[alsa-devel] [2.6.30-rc2][PATCH 1/2] ASoC: OMAP: Fix DSP_B format in OMAP McBSP DAI driver
getarunks at gmail.com
Fri Apr 17 11:16:34 CEST 2009
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
>> 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
>> * 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.
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