params) == 0) {

			bclk = i;

			break;