From: David Brownell <[email protected]> Let's have audio playback not sound like chipmunks, 'k? :)
ASP1 on the DM355 EVM uses a 27 MHz external audio clock, not the slower clock used with ASP0 on the DM6446 EVM. Also, that slower ASP0 clock on the DM6446 is 12.288 MHz, not 22.5792 MHz ... 48 KHz sample rate (x256), not a double speed 44.1 KHz sample rate (which could be done, but isn't what the board init code now sets up). Signed-off-by: David Brownell <[email protected]> --- NOTE: Other ASoC patches for the DM355 EVM are blocked on DM355 support getting to mainline; this one doesn't need to be. Tested by playing back "dedodedo.wav" and an ogg file; mp3 and an ".au" file wedged. I'd cc the ALSA list but it's allegedly subscribers-only... sound/soc/davinci/davinci-evm.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) --- a/sound/soc/davinci/davinci-evm.c +++ b/sound/soc/davinci/davinci-evm.c @@ -29,7 +29,6 @@ #include "davinci-pcm.h" #include "davinci-i2s.h" -#define EVM_CODEC_CLOCK 22579200 static int evm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) @@ -38,6 +37,21 @@ static int evm_hw_params(struct snd_pcm_ struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; int ret = 0; + unsigned sysclk; + + /* ASP1 on DM355 EVM is clocked by an external oscillator */ + if (machine_is_davinci_dm355_evm()) + sysclk = 27000000; + + /* ASP0 in DM6446 EVM is clocked by U55, as configured by + * board-dm644x-evm.c using GPIOs from U18. There are six + * options; here we "know" we use a 48 KHz sample rate. + */ + else if (machine_is_davinci_evm()) + sysclk = 12288000; + + else + return -EINVAL; /* set codec DAI configuration */ ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | @@ -52,8 +66,7 @@ static int evm_hw_params(struct snd_pcm_ return ret; /* set the codec system clock */ - ret = snd_soc_dai_set_sysclk(codec_dai, 0, EVM_CODEC_CLOCK, - SND_SOC_CLOCK_OUT); + ret = snd_soc_dai_set_sysclk(codec_dai, 0, sysclk, SND_SOC_CLOCK_OUT); if (ret < 0) return ret; _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
