[PATCH RFC v3 3/8] ASoC: davinci-mcasp: Set BCLK divider if McASP is BCLK master
From: Jyri Sarha <hidden>
Date: 2014-01-27 15:37:52
Also in:
alsa-devel, dri-devel, linux-omap
Subsystem:
sound, sound - soc layer / dynamic audio power management (asoc), the rest · Maintainers:
Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds
Make BCLK divider setting implicite in hw_params call if McASP device is the bit clock master on the audio serial bus. Signed-off-by: Jyri Sarha <redacted> --- sound/soc/davinci/davinci-mcasp.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index b7858bf..ae328be 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c@@ -53,6 +53,9 @@ struct davinci_mcasp { u16 bclk_lrclk_ratio; int streams; + int sysclk_freq; + bool bclk_master; + /* McASP FIFO related */ u8 txnumevt; u8 rxnumevt;
@@ -292,6 +295,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR); mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR); + mcasp->bclk_master = 1; break; case SND_SOC_DAIFMT_CBM_CFS: /* codec is clock master and frame slave */
@@ -303,6 +307,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR); mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR); + mcasp->bclk_master = 0; break; case SND_SOC_DAIFMT_CBM_CFM: /* codec is clock and frame master */
@@ -314,6 +319,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | AHCLKX | AFSX | ACLKR | AHCLKR | AFSR); + mcasp->bclk_master = 0; break; default:
@@ -405,6 +411,8 @@ static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX); } + mcasp->sysclk_freq = freq; + return 0; }
@@ -607,6 +615,18 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream, int channels; struct snd_interval *pcm_channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); + + /* If mcasp is BCLK master we need to set BCLK divider */ + if (mcasp->bclk_master) { + unsigned int bclk_freq = snd_soc_params_to_bclk(params); + if (mcasp->sysclk_freq % bclk_freq != 0) { + dev_err(mcasp->dev, "Can't produce requred BCLK\n"); + return -EINVAL; + } + davinci_mcasp_set_clkdiv( + cpu_dai, 1, mcasp->sysclk_freq / bclk_freq); + } + channels = pcm_channels->min; active_serializers = (channels + slots - 1) / slots;
--
1.7.9.5