From: Nicolin Chen
> It's quite cricial to clear error flags because SAI might hang if getting
> FIFO underrun during playback (I haven't confirmed the same issue on Rx
> overflow though).
>
> So this patch enables those irq and adds isr() to clear the flags so as to
> keep playback entirely safe.
>
> Signed-off-by: Nicolin Chen <guangyu.c...@freescale.com>
> ---
> sound/soc/fsl/fsl_sai.c | 69
> ++++++++++++++++++++++++++++++++++++++++++++++---
> sound/soc/fsl/fsl_sai.h | 9 +++++++
> 2 files changed, 75 insertions(+), 3 deletions(-)
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index c4a4231..5f91aff 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -23,6 +23,55 @@
>
> #include "fsl_sai.h"
>
> +#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
> + FSL_SAI_CSR_FEIE |\
> + FSL_SAI_CSR_FWIE)
> +
> +static irqreturn_t fsl_sai_isr(int irq, void *devid)
> +{
> + struct fsl_sai *sai = (struct fsl_sai *)devid;
> + struct device *dev = &sai->pdev->dev;
> + u32 xcsr;
> +
> + regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
> + regmap_write(sai->regmap, FSL_SAI_TCSR, xcsr);
Assuming these are 'write to clear' bits, you might want
to make the write (above) and all the traces (below)
conditional on the value being non-zero.
> + 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");
> +
> + 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");
Some of those look like 'normal' interrupts, others are clearly
abnormal conditions.
Maybe the tracing should reflect this.
> +
> + regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr);
> + regmap_write(sai->regmap, FSL_SAI_RCSR, xcsr);
Same comments apply...
David
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