[PATCH] spi: dw: Fix broken dw_spi_mem_ops()

[Niklas Cassel]

From: Niklas Cassel <niklas.cassel at wdc.com>

The driver is currently using sizeof(op->cmd.opcode) in the op_len
calculation. Commit d15de623013c ("spi: spi-mem: allow specifying a
command's extension") changed op->cmd.opcode from one byte to two.

Instead, a new struct member op->cmd.nbytes is supposed to be used.
For regular commands op->cmd.nbytes will be one.

Commit d15de623013c ("spi: spi-mem: allow specifying a command's
extension") did update some drivers that overload the generic mem_ops()
implementation, but forgot to update dw_spi_mem_ops().

Calculating op_len incorrectly causes dw_spi_mem_ops() to misbehave, since
op_len is used to determine how many bytes that should be read/written.

On the canaan k210 board, this causes the probe of the SPI flash to fail.

Fix the op_len calculation in dw_spi_mem_ops(). Doing so results in
working SPI flash on the canaan k210 board.

Fixes: d15de623013c ("spi: spi-mem: allow specifying a command's extension")
Signed-off-by: Niklas Cassel <niklas.cassel at wdc.com>
---
 drivers/spi/designware_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 742121140d..fc22f540fe 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -572,7 +572,7 @@ static int dw_spi_exec_op(struct spi_slave *slave, const struct spi_mem_op *op)
 	int pos, i, ret = 0;
 	struct udevice *bus = slave->dev->parent;
 	struct dw_spi_priv *priv = dev_get_priv(bus);
-	u8 op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
+	u8 op_len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
 	u8 op_buf[op_len];
 	u32 cr0;
 
-- 
2.34.1