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ASoC: wm8523: Set bclk ratio for master mode

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When running in master mode the bclk divider must be configured to generate a
sane bitclock. Pick the smallest fs multiplicator, which can hold all
transmitted bits.

Signed-off-by: Julian Scheel <julian@jusst.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Julian Scheel 2015-06-12 15:57:32 +02:00 committed by Mark Brown
parent b787f68c36
commit ef5294fd25
1 changed files with 26 additions and 0 deletions
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26
sound/soc/codecs/wm8523.c
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@ -113,6 +113,15 @@ static struct {
{ 7, 1152 },
};
static struct {
int value;
int ratio;
} bclk_ratios[WM8523_NUM_RATES] = {
{ 2, 32 },
{ 3, 64 },
{ 4, 128 },
};
static int wm8523_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
@ -162,6 +171,23 @@ static int wm8523_hw_params(struct snd_pcm_substream *substream,
aifctrl2 &= ~WM8523_SR_MASK;
aifctrl2 |= lrclk_ratios[i].value;
if (aifctrl1 & WM8523_AIF_MSTR) {
/* Find a fs->bclk ratio */
for (i = 0; i < ARRAY_SIZE(bclk_ratios); i++)
if (params_width(params) * 2 <= bclk_ratios[i].ratio)
break;
if (i == ARRAY_SIZE(bclk_ratios)) {
dev_err(codec->dev,
"No matching BCLK/fs ratio for word length %d\n",
params_width(params));
return -EINVAL;
}
aifctrl2 &= ~WM8523_BCLKDIV_MASK;
aifctrl2 |= bclk_ratios[i].value << WM8523_BCLKDIV_SHIFT;
}
aifctrl1 &= ~WM8523_WL_MASK;
switch (params_width(params)) {
case 16: