linux-kernel - Re: [PATCH v2 1/3] mtd: spi-nor: issi: is25wp256: Init flash based on SFDP

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Message-ID: <2a50d782-ff21-91af-8488-503168e29867@microchip.com>
Date:   Wed, 10 Aug 2022 07:55:39 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <sudip.mukherjee@...ive.com>, <pratyush@...nel.org>,
        <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <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 v2 1/3] mtd: spi-nor: issi: is25wp256: Init flash based on
 SFDP

On 8/9/22 23:14, Sudip Mukherjee wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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>
> ---
>  drivers/mtd/spi-nor/issi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/issi.c b/drivers/mtd/spi-nor/issi.c
> index 89a66a19d754..8b48459b5054 100644
> --- a/drivers/mtd/spi-nor/issi.c
> +++ b/drivers/mtd/spi-nor/issi.c
> @@ -71,7 +71,7 @@ static const struct flash_info issi_nor_parts[] = {
>         { "is25wp128",  INFO(0x9d7018, 0, 64 * 1024, 256)
>                 NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "is25wp256", INFO(0x9d7019, 0, 64 * 1024, 512)
> -               NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
> +               PARSE_SFDP
>                 FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
>                 .fixups = &is25lp256_fixups },
> 
> --
> 2.30.2
> 

Looks good to me.
When submitting flash updates or new flash additions, we require contributors
to do a little test using mtd-utils and to dump the SPI NOR sysfs entries.
Would you please do that?

Here's the simple test:

Run the test_qspi.sh script: 
#!/bin/sh 

dd if=/dev/urandom of=./qspi_test bs=1M count=6 
mtd_debug write /dev/mtd5 0 6291456 qspi_test 
mtd_debug erase /dev/mtd5 0 6291456 
mtd_debug read /dev/mtd5 0 6291456 qspi_read 
hexdump qspi_read 
mtd_debug write /dev/mtd5 0 6291456 qspi_test 
mtd_debug read /dev/mtd5 0 6291456 qspi_read 
sha1sum qspi_test qspi_read 

The two SHA-1 sums must be the same to pass this test. 

Here's an example on how to dumps the sysfs entries:
zynq> cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
s25hl02gt
zynq> cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
342a1c0f0090
zynq> cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
spansion
zynq> xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp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zynq> md5sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
86aef254bcfdf763bdb92e4c31667242  /sys/bus/spi/devices/spi0.0/spi-nor/sfdp

Thanks!


-- 
Cheers,
ta