linux-kernel - Re: [PATCH 2/3] mtd: nand: add NAND_NEED_SCRAMBLING flag to the H27UCG8T2ATR-BC definition

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Message-ID: <CAFLxGvx_3ZWMqimh36t1uCSAqbHnD5ZU=vQBMsDHzs6qPxUExQ@mail.gmail.com>
Date:	Tue, 20 Oct 2015 09:20:10 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-sunxi@...glegroups.com, Hans de Goede <hdegoede@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mtd: nand: add NAND_NEED_SCRAMBLING flag to the
 H27UCG8T2ATR-BC definition

On Thu, Oct 15, 2015 at 7:17 PM, Boris Brezillon
<boris.brezillon@...e-electrons.com> wrote:
> The H27UCG8T2ATR-BC requires an external data scrambler. Reflect this
> constraint in the nand_flash_ids definition.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  drivers/mtd/nand/nand_ids.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
> index a8804a3..ccc05f5 100644
> --- a/drivers/mtd/nand/nand_ids.c
> +++ b/drivers/mtd/nand/nand_ids.c
> @@ -50,8 +50,8 @@ struct nand_flash_dev nand_flash_ids[] = {
>                   SZ_16K, SZ_8K, SZ_4M, 0, 6, 1280, NAND_ECC_INFO(40, SZ_1K) },
>         {"H27UCG8T2ATR-BC 64G 3.3V 8-bit",
>                 { .id = {0xad, 0xde, 0x94, 0xda, 0x74, 0xc4} },
> -                 SZ_8K, SZ_8K, SZ_2M, 0, 6, 640, NAND_ECC_INFO(40, SZ_1K),
> -                 4 },
> +                 SZ_8K, SZ_8K, SZ_2M, NAND_NEED_SCRAMBLING, 6, 640,
> +                 NAND_ECC_INFO(40, SZ_1K), 4 },

Would it make sense to print a warning if a NAND which needs scrambling
is used on a NFC which does not support this feature?

-- 
Thanks,
//richard
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