spi: aspeed: Enable Quad SPI mode for page program

Ensure the controller switches to quad I/O mode when
spi-tx-bus-width dts property is 4 and the Quad SPI program
opcode (32h or 34h) is used. Without this change, high-bit
data will be lost during page programming.

Signed-off-by: Chin-Ting Kuo <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-aspeed-smc.c

···
 				     const struct spi_mem_op *op)
 {
 	int ret;
+	int io_mode = aspeed_spi_get_io_mode(op);
 
 	aspeed_spi_start_user(chip);
 	ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, op->addr.val, op->cmd.opcode);
 	if (ret < 0)
 		goto stop_user;
+
+	aspeed_spi_set_io_mode(chip, io_mode);
+
 	aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out, op->data.nbytes);
 stop_user:
 	aspeed_spi_stop_user(chip);