[U-Boot] [PATCH] NAND: Let NAND_NO_SUBPAGE_WRITE through

[Marek Vasut <marek.vasut@gmail.com>]

> There is a problem reported that the NAND_NO_SUBPAGE_WRITE, set by some
> drivers, is silently ignored by NAND core. This causes UBI to malfunction
> on these drivers, because UBI tries to use subpage writes.
> 
> This was discussed already with no conclusion, see thread:
> Message-Id: <1302372335-30232-6-git-send-email-sbabic@denx.de>
> 
> The bug was recently retriggered by Veli-Pekka Peltola, causing him trouble
> with UBI on the MX28 CPU:
> Message-ID: <4EB3E4EA.9080509@bluegiga.com>
> 
> Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Scott Wood <scottwood@freescale.com>
> Cc: Veli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
> ---
>  drivers/mtd/nand/nand_base.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 6aac6a2..7ecd5a3 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -2548,6 +2548,7 @@ static const struct nand_flash_dev
> *nand_get_flash_type(struct mtd_info *mtd, {
>  	int ret, maf_idx;
>  	int tmp_id, tmp_manf;
> +	int no_subpage = 0;
> 
>  	/* Select the device */
>  	chip->select_chip(mtd, 0);
> @@ -2612,10 +2613,20 @@ static const struct nand_flash_dev
> *nand_get_flash_type(struct mtd_info *mtd, if (!ret)
>  		nand_flash_detect_non_onfi(mtd, chip, type, &busw);
> 
> +	/*
> +	 * If the controller is incapable of subpage writes, force no subpage
> +	 * writes. This has to be done here, otherwise UBI will complain.
> +	 */
> +	if (chip->options & NAND_NO_SUBPAGE_WRITE)
> +		no_subpage = 1;
> +
>  	/* Get chip options, preserve non chip based options */
>  	chip->options &= ~NAND_CHIPOPTIONS_MSK;
>  	chip->options |= type->options & NAND_CHIPOPTIONS_MSK;
> 
> +	if (no_subpage)
> +		chip->options |= NAND_NO_SUBPAGE_WRITE;
> +
>  	/*
>  	 * Set chip as a default. Board drivers can override it, if necessary
>  	 */

Scott, ping ?