linux-kernel - Re: [PATCH 3/5] mfd: atmel-hlcdc: return in case of error

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Date:   Tue, 10 Dec 2019 21:37:16 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     bbrezillon@...nel.org, airlied@...ux.ie, daniel@...ll.ch,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        ludovic.desroches@...rochip.com, lee.jones@...aro.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mfd: atmel-hlcdc: return in case of error

Hi Claudiu.

On Tue, Dec 10, 2019 at 03:24:45PM +0200, Claudiu Beznea wrote:
> For HLCDC timing engine configurations bit ATMEL_HLCDC_SIP of
> ATMEL_HLCDC_SR needs to checked if it is equal with zero before applying
> new configuration to timing engine. In case of timeout there is no
> indicator about this, so, return with error in case of timeout in
> regmap_atmel_hlcdc_reg_write() and also print a message about this.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
>  drivers/mfd/atmel-hlcdc.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
> index 64013c57a920..19f1dbeb8bcd 100644
> --- a/drivers/mfd/atmel-hlcdc.c
> +++ b/drivers/mfd/atmel-hlcdc.c
> @@ -39,10 +39,16 @@ 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) {
> +			pr_err("Timeout waiting for ATMEL_HLCDC_SIP\n");
> +			return ret;
Consider adding device * to atmel_hlcdc_regmap - so you can use
dev_err() here. This makes it obvious what device this comes from.

	Sam

> +		}
>  	}
>  
>  	writel(val, hregmap->regs + reg);
> -- 
> 2.7.4