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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: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-01-17 16:35:14 +09:00
parent f2c26d48d9
commit c94aa30eda
2 changed files with 21 additions and 2 deletions
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9
include/linux/mfd/arizona/pdata.h
View File

@ -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;

14
sound/soc/codecs/arizona.c
View File

@ -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;