[PATCH 13/15] mtd: spi-nor-core: Use Read SR dummy cycle and address width from SFDP

[Pratyush Yadav]

The xSPI Profile 1.0 table specifies how many dummy cycles and address
bytes are needed for the Read Status Register command in octal DTR mode.
Use that information to send the correct Read SR command.

Signed-off-by: Pratyush Yadav <p.yadav at ti.com>
---
 drivers/mtd/spi/spi-nor-core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 0d3ab44a41..6802fb625b 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -340,8 +340,16 @@ static int read_sr(struct spi_nor *nor)
 {
 	int ret;
 	u8 val;
+	u8 addr_nbytes = nor->rdsr_addr_nbytes;
+	u8 dummy = nor->rdsr_dummy;
+	struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDSR, 1),
+					  SPI_MEM_OP_ADDR(addr_nbytes, 0, 1),
+					  SPI_MEM_OP_DUMMY(dummy, 1),
+					  SPI_MEM_OP_DATA_IN(1, NULL, 1));
 
-	ret = nor->read_reg(nor, SPINOR_OP_RDSR, &val, 1);
+	spi_nor_setup_op(nor, &op, nor->reg_proto);
+
+	ret = spi_nor_read_write_reg(nor, &op, &val);
 	if (ret < 0) {
 		pr_debug("error %d reading SR\n", (int)ret);
 		return ret;
-- 
2.25.0