serial: samsung: honor fifosize from dts at first

Currently for platforms which passes UART fifosize from DT gets
override by local driver structure "s3c24xx_serial_drv_data",
which is not intended. Change the code to honor fifosize from
device tree at first.
Signed-off-by: Tamseel Shams <m.shams@samsung.com>
Link: https://lore.kernel.org/r/20240220101227.80741-1-m.shams@samsung.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung_tty.c

@@ -1951,7 +1951,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct s3c24xx_uart_port *ourport;
 	int index = probe_index;
-	int ret, prop = 0;
+	int ret, prop = 0, fifosize_prop = 1;
 
 	if (np) {
 		ret = of_alias_get_id(np, "serial");
@@ -1991,8 +1991,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	ourport->port.iotype = ourport->info->iotype;
 
 	if (np) {
-		of_property_read_u32(np,
-			"samsung,uart-fifosize", &ourport->port.fifosize);
+		fifosize_prop = of_property_read_u32(np, "samsung,uart-fifosize",
+				&ourport->port.fifosize);
 
 		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
 			switch (prop) {
@@ -2010,10 +2010,13 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (ourport->drv_data->fifosize[index])
-		ourport->port.fifosize = ourport->drv_data->fifosize[index];
-	else if (ourport->info->fifosize)
-		ourport->port.fifosize = ourport->info->fifosize;
+	if (fifosize_prop) {
+		if (ourport->drv_data->fifosize[index])
+			ourport->port.fifosize = ourport->drv_data->fifosize[index];
+		else if (ourport->info->fifosize)
+			ourport->port.fifosize = ourport->info->fifosize;
+	}
+
 	ourport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SAMSUNG_CONSOLE);
 
 	/*