linux-kernel - Re: [PATCH v2 4/6] mfd: atmel-hlcdc: return in case of error

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Date:   Mon, 16 Dec 2019 16:24:06 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     sam@...nborg.org, bbrezillon@...nel.org, airlied@...ux.ie,
        daniel@...ll.ch, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, ludovic.desroches@...rochip.com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] mfd: atmel-hlcdc: return in case of error

On Fri, 13 Dec 2019, Claudiu Beznea wrote:

> For HLCDC timing engine configurations bit ATMEL_HLCDC_SIP of
> ATMEL_HLCDC_SR needs to be polled before applying new config. In case of
> timeout there is no indicator about this, so, return in case of timeout
> and also print a message about this.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
>  drivers/mfd/atmel-hlcdc.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
> index 92bfcaa62ace..a1e46c87b956 100644
> --- a/drivers/mfd/atmel-hlcdc.c
> +++ b/drivers/mfd/atmel-hlcdc.c
> @@ -40,10 +40,17 @@ static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
>  
>  	if (reg <= ATMEL_HLCDC_DIS) {
>  		u32 status;
> -
> -		readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
> -					  status, !(status & ATMEL_HLCDC_SIP),
> -					  1, 100);
> +		int ret;
> +
> +		ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
> +						status,
> +						!(status & ATMEL_HLCDC_SIP),
> +						1, 100);
> +		if (ret) {
> +			dev_err(hregmap->dev,
> +				"Timeout waiting for ATMEL_HLCDC_SIP\n");

Nit: Just in case you have to rework this, placing register names in
the kernel log isn't usually helpful.  Can you swap it out for a more
user friendly message?

"Timed out waiting for ..."

... X status
... Y to update
... setting Z configuration

Etc.

> +			return ret;
> +		}
>  	}
>  
>  	writel(val, hregmap->regs + reg);

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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