FROMLIST: serial: qcom-geni: Load UART qup Firmware from linux side

Add provision to load firmware of Serial engine for UART protocol from
Linux Execution Environment on running on APPS processor.

Link: https://lore.kernel.org/linux-i2c/20250503111029.3583807-6-quic_vdadhani@quicinc.com/
Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>

Author: Viken Dadhaniya

drivers/tty/serial/qcom_geni_serial.c

@@ -1145,7 +1145,13 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
 	int ret;
 
 	proto = geni_se_read_proto(&port->se);
-	if (proto != GENI_SE_UART) {
+	if (proto == GENI_SE_INVALID_PROTO) {
+		ret = geni_load_se_firmware(&port->se, GENI_SE_UART);
+		if (ret) {
+			dev_err(uport->dev, "UART firmware load failed ret: %d\n", ret);
+			return ret;
+		}
+	} else if (proto != GENI_SE_UART) {
 		dev_err(uport->dev, "Invalid FW loaded, proto: %d\n", proto);
 		return -ENXIO;
 	}