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

[Greg KH <gregkh@linuxfoundation.org>]

On Sun, Jul 01, 2018 at 06:36:33PM +0200, Martin Kaiser wrote:
> commit 3f77f244d8ec28e3a0a81240ffac7d626390060c upstream.
> 
> 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.
> 
> Fixes: d484018 ("mtd: mxc_nand: set NFC registers after reset")
> Cc: stable@vger.kernel.org
> Signed-off-by: Martin Kaiser <martin@kaiser.cx>
> Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
> ---
> Hello Greg,
> 
> the file that this patch modifies was renamed after 4.14. This patch
> uses the previous name. I tested it to apply to the 4.4, 4.9 and 4.14
> stable branches. Could you add it to the queues again?

Now applied, thanks.

greg k-h