From: T Karthik Reddy <t.karthik.re...@xilinx.com>
In current implementation dummy buswidth is set equal to address
buswidth. In case of quad spi (mode 1-1-4), where address width is 1
the dummy bytes will be calculated to 1(8 dummy cycles) and dummy
buswidth is set to 1. Due to this, the controller driver will introduce
8 dummy cycles on data line(D0) during read operation.
But since we are using 4 data lines in case of qspi, we need to change
this dummy bus width to 4. This will make dummy bytes to 4 inplace of 1.
This will be taken care in controller driver by dividing with dummy
buswidth again as in below code, which makes dummy cycles to 8 as
earlier.
dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
So with this change dummy cycles will be on all data lines(D0-D3) and it
is taken care for all the configurations(single, dual, quad and octal).
Signed-off-by: Ashok Reddy Soma <ashok.reddy.s...@xilinx.com>
Signed-off-by: T Karthik Reddy <t.karthik.re...@xilinx.com>
Signed-off-by: Tejas Bhumkar <tejas.arvind.bhum...@amd.com>
---
drivers/mtd/spi/spi-nor-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 473d9f41f3..8949dab548 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -260,7 +260,7 @@ void spi_nor_setup_op(const struct spi_nor *nor,
op->addr.buswidth = spi_nor_get_protocol_addr_nbits(proto);
if (op->dummy.nbytes)
- op->dummy.buswidth = spi_nor_get_protocol_addr_nbits(proto);
+ op->dummy.buswidth = spi_nor_get_protocol_data_nbits(proto);
if (op->data.nbytes)
op->data.buswidth = spi_nor_get_protocol_data_nbits(proto);
--
2.27.0
