Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6d33cd77 authored by Alexander Sverdlin's avatar Alexander Sverdlin Committed by Mark Brown
Browse files

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: default avatarAlexander Sverdlin <subaparts@yandex.ru>
Acked-by: default avatarLiam Girdwood <lrg@ti.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 5c3a12e9

sound/soc/ep93xx/edb93xx.c

+8 −8
Original line number Diff line number Diff line
@@ -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 |