From 05d5e991a7290807e7d62a7d272bb4f37c27c6ae Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sun, 4 Jan 2009 02:50:10 -0800 Subject: [PATCH] ASoC: Clocking fixes for davinci-evm.c 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 Signed-off-by: Mark Brown --- sound/soc/davinci/davinci-evm.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/sound/soc/davinci/davinci-evm.c b/sound/soc/davinci/davinci-evm.c index 01b948bb55a1..54851f318568 100644 --- a/sound/soc/davinci/davinci-evm.c +++ b/sound/soc/davinci/davinci-evm.c @@ -26,7 +26,6 @@ #include "davinci-pcm.h" #include "davinci-i2s.h" -#define EVM_CODEC_CLOCK 22579200 #define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B | \ SND_SOC_DAIFMT_CBM_CFM | SND_SOC_DAIFMT_IB_NF) @@ -37,6 +36,21 @@ static int evm_hw_params(struct snd_pcm_substream *substream, 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, AUDIO_FORMAT); @@ -49,8 +63,7 @@ static int evm_hw_params(struct snd_pcm_substream *substream, 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; -- 2.20.1