linux-kernel - RE: [PATCH] ASoC: fsl_sai: Add isr to deal with error flag

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Message-ID: <12f887b3889a41849026965f0cf7db1f@BY2PR03MB505.namprd03.prod.outlook.com>
Date:	Thu, 27 Mar 2014 03:41:02 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	"guangyu.chen@...escale.com" <guangyu.chen@...escale.com>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: RE: [PATCH] ASoC: fsl_sai: Add isr to deal with error flag


> Subject: Re: [PATCH] ASoC: fsl_sai: Add isr to deal with error flag
> 
> On Thu, Mar 27, 2014 at 10:53:50AM +0800, Xiubo Li-B47053 wrote:
> > > 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...
> 
> SAI is supposed to ignore the interference, isn't it?
> 

Maybe, but I'm not very sure.
And these bits are all writable and readable.



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