Revert "spi: zynq_qspi: Use dummy buswidth in dummy byte calculation"

This reverts commit e097847. The
commit wrongly divides the dummy bytes by dummy bus width to calculate
the dummy bytes. The framework already converts the dummy cycles to the
number of bytes and the controller use the SPI flash command to
determine the dummy cycles via the address width.

Signed-off-by: Stefan Herbrechtsmeier <[email protected]>
Acked-by: Ashok Reddy Soma <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

drivers/spi/zynq_qspi.c

@@ -676,7 +676,6 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
 			     const struct spi_mem_op *op)
 {
 	int op_len, pos = 0, ret, i;
-	u32 dummy_bytes = 0;
 	unsigned int flag = 0;
 	const u8 *tx_buf = NULL;
 	u8 *rx_buf = NULL;
@@ -689,11 +688,6 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
 	}
 
 	op_len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
-	if (op->dummy.nbytes) {
-		op_len = op->cmd.nbytes + op->addr.nbytes +
-			 op->dummy.nbytes / op->dummy.buswidth;
-		dummy_bytes = op->dummy.nbytes / op->dummy.buswidth;
-	}
 
 	u8 op_buf[op_len];
 
@@ -707,8 +701,8 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
 		pos += op->addr.nbytes;
 	}
 
-	if (dummy_bytes)
-		memset(op_buf + pos, 0xff, dummy_bytes);
+	if (op->dummy.nbytes)
+		memset(op_buf + pos, 0xff, op->dummy.nbytes);
 
 	/* 1st transfer: opcode + address + dummy cycles */
 	/* Make sure to set END bit if no tx or rx data messages follow */