[PATCH 20/30] mtd: spi-nor: winbond: W25Q64JV-M: Add quad page program capability

[Miquel Raynal]

The benefit is massive @25MHz, but the chip does not implement the 4BAIT
table to advertize this capability, so enable it manually:.

Before:
$ flash_speed /dev/mtd0 -dc10
eraseblock write speed is 558 KiB/s
page write speed is 553 KiB/s
2 page write speed is 555 KiB/s

After:
$ flash_speed /dev/mtd0 -dc10
eraseblock write speed is 3047 KiB/s
page write speed is 2909 KiB/s
2 page write speed is 2976 KiB/s

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
$ cat /sys/kernel/debug/spi-nor/spi0.0/params
name		(null)
id		ef 70 17 00 00 00
size		8.00 MiB
write size	1
page size	256
address nbytes	3
flags		HAS_SR_TB | HAS_LOCK | HAS_16BIT_SR | SOFT_RESET | NO_WP

opcodes
 read		0xeb
  dummy cycles	6
 erase		0xd8
 program	0x32
 8D extension	none

protocols
 read		1S-4S-4S
 write		1S-1S-4S
 register	1S-1S-1S

erase commands
 20 (4.00 KiB) [1]
 52 (32.0 KiB) [2]
 d8 (64.0 KiB) [3]
 c7 (8.00 MiB)

sector map
 region (in hex)   | erase mask | overlaid
 ------------------+------------+---------
 00000000-007fffff |     [   3] | no

locked sectors
 region (in hex)   | status   | #sectors
 ------------------+----------+---------
 00000000-007fffff | unlocked | 64
$ cat /sys/kernel/debug/spi-nor/spi0.0/capabilities
Supported read modes by the flash
 1S-1S-1S
  opcode	0x03
  mode cycles	0
  dummy cycles	0
 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
 1S-1S-4S
  opcode	0x32

$ dd if=/dev/urandom of=./spi_test bs=1M count=2
2+0 records in
2+0 records out
$ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ hexdump spi_read
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0200000
$ sha256sum spi_read
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5  spi_read
$ mtd_debug write /dev/mtd0 0 2097152 spi_test
mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from spi_test to address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ sha256sum spi*
d79c3f7b40646d437eff15309c5250e8ee203f805b9d13d8ad8a7019f0dd69f8  spi_read
d79c3f7b40646d437eff15309c5250e8ee203f805b9d13d8ad8a7019f0dd69f8  spi_test
$ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ sha256sum spi*
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5  spi_read
d79c3f7b40646d437eff15309c5250e8ee203f805b9d13d8ad8a7019f0dd69f8  spi_test
---
 drivers/mtd/spi-nor/winbond.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index 7286d50b0c53..3715e269cb7f 100644
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -298,7 +298,7 @@ static const struct flash_info winbond_nor_parts[] = {
 	}, {
 		/* W25Q64JV-M */
 		.id = SNOR_ID(0xef, 0x70, 0x17),
-		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB,
+		.flags = SPI_NOR_QUAD_PP | SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB,
 	}, {
 		/* W25Q128JV-M */
 		.id = SNOR_ID(0xef, 0x70, 0x18),

-- 
2.53.0