Thanks for helping out Michael, I would never get this right without people like you!
On Wed, Jul 12, 2023 at 9:04 AM Michael Walle michael@walle.cc wrote:
Am 2023-07-12 00:02, schrieb Linus Walleij:
The Winbond W25Q128 (actual vendor name W25Q128JV)
Not necessarily see below. Do you know what part numbers is written on your flash?
Yes, if I look at it with a looking glass it says Winbond 25Q128JVF
has exactly the same flags as the sibling device w25q128fw. The devices both require unlocking and support dual and quad SPI transport.
The actual product naming between devices:
0xef4018: "w25q128" W25Q128JV-IM/JM 0xef7018: "w25q128fw" W25Q128JV-IN/IQ/JQ
Where do you get that string? from winbond.c?
Yes
Because, then it's incorrect. For 0xef7018 its actually w25q128jv.
No I just confused things, it should be w25q128jv not fw. But the actual names to the right are from the datasheet, they are kind of both actually named "jv" :/
But that being said, Winbond is known to reuse the IDs among its flashes. From a quick look at various datasheets:
0x60 seems to be DW, FW and NW(Q) series 0x70 seems to be JV(M) 0x80 seems to be NW(M) 0x40 seems to be BV, JV(Q), "V" (probably the first [1])
(Q) denotes the fixed quad enable bit.
Now 0x40 are the first ones who where added back in the days. I'm not sure, what kind of winbond devices there were and if they support dual/quad read.
Normally, you'd use a .fixups (see w25q256_fixups for example) to dynamically detect the newer flash type and then refine the flags. But because we don't know how the older flashes look like, that would be just guessing :/ Although, I've once thought about fingerprinting the SFDP tables eg. by some hash. But that would assume the SFDP data is not changing a lot on a given device. Not sure if that is the case, we just began to collect SFDP tables of various devices.
If it turns out that only SPI_NOR_HAS_LOCK and SPI_NOR_HAS_TB is needed, I'm leaning towards just adding these flags to the w25q128 entry. According to [1] this was already supported back in the days.
They are absolutely needed, else I cannot write to the flash.
The latter device, "w25q128fw" supports features named DTQ and QPI, otherwise it is the same.
Not having the right flags has the annoying side effect that write access does not work.
This should only apply to FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB).
I'd guess your flash supports SFDP, then the NO_SFDP_FLAGS should be automatically detected. Could you please dump the SFDP tables (described in [2])?
I hope this is correct:
root@OpenWrt:/sys/devices/platform/ubus/10001000.spi/spi_master/spi1/spi1.0/spi-nor# cat jedec_id ef4018
root@OpenWrt:/sys/devices/platform/ubus/10001000.spi/spi_master/spi1/spi1.0/spi-nor# cat manufacturer winbond
root@OpenWrt:/sys/devices/platform/ubus/10001000.spi/spi_master/spi1/spi1.0/spi-nor# cat partname w25q128
root@OpenWrt:/sys/devices/platform/ubus/10001000.spi/spi_master/spi1/spi1.0/spi-nor# hexdump -v -C sfdp 00000000 53 46 44 50 05 01 00 ff 00 05 01 10 80 00 00 ff |SFDP............| 00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000020 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000030 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000040 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000050 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000060 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000070 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| 00000080 e5 20 f9 ff ff ff ff 07 44 eb 08 6b 08 3b 42 bb |. ......D..k.;B.| 00000090 fe ff ff ff ff ff 00 00 ff ff 40 eb 0c 20 0f 52 |..........@.. .R| 000000a0 10 d8 00 00 36 02 a6 00 82 ea 14 c9 e9 63 76 33 |....6........cv3| 000000b0 7a 75 7a 75 f7 a2 d5 5c 19 f7 4d ff e9 30 f8 80 |zuzu.....M..0..| 000000c0
As mentioned above, could you try without the DUAL_READ/QUAD_READ flags.
It works fine but I cannot judge if it is faster or slower, I guess it mostly affects the speed right?
Don't I need to set the PARSE_SFDP macro here, to turn .parse_sfdp = true?
You can have a look at the debugfs whether the detected capabilities are still the same with and without these flags.
This is with no changes:
root@OpenWrt:/sys/kernel/debug/spi-nor/spi1.0# cat capabilities Supported read modes by the flash 1S-1S-1S opcode 0x03 mode cycles 0 dummy cycles 0 1S-1S-1S (fast read) opcode 0x0b mode cycles 0 dummy cycles 8
Supported page program modes by the flash 1S-1S-1S opcode 0x02
This is with PARSE_SFDP:
root@OpenWrt:/sys/kernel/debug/spi-nor/spi1.0# cat capabilities Supported read modes by the flash 1S-1S-1S opcode 0x03 mode cycles 0 dummy cycles 0 1S-1S-1S (fast read) opcode 0x0b mode cycles 0 dummy cycles 8 1S-1S-2S opcode 0x3b mode cycles 0 dummy cycles 8 1S-2S-2S opcode 0xbb mode cycles 2 dummy cycles 2 1S-1S-4S opcode 0x6b mode cycles 0 dummy cycles 8 1S-4S-4S opcode 0xeb mode cycles 2 dummy cycles 4 4S-4S-4S opcode 0xeb mode cycles 2 dummy cycles 0
Supported page program modes by the flash 1S-1S-1S opcode 0x02
So indeed it works with SFDP parsing! I'll send an updated patch.
I guess a lot of the chips could actually use this but someone has to test them on a 1-by-1 basis?
Yours, Linus Walleij