[PATCH v8 2/4] mtd: spi-nor-core: Adding different type of command extension in Soft Reset

[liao jaime]

Hi Jagan

>
> On Mon, Jul 4, 2022 at 11:42 AM JaimeLiao <jaimeliao.tw at gmail.com> wrote:
> >
> > Power-on-Reset is a method to restore flash back to 1S-1S-1S mode from 8D-8D-8D
> > in the begging of probe.
> >
> > Command extension type is not standardized across flash vendors in DTR mode.
> >
> > For suiting different vendor flash devices, adding a flag to seperate types for
> > soft reset on boot.
> >
> > Signed-off-by: JaimeLiao <jaimeliao.tw at gmail.com>
> > ---
> >  drivers/mtd/spi/Kconfig        | 7 +++++++
> >  drivers/mtd/spi/spi-nor-core.c | 7 ++++++-
> >  2 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
> > index f350c7e5dc..5bb1baa019 100644
> > --- a/drivers/mtd/spi/Kconfig
> > +++ b/drivers/mtd/spi/Kconfig
> > @@ -97,6 +97,13 @@ config SPI_FLASH_SMART_HWCAPS
> >          can support a type of operation in a much more refined way compared
> >          to using flags like SPI_RX_DUAL, SPI_TX_QUAD, etc.
> >
> > +config SPI_NOR_BOOT_SOFT_RESET_EXT_INVERT
> > +       bool "Command extension type is INVERT for Software Reset on boot"
> > +       default n
> > +       help
> > +        Because of SFDP information can not be get before boot.
> > +        So define command extension type is INVERT when Software Reset on boot only.
> > +
> >  config SPI_FLASH_SOFT_RESET
> >         bool "Software Reset support for SPI NOR flashes"
> >         help
> > diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
> > index 5d319e4c0f..50460feaf8 100644
> > --- a/drivers/mtd/spi/spi-nor-core.c
> > +++ b/drivers/mtd/spi/spi-nor-core.c
> > @@ -3697,7 +3697,12 @@ static int spi_nor_soft_reset(struct spi_nor *nor)
> >         enum spi_nor_cmd_ext ext;
> >
> >         ext = nor->cmd_ext_type;
> > -       nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
> > +       if (nor->cmd_ext_type == SPI_NOR_EXT_NONE) {
> > +               nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
> > +#if CONFIG_IS_ENABLED(SPI_NOR_BOOT_SOFT_RESET_EXT_INVERT)
> > +               nor->cmd_ext_type = SPI_NOR_EXT_INVERT;
>
> Better check those parts whose extension is not standard instead of CONFIG.
spi_nor_soft_reset will be execute before read ID and read SFDP so
that I think we are hard
to get information from flash device.
>
> Jagan.

Thanks
Jaime