[PATCH 06/13] mtd: spinand: winbond: Add 1S_1S_1S continuous read variant

[Miquel Raynal]

The speed jump is not amazing, yet the feature exists and brings a few %
of extra speed.

$ flash_speed /dev/mtd0 -C
...
page read speed is 966 KiB/s
testing multiple pages read speed
2 page read speed is 977 KiB/s
3 page read speed is 984 KiB/s
4 page read speed is 984 KiB/s
5 page read speed is 987 KiB/s
6 page read speed is 991 KiB/s
7 page read speed is 992 KiB/s
8 page read speed is 988 KiB/s
9 page read speed is 992 KiB/s
10 page read speed is 991 KiB/s
11 page read speed is 995 KiB/s
12 page read speed is 991 KiB/s
13 page read speed is 995 KiB/s
14 page read speed is 995 KiB/s
15 page read speed is 995 KiB/s
16 page read speed is 996 KiB/s
32 page read speed is 992 KiB/s
64 page read speed is 996 KiB/s
...

Data integrity can be checked with the new mtd-utils tool:

$ nandcontreadtest /dev/mtd0
testing 2 blocks from 0 to 1 (2 good), seed 37
success: verified 524288 bytes read in 517.787 ms (988.82 KiB/s)

Link: https://lore.kernel.org/linux-mtd/20261030144108.2211604-1-miquel.raynal@xxxxxxxxxxx
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/spi/winbond.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 8bf2d4e08bec..72f041b87bda 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -39,6 +39,13 @@
  * always at least provide the column. Keep using address cycles, but
  * reduce the number of dummy cycles accordingly.
  */
+#define WINBOND_CONT_READ_FROM_CACHE_1S_1S_1S_OP(ndummy, buf, len, freq) \
+	SPI_MEM_OP(SPI_MEM_OP_CMD(0x03, 1),				\
+		   SPI_MEM_OP_ADDR(1, 0, 1),				\
+		   SPI_MEM_OP_DUMMY(ndummy - 1, 1),			\
+		   SPI_MEM_OP_DATA_IN(len, buf, 1),			\
+		   SPI_MEM_OP_MAX_FREQ(freq))
+
 #define WINBOND_CONT_READ_FROM_CACHE_FAST_1S_1S_1S_OP(ndummy, buf, len, freq) \
 	SPI_MEM_OP(SPI_MEM_OP_CMD(0x0b, 1),				\
 		   SPI_MEM_OP_ADDR(1, 0, 1),				\
@@ -216,7 +223,8 @@ static SPINAND_OP_VARIANTS(cont_read_cache_variants,
 		WINBOND_CONT_READ_FROM_CACHE_1S_1S_4S_OP(4, NULL, 0, 0),
 		WINBOND_CONT_READ_FROM_CACHE_1S_2S_2S_OP(4, NULL, 0, 0),
 		WINBOND_CONT_READ_FROM_CACHE_1S_1S_2S_OP(4, NULL, 0, 0),
-		WINBOND_CONT_READ_FROM_CACHE_FAST_1S_1S_1S_OP(4, NULL, 0, 0));
+		WINBOND_CONT_READ_FROM_CACHE_FAST_1S_1S_1S_OP(4, NULL, 0, 0),
+		WINBOND_CONT_READ_FROM_CACHE_1S_1S_1S_OP(3, NULL, 0, 0));
 
 static SPINAND_OP_VARIANTS(write_cache_variants,
 		SPINAND_PROG_LOAD_1S_1S_4S_OP(true, 0, NULL, 0),

-- 
2.56.0