diff mbox series

[v3,10/14] mtd: spi-nor: core: use dummy cycle and address width info from SFDP

Message ID 1590652696-8844-11-git-send-email-masonccyang@mxic.com.tw
State New
Headers show
Series [v3,01/14] spi: spi-mem: allow specifying whether an op is DTR or not | expand

Commit Message

Mason Yang May 28, 2020, 7:58 a.m. UTC 
From: Pratyush Yadav <p.yadav@ti.com>

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-nor/core.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 117d117..cbfdf544 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -435,6 +435,8 @@  int spi_nor_write_cr2(struct spi_nor *nor, u32 addr, u8 *cr2)
 static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 {
 	int ret;
+	u8 addr_bytes = nor->params->rdsr_addr_nbytes;
+	u8 dummy = nor->params->rdsr_dummy;
 
 	if (nor->spimem) {
 		struct spi_mem_op op =
@@ -443,10 +445,19 @@  static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
+		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
+			op.addr.nbytes = addr_bytes;
+			op.addr.val = 0;
+			op.dummy.nbytes = dummy;
+		}
+
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
-						    sr, 1);
+		if (spi_nor_protocol_is_dtr(nor->reg_proto))
+			ret = -ENOTSUPP;
+		else
+			ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
+							    sr, 1);
 	}
 
 	if (ret)
@@ -466,6 +477,8 @@  static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 {
 	int ret;
+	u8 addr_bytes = nor->params->rdsr_addr_nbytes;
+	u8 dummy = nor->params->rdsr_dummy;
 
 	if (nor->spimem) {
 		struct spi_mem_op op =
@@ -474,6 +487,12 @@  static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, fsr, 1));
 
+		if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
+			op.addr.nbytes = addr_bytes;
+			op.addr.val = 0;
+			op.dummy.nbytes = dummy;
+		}
+
 		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);