[PATCH v3 2/2] mtd: spi-nor: add SFDP fixups for Quad Page Program

[Sudip Mukherjee]

On Tue, Sep 20, 2022 at 7:48 PM Sudip Mukherjee
<sudip.mukherjee at sifive.com> wrote:
>
> SFDP table of some flash chips do not advertise support of Quad Input
> Page Program even though it has support. Use flags and add hardware
> cap for these chips.
>
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee at sifive.com>
> ---
>
> Change from v2: SPI_NOR_QUAD_PP added to info->flags instead of
> info->fixup_flags.
> Link: https://lore.kernel.org/lkml/498c33a8-014f-e542-f143-cba5760fafdd@microchip.com/
>
> Results from the tests given by Tudor in the following mail.

Test result after this patch:

# dd if=/dev/urandom of=./qspi_test bs=1M count=6
6+0 records in
6+0 records out

# mtd_debug write /dev/mtd4 0 6291456 qspi_test
Copied 6291456 bytes from qspi_test to address 0x00000000 in flash

# mtd_debug erase /dev/mtd4 0 6291456
Erased 6291456 bytes from address 0x00000000 in flash

# mtd_debug read /dev/mtd4 0 6291456 qspi_read
Copied 6291456 bytes from address 0x00000000 in flash to qspi_read

# hexdump qspi_read
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0600000

# mtd_debug write /dev/mtd4 0 6291456 qspi_test
Copied 6291456 bytes from qspi_test to address 0x00000000 in flash

# mtd_debug read /dev/mtd4 0 6291456 qspi_read
Copied 6291456 bytes from address 0x00000000 in flash to qspi_read

# sha1sum qspi_test qspi_read
fefab5ffbc2ca7bed3b45732f2fe6a8139cd6248  qspi_test
fefab5ffbc2ca7bed3b45732f2fe6a8139cd6248  qspi_read

# cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
is25wp256

# cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
9d7019

# cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
issi

# xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
53464450060101ff00060110300000ff9d05010380000002ffffffffffff
ffffffffffffffffffffffffffffffffffffe520f9ffffffff0f44eb086b
083b80bbfeffffffffff00ffffff44eb0c200f5210d800ff234ac90082d8
11cecccd68467a757a75f7aed55c4a422cfff030faa9ffffffffffffffff
ffffffffffffffff501950169ff9c0648fefffff

# md5sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
ba14818b9ec42713f24d94d66bb90ba0  /sys/bus/spi/devices/spi0.0/spi-nor/sfdp


-- 
Regards
Sudip