[alsa-devel] [PATCH 09/20] OMAP3: McBSP: Lower the maximum buffersize for McBSP1, 3, 4, 5

[Eduardo Valentin]

On Thu, Jul 30, 2009 at 08:57:21PM +0200, ext Jarkko Nikula wrote:
> On Thu, 30 Jul 2009 15:49:32 +0300
> Eduardo Valentin <eduardo.valentin at nokia.com> wrote:
> 
> > From: Peter Ujfalusi <peter.ujfalusi at nokia.com>
> > 
> > Do not allow applications to use the full buffer found on
> > McBSP1,3,4,5. Using the full buffer in threshold mode causes
> > the McBSP buffer to run dry, which can be observed as channels
> > are switching (in reality the channels are shifting).
> > 
> ...
> > --- a/arch/arm/mach-omap2/mcbsp.c
> > +++ b/arch/arm/mach-omap2/mcbsp.c
> > @@ -129,7 +129,7 @@ static struct omap_mcbsp_platform_data
> > omap34xx_mcbsp_pdata[] = { .rx_irq		=
> > INT_24XX_MCBSP1_IRQ_RX, .tx_irq		=
> > INT_24XX_MCBSP1_IRQ_TX, .ops		= &omap2_mcbsp_ops,
> > -		.buffer_size	= 0x7F,
> > +		.buffer_size	= 0x6F,
> >  	},
> 
> Is it possible that also McBSP2 would require that maximum burst
> transmit size should be 0x10 smaller than size of internal buffer/fifo?

That's already not at full size. There is room for 1024+256 places on mcbsp2.

> 
> -- 
> Jarkko

-- 
Eduardo Valentin
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