linux-kernel - Re: [PATCH 5/5] iio: stmpe-adc: Reset possible interrupts

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Message-ID: <20190511112429.25ddd84d@archlinux>
Date:   Sat, 11 May 2019 11:24:29 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Philippe Schenker <dev@...henker.ch>
Cc:     linux-iio@...r.kernel.org, Stefan Agner <stefan@...er.ch>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        David Laight <David.Laight@...LAB.COM>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/5] iio: stmpe-adc: Reset possible interrupts

On Tue,  7 May 2019 16:36:15 +0200
Philippe Schenker <dev@...henker.ch> wrote:

> From: Philippe Schenker <philippe.schenker@...adex.com>
> 
> Clear any interrupt that still is on the device on every channel
> this driver is activated for in probe and specific channels in
> the timeout handler.
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
I'm never particularly clean on blanket resets as they do tend to
hide bugs. However, the probe one is something that would happen anyway
if there was a 'reset' function.

Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> 
> ---
> 
>  drivers/iio/adc/stmpe-adc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
> index cc752a47444c..a5990e9f2c80 100644
> --- a/drivers/iio/adc/stmpe-adc.c
> +++ b/drivers/iio/adc/stmpe-adc.c
> @@ -80,6 +80,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
>  	ret = wait_for_completion_timeout(&info->completion, STMPE_ADC_TIMEOUT);
>  
>  	if (ret <= 0) {
> +		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,
> +				STMPE_ADC_CH(info->channel));
>  		mutex_unlock(&info->lock);
>  		return -ETIMEDOUT;
>  	}
> @@ -326,6 +328,9 @@ static int stmpe_adc_probe(struct platform_device *pdev)
>  	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,
>  			~(norequest_mask & 0xFF));
>  
> +	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,
> +			~(norequest_mask & 0xFF));
> +
>  	return devm_iio_device_register(&pdev->dev, indio_dev);
>  }
>