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authorJulian Scheel <julian@jusst.de>2015-06-12 15:57:32 +0200
committerMark Brown <broonie@kernel.org>2015-06-12 17:16:57 +0100
commitef5294fd250adc8c340ffeb410b62e1b777ddf6f (patch)
treee03b77e9163d9c9995d62babf4edea8d90a54e1a /sound/soc/codecs
parentb787f68c36d49bb1d9236f403813641efa74a031 (diff)
downloadlinux-stericsson-ef5294fd250adc8c340ffeb410b62e1b777ddf6f.tar.gz
ASoC: wm8523: Set bclk ratio for master mode
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>
Diffstat (limited to 'sound/soc/codecs')
-rw-r--r--sound/soc/codecs/wm8523.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8523.c b/sound/soc/codecs/wm8523.c
index b1cc94f5fc4b..f9dffd2d5eea 100644
--- a/sound/soc/codecs/wm8523.c
+++ b/sound/soc/codecs/wm8523.c
@@ -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: