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

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Date:	Thu, 27 Mar 2014 02:13:48 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	"guangyu.chen@...escale.com" <guangyu.chen@...escale.com>,
	"broonie@...nel.org" <broonie@...nel.org>
CC:	"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

> +	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 ?


Thanks,
--

Best Regards,
Xiubo

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