[alsa-devel] [PATCH] ASoC: OMAP: Fix DSP DAI format in McBSP DAI driver

Jarkko Nikula jarkko.nikula at nokia.com
Wed Oct 22 12:59:37 CEST 2008

On Wed, 22 Oct 2008 11:29:36 +0100
"ext Mark Brown" <broonie at sirena.org.uk> wrote:

> On Wed, Oct 22, 2008 at 01:12:25PM +0300, Jarkko Nikula wrote:
> > > This is modifying what machine driver has chosen. AM I missing something?
> > Since as a McBSP sense, the normal polarities in DSP format (or
> > according to AIC33 DSP mode...) were different than in I2S. Idea is to
> > keep codec and cpu configuration in sync in the machine driver, i.e.
> > same bit clock and frame sync polarity configuration
> Hrm - this suggests that one or more of your codec drivers may be
> getting this wrong.  I would expect that the inversion of bit and frame
> clocks should be with respect to the normal behaviour of the mode, not
> with respect to I2S mode.

Yep, that was the idea. As I told before I made this patch according
to DSP mode of AIC33 which seems to be somewhat near DSP_B but not the
the same e.g. what WM9713 is using. So at least have to do some changes
into AIC33 driver to not claim to support DSP_A.

Can you Arun test does the following fix on top of my original patch
work on OSK? My codec is Tektronix TDS2024 connected into Beagle
so cannot hear is it playing correctly :-)


diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 853b33a..4e86d52 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -265,7 +265,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 		regs->srgr2	|= FPER(wlen * 2 - 1);
-		regs->srgr1	|= FWID(0);
+		regs->srgr1	|= FWID(wlen * 2 - 2);
@@ -307,8 +307,6 @@ static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 		/* 0-bit data delay */
 		regs->rcr2      |= RDATDLY(0);
 		regs->xcr2      |= XDATDLY(0);
-		/* Invert bit clock and FS polarity configuration for DSP_A */
-		temp_fmt ^= SND_SOC_DAIFMT_IB_IF;
 		/* Unsupported data format */

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