linux-kernel - Re: [PATCH v3 3/4] mtd: rawnand: micron: add fixup for ONFI revision

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Date:   Wed, 20 Jun 2018 09:54:10 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     miquel.raynal@...tlin.com, dwmw2@...radead.org,
        computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Marek Vasut <marek.vasut@...il.com>
Subject: Re: [PATCH v3 3/4] mtd: rawnand: micron: add fixup for ONFI
 revision

On Wed, 20 Jun 2018 17:05:43 +1200
Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:

> Some Micron NAND chips (MT29F1G08ABAFAWP-ITE:F) report 00 00 for the
> revision number field of the ONFI parameter page. Rather than rejecting
> these outright assume ONFI version 1.0 if the revision number is 00 00.
> 
> Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> This is now qualified on vendor == MICRON. I haven't qualified this
> based on specific chips the ABAFA (id=d1) and ABBFA (id=a1) variants are
> documented to have this behaviour.
> 
> Changes in v2:
> - use fixup_onfi_param_page
> Changes in v3:
> - add code comment next to workaround
> 
>  drivers/mtd/nand/raw/nand_micron.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
> index 5ec4c90a637d..5cec79372181 100644
> --- a/drivers/mtd/nand/raw/nand_micron.c
> +++ b/drivers/mtd/nand/raw/nand_micron.c
> @@ -289,6 +289,19 @@ static int micron_nand_init(struct nand_chip *chip)
>  	return 0;
>  }
>  
> +static void micron_fixup_onfi_param_page(struct nand_chip *chip,
> +					 struct nand_onfi_params *p)
> +{
> +	/*
> +	 * MT29F1G08ABAFAWP-ITE:F and possibly others report 00 00 for the
> +	 * revision number field of the ONFI parameter page. Assume ONFI
> +	 * version 1.0 if the revision number is 00 00.
> +	 */
> +	if (le16_to_cpu(p->revision) == 0)
> +		p->revision = cpu_to_le16(1 << 1);

Would be better to have macros defining all version numbers in rawnand.h

#define ONFI_VERSION_1_0		BIT(1)
#define ONFI_VERSION_2_0		BIT(2)
#define ONFI_VERSION_2_1		BIT(3)
#define ONFI_VERSION_2_2		BIT(4)
#define ONFI_VERSION_2_3		BIT(5)
#define ONFI_VERSION_3_0		BIT(6)
#define ONFI_VERSION_3_1		BIT(7)
#define ONFI_VERSION_3_2		BIT(8)
#define ONFI_VERSION_4_0		BIT(9)

> +}
> +
>  const struct nand_manufacturer_ops micron_nand_manuf_ops = {
>  	.init = micron_nand_init,
> +	.fixup_onfi_param_page = micron_fixup_onfi_param_page,
>  };