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authorAlexander Sverdlin <subaparts@yandex.ru>2011-03-07 20:29:53 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-03-09 13:08:32 +0000
commit6d33cd771b779abd8faeaf63821c200ba36a63b1 (patch)
tree6b05d7274922a94dbe9e7c5ee058328092047c23 /sound/soc/ep93xx
parent5c3a12e96c9f3158602b2feac8583ae35c10b80e (diff)
downloadlinux-6d33cd771b779abd8faeaf63821c200ba36a63b1.tar.bz2
ASoC: EDB93xx: Manage I2S rates according to datasheet for CS4271 CODEC.
Manage I2S rates according to datasheet for CS4271 CODEC in EDB93xx machine driver. Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru> Acked-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/ep93xx')
-rw-r--r--sound/soc/ep93xx/edb93xx.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/sound/soc/ep93xx/edb93xx.c b/sound/soc/ep93xx/edb93xx.c
index b270085227f3..d3aa15119d26 100644
--- a/sound/soc/ep93xx/edb93xx.c
+++ b/sound/soc/ep93xx/edb93xx.c
@@ -41,17 +41,17 @@ static int edb93xx_hw_params(struct snd_pcm_substream *substream,
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int err;
+ unsigned int mclk_rate;
unsigned int rate = params_rate(params);
+
/*
- * We set LRCLK equal to `rate' and SCLK = LRCLK * 64,
- * because our sample size is 32 bit * 2 channels.
- * I2S standard permits us to transmit more bits than
- * the codec uses.
- * MCLK = SCLK * 4 is the best recommended value,
- * but we have to fall back to ratio 2 for higher
- * sample rates.
+ * According to CS4271 datasheet we use MCLK/LRCK=256 for
+ * rates below 50kHz and 128 for higher sample rates
*/
- unsigned int mclk_rate = rate * 64 * ((rate <= 48000) ? 4 : 2);
+ if (rate < 50000)
+ mclk_rate = rate * 64 * 4;
+ else
+ mclk_rate = rate * 64 * 2;
err = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_IF |