[alsa-devel] [2.6.30-rc2][PATCH 1/2] ASoC: OMAP: Fix DSP_B format in OMAP McBSP DAI driver

[Arun KS]

On Fri, Apr 17, 2009 at 12:29 PM, Jarkko Nikula <jarkko.nikula at nokia.com> wrote:
> On Thu, 16 Apr 2009 23:35:20 +0200
> ext Troy Kisky <troy.kisky at boundarydevices.com> wrote:
>
>> Arun KS wrote:
>> > But when I2S is used there is no audio on Right channel(left channel
>> > is working fine).
>> > Thinks something is missing on tlv320aic23 driver.
>> >
>> This sounds like the same problem Davinci has. From a comment in
>> davinci-i2s.c
>>
>> case SND_SOC_DAIFMT_I2S:
>>         /* Davinci doesn't support TRUE I2S, but some codecs will have
>>          * the left and right channels contiguous. This allows
>>          * dsp_a mode to be used with an inverted normal frame clk.
>>          * If your codec is master and does not have contiguous
>>          * channels, then you will have sound on only one channel.
>>          * Try using a different mode, or codec as slave.
>>          *
>>          * The TLV320AIC33 is an example of a codec where this works.
>>          * It has a variable bit clock frequency allowing it to have
>>          * valid data on every bit clock.
>>          *
>>          * The TLV320AIC23 is an example of a codec where this does
>> not
>>          * work. It has a fixed bit clock frequency with progressively
>>          * more empty bit clock slots between channels as the sample
>>          * rate is lowered.
>>          */
>
> Interesting codec. Arun, how is the right channel working with I2S if
> you try to run with higher rate? E.g. aplay -r [48000 |
> 96000] /dev/urandom

Its the same. Right channel remains blank and left channel is playing.

>
> The I2S mode setup in tlv320aic23_set_dai_fmt looks correct.
>
>
> Jarkko
>