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 <chin-ting_kuo@aspeedtech.com>
Link: https://patch.msgid.link/20251114101042.1520997-3-chin-ting_kuo@aspeedtech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: chintingkuo

drivers/spi/spi-aspeed-smc.c

@@ -263,11 +263,15 @@ static ssize_t aspeed_spi_write_user(struct aspeed_spi_chip *chip,
 				     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);