Commit 6aababdf authored by Daniel Mack's avatar Daniel Mack Committed by Mark Brown
Browse files

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: default avatarDaniel Mack <daniel@caiaq.de>
Acked-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 738ada47

sound/soc/codecs/cs4270.c

+25 −13
Original line number Diff line number Diff line
@@ -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)
@@ -213,6 +218,7 @@ static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, 


	cs4270->mclk = freq;



	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);
@@ -228,6 +234,12 @@ static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, 
			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;

	codec_dai->playback.rate_min = rate_min;

CRA Git | Maintained and supported by SUSTech CRA and CCSE