linux-kernel - Re: [PATCH 2/2] mfd: atmel-flexcom: use resume

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Date:   Fri, 9 Jul 2021 11:12:15 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>,
        <lee.jones@...aro.org>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <romain.izard.pro@...il.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mfd: atmel-flexcom: use resume_noirq

On 05/07/2021 at 13:31, Claudiu Beznea wrote:
> Flexcom IP embeds 3 other IPs: usart, i2c, spi and selects the operation
> mode (usart, i2c, spi) via mode register (FLEX_MR). On i2c bus there might
> be connected critical devices (like PMIC) which on suspend/resume should
> be suspended/resumed at the end/beginning. i2c uses
> .suspend_noirq/.resume_noirq for this kind of purposes. Align flexcom
> to use .resume_noirq as it should be resumed before the embedded IPs.
> Otherwise the embedded devices might behave badly.
> 
> Fixes: 7fdec11015c3 ("atmel_flexcom: Support resuming after a chip reset")
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Thanks Claudiu, best regards,
   Nicolas

> ---
>   drivers/mfd/atmel-flexcom.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
> index 962f66dc8813..559eb4d352b6 100644
> --- a/drivers/mfd/atmel-flexcom.c
> +++ b/drivers/mfd/atmel-flexcom.c
> @@ -87,7 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
>   };
>   MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
>   
> -static int __maybe_unused atmel_flexcom_resume(struct device *dev)
> +static int __maybe_unused atmel_flexcom_resume_noirq(struct device *dev)
>   {
>   	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
>   	int err;
> @@ -105,8 +105,9 @@ static int __maybe_unused atmel_flexcom_resume(struct device *dev)
>   	return 0;
>   }
>   
> -static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
> -			 atmel_flexcom_resume);
> +static const struct dev_pm_ops atmel_flexcom_pm_ops = {
> +	.resume_noirq = atmel_flexcom_resume_noirq,
> +};
>   
>   static struct platform_driver atmel_flexcom_driver = {
>   	.probe	= atmel_flexcom_probe,
> 


-- 
Nicolas Ferre