[13/15] mtd: spi-nor-core: Use Read SR dummy cycle and address width from SFDP
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Message ID 20200226125606.22684-14-p.yadav@ti.com
State Superseded
Delegated to: Jagannadha Sutradharudu Teki
Headers show
Series
  • mtd: spi-nor-core: add xSPI Octal DTR support
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Commit Message

Pratyush Yadav Feb. 26, 2020, 12:56 p.m. UTC
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@ti.com>
---
 drivers/mtd/spi/spi-nor-core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch
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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;