[alsa-devel] Channel swapping issue on TI OMAP3/TWL4030

[ylin at mail.com]

> > I think you need to implement the PRCM compliant interrupt config to
> > check for McBSP underflow/overflow.
>
> I have implemented the interrupt handle for IRQ 17 for receive error
> and underflow/overflow.  However, the devices are running for 2 days
> without channel swapped.  I will keep them running.

Finally, after 4 days, we caught the problem again.  When channel is 
swapped, the IRQ is trigger with receive underrun (IRQ_STATUS_REG = 
0x171e).  And, from the status register, the transmit is overflow as 
well.  However, I didn't fill zero to one of the transmit channel, and 
couldn't tell if the playback is swap as well.  Any idea why underun 
happens, or any suggestion to fix it?

Thanks,
Ying