[alsa-devel] [PATCH] ASoC: DaVinci: Fixes to McASP configuration

[Chaithrika U S]

On Thu, Sep 17, 2009 at 01:48:19, Mark Brown wrote:
> On Tue, Sep 15, 2009 at 06:13:29PM -0400, Chaithrika U S wrote:
> > McASP register settings are not correct for DSP mode of operation.
> > There is a channel swap initally. This patch provides fixes to
> > the register values for proper working.
> 
> Adding Troy since he's been looking at some L/R swap issues.  Does this
> only apply in DSP mode or does it affect all modes (your commit message
> isn't terribly clear on that one)?
> 
Mark,

May be my commit message is misleading. Currently, McASP is configured 
for DSP mode and I have tested for that mode.

Regards, 
Chaithrika
> > Tested on DA830/OMAP-L137 EVM, DM6467 EVM.
> 
> > Signed-off-by: Chaithrika U S <chaithrika at ti.com>
> 
> > Applies to ALSA GIT tree on branch topic/asoc at
> > http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git;a=shortlog;
> > h=topic/asoc
> > 
> >  sound/soc/davinci/davinci-mcasp.c |   24 ++++++++++++++++++++++--
> >  1 files changed, 22 insertions(+), 2 deletions(-)
> > 
> > diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
> > index eca22d7..7a06c0a 100644
> > --- a/sound/soc/davinci/davinci-mcasp.c
> > +++ b/sound/soc/davinci/davinci-mcasp.c
> > @@ -512,34 +512,49 @@ static int davinci_config_channel_size(struct davinci_audio_dev *dev,
> >  				       int channel_size)
> >  {
> >  	u32 fmt = 0;
> > +	u32 mask, rotate;
> >  
> >  	switch (channel_size) {
> >  	case DAVINCI_AUDIO_WORD_8:
> >  		fmt = 0x03;
> > +		rotate = 6;
> > +		mask = 0x000000ff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_12:
> >  		fmt = 0x05;
> > +		rotate = 5;
> > +		mask = 0x00000fff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_16:
> >  		fmt = 0x07;
> > +		rotate = 4;
> > +		mask = 0x0000ffff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_20:
> >  		fmt = 0x09;
> > +		rotate = 3;
> > +		mask = 0x000fffff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_24:
> >  		fmt = 0x0B;
> > +		rotate = 2;
> > +		mask = 0x00ffffff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_28:
> >  		fmt = 0x0D;
> > +		rotate = 1;
> > +		mask = 0x0fffffff;
> >  		break;
> >  
> >  	case DAVINCI_AUDIO_WORD_32:
> >  		fmt = 0x0F;
> > +		rotate = 0;
> > +		mask = 0xffffffff;
> >  		break;
> >  
> >  	default:
> > @@ -550,6 +565,13 @@ static int davinci_config_channel_size(struct davinci_audio_dev *dev,
> >  					RXSSZ(fmt), RXSSZ(0x0F));
> >  	mcasp_mod_bits(dev->base + DAVINCI_MCASP_TXFMT_REG,
> >  					TXSSZ(fmt), TXSSZ(0x0F));
> > +	mcasp_mod_bits(dev->base + DAVINCI_MCASP_TXFMT_REG, TXROT(rotate),
> > +							TXROT(7));
> > +	mcasp_mod_bits(dev->base + DAVINCI_MCASP_RXFMT_REG, RXROT(rotate),
> > +							RXROT(7));
> > +	mcasp_set_reg(dev->base + DAVINCI_MCASP_TXMASK_REG, mask);
> > +	mcasp_set_reg(dev->base + DAVINCI_MCASP_RXMASK_REG, mask);
> > +
> >  	return 0;
> >  }
> >  
> > @@ -638,7 +660,6 @@ static void davinci_hw_param(struct davinci_audio_dev *dev, int stream)
> >  			printk(KERN_ERR "playback tdm slot %d not supported\n",
> >  				dev->tdm_slots);
> >  
> > -		mcasp_set_reg(dev->base + DAVINCI_MCASP_TXMASK_REG, 0xFFFFFFFF);
> >  		mcasp_clr_bits(dev->base + DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
> >  	} else {
> >  		/* bit stream is MSB first with no delay */
> > @@ -655,7 +676,6 @@ static void davinci_hw_param(struct davinci_audio_dev *dev, int stream)
> >  			printk(KERN_ERR "capture tdm slot %d not supported\n",
> >  				dev->tdm_slots);
> >  
> > -		mcasp_set_reg(dev->base + DAVINCI_MCASP_RXMASK_REG, 0xFFFFFFFF);
> >  		mcasp_clr_bits(dev->base + DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
> >  	}
> >  }
> > -- 
> > 1.5.6
> > 
>