linux-kernel - Re: [PATCH] mtd: rawnand: denali: remove ->erase hook

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Date:   Mon, 21 Jan 2019 09:10:13 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] mtd: rawnand: denali: remove ->erase hook

On Mon, 21 Jan 2019 13:52:06 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> Commit f9ebd1bb4103 ("mtd: rawnand: Deprecate ->erase()") discouraged
> the use of this hook, so I am happy to follow the suggestion.
> 
> Although the Denali IP provides a special MAP10 command for erasing,
> using it would not buy us much. The Denali IP actually works with the
> generic erasing by single_erase() + ->cmdfunc hook (nand_command_lp)
> + ->cmd_ctrl hook (denali_cmd_ctrl).
> 
> This method is also deprecated, but denali_erase() can go away
> irrespective of ->exec_op conversion.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Reviewed-by: Boris Brezillon <bbrezillon@...nel.org>

> ---
> 
>  drivers/mtd/nand/raw/denali.c | 21 ---------------------
>  1 file changed, 21 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
> index 6e8edc9..21320b1 100644
> --- a/drivers/mtd/nand/raw/denali.c
> +++ b/drivers/mtd/nand/raw/denali.c
> @@ -37,9 +37,6 @@
>  #define DENALI_MAP11_ADDR	((DENALI_MAP11) | 1)	/* address cycle */
>  #define DENALI_MAP11_DATA	((DENALI_MAP11) | 2)	/* data cycle */
>  
> -/* MAP10 commands */
> -#define DENALI_ERASE		0x01
> -
>  #define DENALI_BANK(denali)	((denali)->active_bank << 24)
>  
>  #define DENALI_INVALID_BANK	-1
> @@ -903,23 +900,6 @@ static int denali_waitfunc(struct nand_chip *chip)
>  	return irq_status & INTR__INT_ACT ? 0 : NAND_STATUS_FAIL;
>  }
>  
> -static int denali_erase(struct nand_chip *chip, int page)
> -{
> -	struct denali_nand_info *denali = mtd_to_denali(nand_to_mtd(chip));
> -	uint32_t irq_status;
> -
> -	denali_reset_irq(denali);
> -
> -	denali->host_write(denali, DENALI_MAP10 | DENALI_BANK(denali) | page,
> -			   DENALI_ERASE);
> -
> -	/* wait for erase to complete or failure to occur */
> -	irq_status = denali_wait_for_irq(denali,
> -					 INTR__ERASE_COMP | INTR__ERASE_FAIL);
> -
> -	return irq_status & INTR__ERASE_COMP ? 0 : -EIO;
> -}
> -
>  static int denali_setup_data_interface(struct nand_chip *chip, int chipnr,
>  				       const struct nand_data_interface *conf)
>  {
> @@ -1244,7 +1224,6 @@ static int denali_attach_chip(struct nand_chip *chip)
>  	chip->ecc.write_page_raw = denali_write_page_raw;
>  	chip->ecc.read_oob = denali_read_oob;
>  	chip->ecc.write_oob = denali_write_oob;
> -	chip->legacy.erase = denali_erase;
>  
>  	ret = denali_multidev_fixup(denali);
>  	if (ret)