[PATCH 1/1] mtd: cfi_cmdset_0002:add fixup for Micron M29EW after erase operation

[Christian Riesch]

Hi,

On Mon, Sep 1, 2014 at 4:20 AM, bpqw <bpqw at micron.com> wrote:
> For Micron M29EW,20ms delay is needed after erase operation.

Is there a datasheet/application note/technical note from Micron
describing this issue? Like the TN-13-07 for the other M29EW fixes?
Are all M29EW types affected?

Thanks,
Christian

>
> Signed-off-by: BeanHuo <bpqw at micron.com>
> ---
>  drivers/mtd/chips/cfi_cmdset_0002.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
> index 5a4bfe3..9b0de91 100644
> --- a/drivers/mtd/chips/cfi_cmdset_0002.c
> +++ b/drivers/mtd/chips/cfi_cmdset_0002.c
> @@ -509,6 +509,16 @@ static void cfi_fixup_m29ew_delay_after_resume(struct cfi_private *cfi)
>                 cfi_udelay(500);
>  }
>
> +static void cfi_fixup_m29ew_delay_after_erase(struct cfi_private *cfi)
> +{
> +       /*
> +        * Resolving the Delay After ERASE Issue @low temperature.
> +        * 20ms delay is needed after erase operation.
> +        */
> +       if (is_m29ew(cfi))
> +               cfi_udelay(20000);
> +}
> +
>  struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)  {
>         struct cfi_private *cfi = map->fldrv_priv; @@ -2397,6 +2407,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
>                 ret = -EIO;
>         }
>
> +       cfi_fixup_m29ew_delay_after_erase(cfi);
>         chip->state = FL_READY;
>         DISABLE_VPP(map);
>         put_chip(map, chip, adr);
> --
> 1.7.9.5
>
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