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iio: adc: at91-sama5d2_adc: ack DRDY irq in direct mode 

Need to acknowledge DRDY irq in direct mode/ software
triggered mode. Otherwise, on the next conversion, overrun
flag will be raised, which is not a correct state.
This doesn't affect the functionality, but will generate
possible incorrect overrun reports.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Eugen Hristev 2017-11-15 14:56:48 +02:00 committed by Jonathan Cameron
parent 073c662017
commit 10c7a314c9
1 changed files with 3 additions and 0 deletions
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drivers/iio/adc/at91-sama5d2_adc.c
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@ -786,6 +786,9 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
at91_adc_writel(st, AT91_SAMA5D2_IDR, BIT(chan->channel));
at91_adc_writel(st, AT91_SAMA5D2_CHDR, BIT(chan->channel));
/* Needed to ACK the DRDY interruption */
at91_adc_readl(st, AT91_SAMA5D2_LCDR);
mutex_unlock(&st->lock);
iio_device_release_direct_mode(indio_dev);