linux-kernel - Re: [PATCH] mtd: nand: Fix nand_command

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Date:   Fri, 16 Sep 2016 15:16:20 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        linux-mtd@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand: Fix nand_command_lp() for 8bits opcodes

On Wed, 15 Jun 2016 13:09:51 +0200
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> 8 bits opcodes should be followed by a single address cycle. Make the
> 2nd address cycle dependent of !nand_opcode_8bits(command).

Applied.

> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  drivers/mtd/nand/nand_base.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 0b0dc29..c2f83236 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -745,7 +745,10 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
>  				column >>= 1;
>  			chip->cmd_ctrl(mtd, column, ctrl);
>  			ctrl &= ~NAND_CTRL_CHANGE;
> -			chip->cmd_ctrl(mtd, column >> 8, ctrl);
> +
> +			/* Only ouput a single addr cycle for 8bits opcodes. */
> +			if (!nand_opcode_8bits(command))
> +				chip->cmd_ctrl(mtd, column >> 8, ctrl);
>  		}
>  		if (page_addr != -1) {
>  			chip->cmd_ctrl(mtd, page_addr, ctrl);