Re: [PATCH] mtd: rawnand: mxc: set spare area size register explicitly

[Sascha Hauer]

On Sun, Jun 03, 2018 at 01:31:35PM +0200, Martin Kaiser wrote:
> The v21 version of the NAND flash controller contains a Spare Area Size
> Register (SPAS) at offset 0x10. Its setting defaults to the maximum
> spare area size of 218 bytes. The size that is set in this register is
> used by the controller when it calculates the ECC bytes internally in
> hardware.
> 
> Usually, this register is updated from settings in the IIM fuses when
> the system is booting from nand flash. For other boot media, however,
> the SPAS register remains at the default setting, which may not work for
> the particular flash chip on the board. The same goes for flash chips
> whose configuration cannot be set in the IIM fuses (e.g. chips with 2k
> sector size and 128 bytes spare area size can't be configured in the IIM
> fuses on imx25 systems).
> 
> Set the SPAS register explicitly during the preset operation. Derive the
> register value from mtd->oobsize that was detected during probe by
> decoding the flash chip's ID bytes.
> 
> While at it, rename the define for the spare area register's offset to
> NFC_V21_RSLTSPARE_AREA. The register at offset 0x10 on v1 controllers is
> different from the register on v21 controllers.
> 
> Signed-off-by: Martin Kaiser <martin@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Reviewed-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>

Sascha

> ---
>  drivers/mtd/nand/raw/mxc_nand.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/mxc_nand.c b/drivers/mtd/nand/raw/mxc_nand.c
> index 45786e7..c2f8572 100644
> --- a/drivers/mtd/nand/raw/mxc_nand.c
> +++ b/drivers/mtd/nand/raw/mxc_nand.c
> @@ -48,7 +48,7 @@
>  #define NFC_V1_V2_CONFIG		(host->regs + 0x0a)
>  #define NFC_V1_V2_ECC_STATUS_RESULT	(host->regs + 0x0c)
>  #define NFC_V1_V2_RSLTMAIN_AREA		(host->regs + 0x0e)
> -#define NFC_V1_V2_RSLTSPARE_AREA	(host->regs + 0x10)
> +#define NFC_V21_RSLTSPARE_AREA		(host->regs + 0x10)
>  #define NFC_V1_V2_WRPROT		(host->regs + 0x12)
>  #define NFC_V1_UNLOCKSTART_BLKADDR	(host->regs + 0x14)
>  #define NFC_V1_UNLOCKEND_BLKADDR	(host->regs + 0x16)
> @@ -1274,6 +1274,9 @@ static void preset_v2(struct mtd_info *mtd)
>  	writew(config1, NFC_V1_V2_CONFIG1);
>  	/* preset operation */
>  
> +	/* spare area size in 16bit words */
> +	writew(mtd->oobsize >> 1, NFC_V21_RSLTSPARE_AREA);
> +
>  	/* Unlock the internal RAM Buffer */
>  	writew(0x2, NFC_V1_V2_CONFIG);
>  
> -- 
> 2.1.4
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |