[PATCH] ASoC: fsl_sai: Add isr to deal with error flag

[Li.Xiubo at freescale.com]

> On Thu, Mar 27, 2014 at 10:13:48AM +0800, Xiubo Li-B47053 wrote:
> > > +	regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
> > > +	regmap_write(sai->regmap, FSL_SAI_TCSR, xcsr);
> > > +
> > > +	if (xcsr & FSL_SAI_CSR_WSF)
> > > +		dev_dbg(dev, "isr: Start of Tx word detected\n");
> > > +
> > > +	if (xcsr & FSL_SAI_CSR_SEF)
> > > +		dev_dbg(dev, "isr: Tx Frame sync error detected\n");
> > > +
> > > +	if (xcsr & FSL_SAI_CSR_FEF)
> > > +		dev_dbg(dev, "isr: Transmit underrun detected\n");
> > > +
> >
> > Actually, the above three isrs should to write a logic 1 to this field
> > to clear this flag.
> >
> >
> > > +	if (xcsr & FSL_SAI_CSR_FWF)
> > > +		dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");
> > > +
> > > +	if (xcsr & FSL_SAI_CSR_FRF)
> > > +		dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");
> > > +
> >
> > While are these ones really needed to clear manually ?
> 
> The reference manual doesn't mention about the requirement. So SAI should do
> the self-clearance.

Yes, I do think we should let it do the self-clearance, and shouldn't interfere
of them...