Hi Jagan
>
> On Mon, Jul 4, 2022 at 11:42 AM JaimeLiao <jaimeliao...@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...@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
