Even when spi_nor_write_reg() has no data to write, like when executing a write enable operation, it sets the data direction to SPI_MEM_DATA_OUT. This trips up spi_mem_check_buswidth() because it expects a data phase when there is none. Make sure the data direction is set to SPI_MEM_NO_DATA when there is no data to write.
Signed-off-by: Pratyush Yadav p.yadav@ti.com --- drivers/mtd/spi/spi-nor-core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index b2a25b0099..1816319ad0 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -209,6 +209,9 @@ static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) SPI_MEM_OP_NO_DUMMY, SPI_MEM_OP_DATA_OUT(len, NULL, 1));
+ if (len == 0) + op.data.dir = SPI_MEM_NO_DATA; + return spi_nor_read_write_reg(nor, &op, buf); }