linux-kernel - Re: [PATCH v3 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume operation

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Date:   Tue, 10 Mar 2020 20:39:30 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Mason Yang <masonccyang@...c.com.tw>
Cc:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        frieder.schrempf@...tron.de, tglx@...utronix.de, stefan@...er.ch,
        juliensu@...c.com.tw, allison@...utok.net,
        linux-kernel@...r.kernel.org, bbrezillon@...nel.org,
        rfontana@...hat.com, linux-mtd@...ts.infradead.org,
        yuehaibing@...wei.com, s.hauer@...gutronix.de
Subject: Re: [PATCH v3 3/4] mtd: rawnand: Add support manufacturer specific
 suspend/resume operation

On Tue,  3 Mar 2020 15:21:23 +0800
Mason Yang <masonccyang@...c.com.tw> wrote:

> Patch nand_suspend() & nand_resume() for manufacturer specific
> suspend/resume operation.
> 
> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
> Reported-by: kbuild test robot <lkp@...el.com>
> Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/mtd/nand/raw/nand_base.c | 11 ++++++++---
>  include/linux/mtd/rawnand.h      |  4 ++++
>  2 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 769be81..b44e460 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -4327,7 +4327,9 @@ static int nand_suspend(struct mtd_info *mtd)
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  
>  	mutex_lock(&chip->lock);
> -	chip->suspended = 1;
> +	if (chip->_suspend)
> +		if (!chip->_suspend(chip))
> +			chip->suspended = 1;
>  	mutex_unlock(&chip->lock);
>  
>  	return 0;
> @@ -4342,11 +4344,14 @@ static void nand_resume(struct mtd_info *mtd)
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  
>  	mutex_lock(&chip->lock);
> -	if (chip->suspended)
> +	if (chip->suspended) {
> +		if (chip->_resume)
> +			chip->_resume(chip);
>  		chip->suspended = 0;
> -	else
> +	} else {
>  		pr_err("%s called for a chip which is not in suspended state\n",
>  			__func__);
> +	}
>  	mutex_unlock(&chip->lock);
>  }
>  
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index bc2fa3c..c0055ed 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -1064,6 +1064,8 @@ struct nand_legacy {
>   * @lock:		lock protecting the suspended field. Also used to
>   *			serialize accesses to the NAND device.
>   * @suspended:		set to 1 when the device is suspended, 0 when it's not.
> + * @_suspend:		[REPLACEABLE] specific NAND device suspend operation
> + * @_resume:		[REPLACEABLE] specific NAND device resume operation

Given you added 4 more methods in this series, I think now would be a
good time to introduce a nand_chip_ops struct grouping all ops together.

>   * @bbt:		[INTERN] bad block table pointer
>   * @bbt_td:		[REPLACEABLE] bad block table descriptor for flash
>   *			lookup.
> @@ -1119,6 +1121,8 @@ struct nand_chip {
>  
>  	struct mutex lock;
>  	unsigned int suspended : 1;
> +	int (*_suspend)(struct nand_chip *chip);
> +	void (*_resume)(struct nand_chip *chip);
>  
>  	uint8_t *oob_poi;
>  	struct nand_controller *controller;