Re: [PATCH 1/3] mtd: rawnand: Add destructive operation

Re: [PATCH 1/3] mtd: rawnand: Add destructive operation

[Miquel Raynal]

Hi David,

dregan@mail.com wrote on Tue, 10 Oct 2023 04:46:00 +0200:

For the next iteration, would you mind sending the series with
git-send-email or at least handle the fact that patch 2 and 3 should be
an answer of patch 1 so that the three mails are kept together?

> Erase and program operations need the write protect (wp) pin to be
> de-asserted to take effect. Add the concept of destructive
> operation and pass the information to exec_op() so controllers know
> when they should de-assert this pin without having to decode
> the command opcode. Based on changes proposed by Boris Brezillon.
> 
> https://github.com/bbrezillon/linux/commit/e612e1f2c69a33ac5f2c91d13669f0f172d58717
> 
> Signed-off-by: David Regan <dregan@mail.com>

Given that there are almost no changes in this patch the author and
first SoB should remain Boris and you should add your SoB after.

> 
> ---
>  drivers/mtd/nand/raw/nand_base.c | 6 ++++--
>  include/linux/mtd/rawnand.h      | 9 +++++++++
>  2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index d4b55155aeae..47cc2c35153b 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -1494,7 +1494,8 @@ static int nand_exec_prog_page_op(struct nand_chip *chip, unsigned int page,
>  			    NAND_COMMON_TIMING_NS(conf, tWB_max)),
>  		NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tPROG_max), 0),
>  	};
> -	struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);
> +	struct nand_operation op = NAND_DESTRUCTIVE_OPERATION(chip->cur_cs,
> +							      instrs);
>  	int naddrs = nand_fill_column_cycles(chip, addrs, offset_in_page);
> 
>  	if (naddrs < 0)
> @@ -1917,7 +1918,8 @@ int nand_erase_op(struct nand_chip *chip, unsigned int eraseblock)
>  			NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tBERS_max),
>  					 0),
>  		};
> -		struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);
> +		struct nand_operation op = NAND_DESTRUCTIVE_OPERATION(chip->cur_cs,
> +								      instrs);
> 
>  		if (chip->options & NAND_ROW_ADDR_3)
>  			instrs[1].ctx.addr.naddrs++;
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index 90a141ba2a5a..31aceda8616c 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -1008,6 +1008,7 @@ struct nand_op_parser {
>   */
>  struct nand_operation {
>  	unsigned int cs;
> +	bool deassert_wp;
>  	const struct nand_op_instr *instrs;
>  	unsigned int ninstrs;
>  };
> @@ -1019,6 +1020,14 @@ struct nand_operation {
>  		.ninstrs = ARRAY_SIZE(_instrs),			\
>  	}
> 
> +#define NAND_DESTRUCTIVE_OPERATION(_cs, _instrs)		\
> +	{							\
> +		.cs = _cs,					\
> +		.deassert_wp = true,				\
> +		.instrs = _instrs,				\
> +		.ninstrs = ARRAY_SIZE(_instrs),			\
> +	}
> +
>  int nand_op_parser_exec_op(struct nand_chip *chip,
>  			   const struct nand_op_parser *parser,
>  			   const struct nand_operation *op, bool check_only);
> --
> 2.37.3
> 
> 


Thanks,
Miquèl