* Zubair Lutfullah | 2013-08-13 21:05:03 [+0100]:
>diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
>index 3ceac3e..0d7e313 100644
>--- a/drivers/iio/adc/ti_am335x_adc.c
>+++ b/drivers/iio/adc/ti_am335x_adc.c
>@@ -24,16 +24,28 @@
…
>+static irqreturn_t tiadc_irq(int irq, void *private)
>+{
>+ struct iio_dev *idev = private;
>+ struct tiadc_device *adc_dev = iio_priv(idev);
>+ unsigned int status, config;
>+ status = tiadc_readl(adc_dev, REG_IRQSTATUS);
>+
>+ /* FIFO Overrun. Clear flag. Disable/Enable ADC to recover */
>+ if (status & IRQENB_FIFO1OVRRUN) {
>+ config = tiadc_readl(adc_dev, REG_CTRL);
>+ config &= ~(CNTRLREG_TSCSSENB);
>+ tiadc_writel(adc_dev, REG_CTRL, config);
>+ tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1OVRRUN |
>+ IRQENB_FIFO1UNDRFLW | IRQENB_FIFO1THRES);
>+ tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB));
I have no idea how other handle this but shouldn't you somehow inform
*anyone* that you lost some samples due to this overrun?
>+ } else if (status & IRQENB_FIFO1THRES) {
>+ /* Wake adc_work that pushes FIFO data to iio buffer */
>+ tiadc_writel(adc_dev, REG_IRQCLR, IRQENB_FIFO1THRES);
>+ adc_dev->data_avail = 1;
>+ wake_up_interruptible(&adc_dev->wq_data_avail);
>+ } else
>+ return IRQ_NONE;
Sebastian
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