linux-kernel - Re: [PATCH v3 4/4] iio: adc: at91-sama5d2

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Date:   Sun, 19 Nov 2017 11:28:19 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...e-electrons.com>,
        <linux-iio@...r.kernel.org>, <lars@...afoo.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ludovic.desroches@...rochip.com>
Subject: Re: [PATCH v3 4/4] iio: adc: at91-sama5d2_adc: ack DRDY irq in
 direct mode

On Wed, 15 Nov 2017 14:56:48 +0200
Eugen Hristev <eugen.hristev@...rochip.com> wrote:

> 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@...rochip.com>

Applied. Thanks.
> ---
>  drivers/iio/adc/at91-sama5d2_adc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index 11d34a8..274cb5e 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -787,6 +787,9 @@ 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);