From 5b66aa2d0cafd8093e0b8959d32e694c92390b8c Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Thu, 4 Oct 2012 15:08:41 +0200 Subject: [PATCH] ASoC: McASP: make AHCLK direction configurable Add a .set_sysclk function to pass the direction of the clock down to the driver. Only enable AHCLKX in the PDIR register when the CPU is driving the clock. This also removes the modification of the AHCLKXE/AHCLKRE bits in the hw_params callback, and users must set the desired configuration using snd_soc_dai_set_sysclk(), which this patch also does for the only user in mainline (davinci-evm). Signed-off-by: Daniel Mack Signed-off-by: Mark Brown --- sound/soc/davinci/davinci-evm.c | 5 +++++ sound/soc/davinci/davinci-mcasp.c | 26 ++++++++++++++++++++------ 2 files changed, 25 insertions(+), 6 deletions(-) diff --git a/sound/soc/davinci/davinci-evm.c b/sound/soc/davinci/davinci-evm.c index 6fac5af..d55e647 100644 --- a/sound/soc/davinci/davinci-evm.c +++ b/sound/soc/davinci/davinci-evm.c @@ -71,6 +71,11 @@ static int evm_hw_params(struct snd_pcm_substream *substream, if (ret < 0) return ret; + /* set the CPU system clock */ + ret = snd_soc_dai_set_sysclk(cpu_dai, 0, sysclk, SND_SOC_CLOCK_OUT); + if (ret < 0) + return ret; + return 0; } diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 9b1920e..9f7c2e1 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -486,8 +486,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_set_bits(base + DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE); mcasp_set_bits(base + DAVINCI_MCASP_RXFMCTL_REG, AFSRE); - mcasp_set_bits(base + DAVINCI_MCASP_PDIR_REG, - ACLKX | AHCLKX | AFSX); + mcasp_set_bits(base + DAVINCI_MCASP_PDIR_REG, ACLKX | AFSX); break; case SND_SOC_DAIFMT_CBM_CFS: /* codec is clock master and frame slave */ @@ -584,6 +583,24 @@ static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div return 0; } +static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id, + unsigned int freq, int dir) +{ + struct davinci_audio_dev *dev = snd_soc_dai_get_drvdata(dai); + + if (dir == SND_SOC_CLOCK_OUT) { + mcasp_set_bits(dev->base + DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE); + mcasp_set_bits(dev->base + DAVINCI_MCASP_AHCLKRCTL_REG, AHCLKRE); + mcasp_set_bits(dev->base + DAVINCI_MCASP_PDIR_REG, AHCLKX); + } else { + mcasp_clr_bits(dev->base + DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE); + mcasp_clr_bits(dev->base + DAVINCI_MCASP_AHCLKRCTL_REG, AHCLKRE); + mcasp_clr_bits(dev->base + DAVINCI_MCASP_PDIR_REG, AHCLKX); + } + + return 0; +} + static int davinci_config_channel_size(struct davinci_audio_dev *dev, int channel_size) { @@ -739,8 +756,6 @@ static void davinci_hw_param(struct davinci_audio_dev *dev, int stream) if (stream == SNDRV_PCM_STREAM_PLAYBACK) { /* bit stream is MSB first with no delay */ /* DSP_B mode */ - mcasp_set_bits(dev->base + DAVINCI_MCASP_AHCLKXCTL_REG, - AHCLKXE); mcasp_set_reg(dev->base + DAVINCI_MCASP_TXTDM_REG, mask); mcasp_set_bits(dev->base + DAVINCI_MCASP_TXFMT_REG, TXORD); @@ -756,8 +771,6 @@ static void davinci_hw_param(struct davinci_audio_dev *dev, int stream) /* bit stream is MSB first with no delay */ /* DSP_B mode */ mcasp_set_bits(dev->base + DAVINCI_MCASP_RXFMT_REG, RXORD); - mcasp_set_bits(dev->base + DAVINCI_MCASP_AHCLKRCTL_REG, - AHCLKRE); mcasp_set_reg(dev->base + DAVINCI_MCASP_RXTDM_REG, mask); if ((dev->tdm_slots >= 2) && (dev->tdm_slots <= 32)) @@ -911,6 +924,7 @@ static const struct snd_soc_dai_ops davinci_mcasp_dai_ops = { .hw_params = davinci_mcasp_hw_params, .set_fmt = davinci_mcasp_set_dai_fmt, .set_clkdiv = davinci_mcasp_set_clkdiv, + .set_sysclk = davinci_mcasp_set_sysclk, }; #define DAVINCI_MCASP_PCM_FMTS (SNDRV_PCM_FMTBIT_S8 | \ -- 2.7.4