mtd: spi-nor: core: use dummy cycle and address width info from SFDP

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>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20201005153138.6437-7-p.yadav@ti.com

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index fea61980282518c5c7a2cb29c79c43b588ed2506..d63dfd7d4b31fd52e5be0de960f2fec2d4716edd 100644 (file)
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -385,6 +385,11 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
                                   SPI_MEM_OP_NO_DUMMY,
                                   SPI_MEM_OP_DATA_IN(1, sr, 0));
 
+               if (nor->reg_proto == SNOR_PROTO_8_8_8_DTR) {
+                       op.addr.nbytes = nor->params->rdsr_addr_nbytes;
+                       op.dummy.nbytes = nor->params->rdsr_dummy;
+               }
+
                spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
 
                ret = spi_mem_exec_op(nor->spimem, &op);
@@ -418,6 +423,11 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
                                   SPI_MEM_OP_NO_DUMMY,
                                   SPI_MEM_OP_DATA_IN(1, fsr, 0));
 
+               if (nor->reg_proto == SNOR_PROTO_8_8_8_DTR) {
+                       op.addr.nbytes = nor->params->rdsr_addr_nbytes;
+                       op.dummy.nbytes = nor->params->rdsr_dummy;
+               }
+
                spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
 
                ret = spi_mem_exec_op(nor->spimem, &op);