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Date: Tue, 20 Sep 2022 19:51:43 +0100 From: Sudip Mukherjee <sudip.mukherjee@...ive.com> To: Tudor Ambarus <tudor.ambarus@...rochip.com>, Pratyush Yadav <pratyush@...nel.org>, Michael Walle <michael@...le.cc>, Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com> Cc: greentime.hu@...ive.com, jude.onyenegecha@...ive.com, william.salmon@...ive.com, adnan.chowdhury@...ive.com, ben.dooks@...ive.com, linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 1/2] mtd: spi-nor: issi: is25wp256: Init flash based on SFDP On Tue, Sep 20, 2022 at 7:48 PM Sudip Mukherjee <sudip.mukherjee@...ive.com> wrote: > > The datasheet of is25wp256 says it supports SFDP. Get rid of the static > initialization of the flash parameters and init them when parsing SFDP. > > Testing showed the flash using SPINOR_OP_READ_1_1_4_4B 0x6c, > SPINOR_OP_PP_4B 0x12 and SPINOR_OP_BE_4K_4B 0x21 before enabling SFDP. > After this patch, it parses the SFDP information and still uses the > same opcodes. > > Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ive.com> > --- > > No change from v2, just resending again with the next patch. > 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 57f8d4fee65622104e24276e865f662844f12242 qspi_test 57f8d4fee65622104e24276e865f662844f12242 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
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