| Message ID | 20241025161501.485684-25-miquel.raynal@bootlin.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | spi-nand/spi-mem DTR support | expand |
On 10/25/24 5:15 PM, Miquel Raynal wrote: > W25N01JW and W25N02JW support many DTR read modes in single, dual and > quad configurations. > > DTR modes however cannot be used at 166MHz, as the bus frequency in > this case must be lowered to 80MHz. ha, what's the benefit then? Aren't we better of with non dtr modes then? 80 MHz * 2 < 166 MHz? > > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> > --- > drivers/mtd/nand/spi/winbond.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c > index 9e2562805d23..77897a52b149 100644 > --- a/drivers/mtd/nand/spi/winbond.c > +++ b/drivers/mtd/nand/spi/winbond.c > @@ -24,10 +24,15 @@ > */ > > static SPINAND_OP_VARIANTS(read_cache_dtr_variants, > + SPINAND_PAGE_READ_FROM_CACHE_QUADIO_DTR_OP(0, 8, NULL, 0, 80 * HZ_PER_MHZ), > + SPINAND_PAGE_READ_FROM_CACHE_X4_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), > SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), > SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), > + SPINAND_PAGE_READ_FROM_CACHE_DUALIO_DTR_OP(0, 4, NULL, 0, 80 * HZ_PER_MHZ), > + SPINAND_PAGE_READ_FROM_CACHE_X2_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), > SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), > SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), > + SPINAND_PAGE_READ_FROM_CACHE_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), > SPINAND_PAGE_READ_FROM_CACHE_FAST_OP(0, 1, NULL, 0), > SPINAND_PAGE_READ_FROM_CACHE_OP(0, 1, NULL, 0, 54 * HZ_PER_MHZ)); >
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c index 9e2562805d23..77897a52b149 100644 --- a/drivers/mtd/nand/spi/winbond.c +++ b/drivers/mtd/nand/spi/winbond.c @@ -24,10 +24,15 @@ */ static SPINAND_OP_VARIANTS(read_cache_dtr_variants, + SPINAND_PAGE_READ_FROM_CACHE_QUADIO_DTR_OP(0, 8, NULL, 0, 80 * HZ_PER_MHZ), + SPINAND_PAGE_READ_FROM_CACHE_X4_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_DUALIO_DTR_OP(0, 4, NULL, 0, 80 * HZ_PER_MHZ), + SPINAND_PAGE_READ_FROM_CACHE_X2_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), + SPINAND_PAGE_READ_FROM_CACHE_DTR_OP(0, 2, NULL, 0, 80 * HZ_PER_MHZ), SPINAND_PAGE_READ_FROM_CACHE_FAST_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_OP(0, 1, NULL, 0, 54 * HZ_PER_MHZ));
W25N01JW and W25N02JW support many DTR read modes in single, dual and quad configurations. DTR modes however cannot be used at 166MHz, as the bus frequency in this case must be lowered to 80MHz. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> --- drivers/mtd/nand/spi/winbond.c | 5 +++++ 1 file changed, 5 insertions(+)