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authorDaniel Mack <daniel@caiaq.de>2010-01-15 19:36:48 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-01-15 20:28:41 +0300
commit6aababdf20bb8892023bb8df136514d7679e4959 (patch)
tree4919145129a8b76b5bd94046da3b2a73beab4fdb /sound/soc/codecs/cs4270.c
parent738ada47cf60830d37bb70ffb0b0281d19fc4c7f (diff)
downloadlinux-6aababdf20bb8892023bb8df136514d7679e4959.tar.xz
ASoC: cs4270: allow passing freq=0 in set_dai_sysclk()
For setups with variable MCLKs, the current logic of limiting the available sampling rates at startup time is not sufficient. We need to be able to change the setting at a later point, and so the codec must offer all possible rates until the hw_params are given. This patches allows that by passing 0 as 'freq' argument to cs4270_set_dai_sysclk(). Signed-off-by: Daniel Mack <daniel@caiaq.de> Acked-by: Timur Tabi <timur@freescale.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/cs4270.c')
-rw-r--r--sound/soc/codecs/cs4270.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 8b5457542a0e..593bfc7a6986 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -200,6 +200,11 @@ static struct cs4270_mode_ratios cs4270_mode_ratios[] = {
* This function must be called by the machine driver's 'startup' function,
* otherwise the list of supported sample rates will not be available in
* time for ALSA.
+ *
+ * For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause
+ * theoretically possible sample rates to be enabled. Call it again with a
+ * proper value set one the external clock is set (most probably you would do
+ * that from a machine's driver 'hw_param' hook.
*/
static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
@@ -213,20 +218,27 @@ static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai,
cs4270->mclk = freq;
- for (i = 0; i < NUM_MCLK_RATIOS; i++) {
- unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
- rates |= snd_pcm_rate_to_rate_bit(rate);
- if (rate < rate_min)
- rate_min = rate;
- if (rate > rate_max)
- rate_max = rate;
- }
- /* FIXME: soc should support a rate list */
- rates &= ~SNDRV_PCM_RATE_KNOT;
+ if (cs4270->mclk) {
+ for (i = 0; i < NUM_MCLK_RATIOS; i++) {
+ unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
+ rates |= snd_pcm_rate_to_rate_bit(rate);
+ if (rate < rate_min)
+ rate_min = rate;
+ if (rate > rate_max)
+ rate_max = rate;
+ }
+ /* FIXME: soc should support a rate list */
+ rates &= ~SNDRV_PCM_RATE_KNOT;
- if (!rates) {
- dev_err(codec->dev, "could not find a valid sample rate\n");
- return -EINVAL;
+ if (!rates) {
+ dev_err(codec->dev, "could not find a valid sample rate\n");
+ return -EINVAL;
+ }
+ } else {
+ /* enable all possible rates */
+ rates = SNDRV_PCM_RATE_8000_192000;
+ rate_min = 8000;
+ rate_max = 192000;
}
codec_dai->playback.rates = rates;