linux-kernel - Re: [PATCH v2] mtd: micron-st: enable lock/unlock for mt25qu512a

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Message-ID: <a8271289-0611-4e37-cf37-0be19a85656b@leica-geosystems.com>
Date:   Fri, 14 Jul 2023 08:15:24 +0000
From:   SHUKLA Mamta Ramendra <mamta.shukla@...ca-geosystems.com>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>,
        "pratyush@...nel.org" <pratyush@...nel.org>,
        "michael@...le.cc" <michael@...le.cc>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     GEO-CHHER-bsp-development 
        <bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH v2] mtd: micron-st: enable lock/unlock for mt25qu512a

Hello Tudor,

On 13.07.23 05:43, Tudor Ambarus wrote:
> This email is not from Hexagon’s Office 365 instance. Please be careful while clicking links, opening attachments, or replying to this email.
> 
> 
> On 05.07.2023 18:49, Mamta Shukla wrote:
>> mt25qu512a[1] supports locking/unlocking through BP bits in SR.
>>
>> Tested using mtd-utils- flash_lock/flash_unlock for MT25QU512ABB8E12.
>>
>> Link: https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_u_512_abb_0.pdf?rev=b259aadc3bea49ea8210a41c9ad58211
>> Signed-off-by: Mamta Shukla <mamta.shukla@...ca-geosystems.com>
>> ---
>>   Changes in v2:
>>   - add Link tag
>>   - fix chip part number mt25ql512a->mt25qu512a
>>
>>   drivers/mtd/spi-nor/micron-st.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
>> index 4b919756a205..08e94340ebaa 100644
>> --- a/drivers/mtd/spi-nor/micron-st.c
>> +++ b/drivers/mtd/spi-nor/micron-st.c
>> @@ -229,6 +229,8 @@ static const struct flash_info st_nor_parts[] = {
>>                MFR_FLAGS(USE_FSR)
>>        },
>>        { "mt25qu512a",  INFO6(0x20bb20, 0x104400, 64 * 1024, 1024)
>> +             FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
>> +                   SPI_NOR_BP3_SR_BIT6)
>>                NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
>>                FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
>>                MFR_FLAGS(USE_FSR)
> 
> Can you try the following instead? We try to use SFDP parsing whenever
> possible.
>          { "mt25qu512a",  INFO6(0x20bb20, 0x104400, 0, 0)
>                  FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
>                  SPI_NOR_BP3_SR_BIT6)
>                  PARSE_SFDP
>                  MFR_FLAGS(USE_FSR)


I tested with SFDP Parsing Flag. It works fine.

---------------------------------------------------------------------------------
[  214.726090] ACPI: Host-directed Dynamic ACPI Table Load:
[  214.731482] ACPI: SSDT 0xFFFF892882D89800 0000EC (v02 ALASKA MT25QU 
00001000 INTL 20190509)
[  214.766082] spi-nor spi-PRP0001:00: mt25qu512a (65536 Kbytes)


cat /sys/bus/spi/devices/spi-PRP0001:00/spi-nor/jedec_id
20bb20104400

cat /sys/bus/spi/devices/spi-PRP0001:00/spi-nor/manufacturer
st

cat /sys/bus/spi/devices/spi-PRP0001:00/spi-nor/partname
mt25qu512a

xxd -p  /sys/bus/spi/devices/spi-PRP0001:00/spi-nor/sfdp
53464450060101ff00060110300000ff84000102800000ffffffffffffff
ffffffffffffffffffffffffffffffffffffe520fbffffffff1f29eb276b
273b27bbffffffffffff27bbffff29eb0c2010d80f520000244a99008b8e
03e1ac0127387a757a75fbbdd55c4a0f82ff81bd3d36ffffffffffffffff
ffffffffffffffffffe7ffff21dcffff

md5sum  /sys/bus/spi/devices/spi-PRP0001:00/spi-nor/sfdp
610efba1647e00ac6db18beb11e84c04 
/sys/bus/spi/devices/spi-PRP0001:00/spi-nor/sfdp

dd if=/dev/urandom of=/tmp/qspi_write  bs=1M count=1
1+0 records in
1+0 records out
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0221391 s, 47.4 MB/s

mtd_debug write /dev/mtd0 0 1048576 /tmp/qspi_write
Copied 1048576 bytes from /tmp/qspi_write to address 0x00000000 in flash

mtd_debug erase /dev/mtd0 0 1048576
Erased 1048576 bytes from address 0x00000000 in flash

mtd_debug read /dev/mtd0 0 1048576 /tmp/qspi_read
Copied 1048576 bytes from address 0x00000000 in flash to /tmp/qspi_read

hexdump /tmp/qspi_read
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0100000

mtd_debug write /dev/mtd0 0 1048576 /tmp/qspi_write
Copied 1048576 bytes from /tmp/qspi_write to address 0x00000000 in flash

mtd_debug read /dev/mtd0 0 1048576 /tmp/qspi_read
Copied 1048576 bytes from address 0x00000000 in flash to /tmp/qspi_read

sha1sum /tmp/qspi_write  /tmp/qspi_read
4fe4e71b11f44e9672bd49e2e32c0fd94da4feb6  /tmp/qspi_write
4fe4e71b11f44e9672bd49e2e32c0fd94da4feb6  /tmp/qspi_read

----------------------------------------------------------------------------------

Shall I write a new commit for PARSE_SFDP Flag or update this commit as-
"Modify mt25qu512a Flags" ?

> 
> You then have to dump the SFDP tables and do a sanity check to make sure
> everything's fine after your changes. You can an example on how to do
> that on the commit message from
> https://lore.kernel.org/linux-mtd/8b7d2420-26b6-405b-8ef7-75e0a0201402@linaro.org/T/#m3550973e0884ec4a288d344fabd4a9c3b64af46e

Thanks,
Mamta