From: Dhruva Gole d-gole@ti.com
in spi_mem_dtr_supports_op we have a check for allowing only even number of bytes to be r/w. Odd bytes writing can be a concern while writing data to a flash for example because 8 DTR mode doesn't support it. However, reading ODD Bytes even though may not be physically possible we can still allow for it because it will not have serious implications on any critical registers being overwritten since they are just reads.
Cc: Vaishnav Achath vaishnav.a@ti.com Cc: Pratyush Yadav pratyush@kernel.org Cc: Vignesh Raghavendra vigneshr@ti.com Tested-by: Nikhil M Jain n-jain1@ti.com Signed-off-by: Dhruva Gole d-gole@ti.com --- drivers/spi/spi-mem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index 57a36f31a5..b7eca58359 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -185,7 +185,7 @@ bool spi_mem_dtr_supports_op(struct spi_slave *slave, * Transactions of odd length do not make sense for 8D-8D-8D mode * because a byte is transferred in just half a cycle. */ - if (op->data.dir != SPI_MEM_NO_DATA && + if (op->data.dir != SPI_MEM_NO_DATA && op->data.dir != SPI_MEM_DATA_IN && op->data.buswidth == 8 && op->data.nbytes % 2) return false;