From 6aababdf20bb8892023bb8df136514d7679e4959 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Fri, 15 Jan 2010 17:36:48 +0100 Subject: 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 Acked-by: Timur Tabi Signed-off-by: Mark Brown --- sound/soc/codecs/cs4270.c | 38 +++++++++++++++++++++++++------------- 1 file changed, 25 insertions(+), 13 deletions(-) (limited to 'sound') diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c index 8b5457542a0..593bfc7a698 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; -- cgit v1.2.3