Hello,
On Thursday 24 September 2009 20:06:07 ext Rick Bronson wrote:
Hi,
I'm working on getting a WM8731 (in SLAVE) working using I2S on omap3 McBSP2 (in MASTER).
static int omap3csb740_hw_params(struct snd_pcm_substream *substream, ... ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); ret = snd_soc_dai_set_sysclk(codec_dai, 0, 12288000, SND_SOC_CLOCK_IN); ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT, 0, SND_SOC_CLOCK_IN);
I think the problem is here. The MCBSP_CLKS pin is connected to CLK256FS pin of TWL4030 (or TPA). Since you are not using the TWL codec, there will be no clock on the MCBSP_CLKS pin, thus no functional clock for McBSP, thus no bits are shifted in or out. You can try to use the internal functional clock:
ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_FCLK, 0, SND_SOC_CLOCK_IN);
Than set the correct divider, which depends on the frequency you would like to play. The source for the CLKS_FCLK is (in case of McBSP2) PER_96M_FCLK, so 96MHz. Now you have to divide this to get the correct value, as I recall quite a long time ago there were some discussion about this here, and I have sent some 'formula' to calculate it, but I can not find it now :(
ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 256);
Any help is greatly appreciated.
Rick Bronson