[PATCH v4 5/5] serial: qcom-geni: Load UART qup Firmware from linux side

[Viken Dadhaniya]

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

Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@xxxxxxxxxxx>
Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@xxxxxxxxxxx>
Signed-off-by: Viken Dadhaniya <quic_vdadhani@xxxxxxxxxxx>
---
Dependencies:

This patch depends on patch 2 of this series.

v3 -> v4:

- Add a patch dependency note.

v3 Link: https://lore.kernel.org/linux-arm-msm/20250303124349.3474185-10-quic_vdadhani@xxxxxxxxxxx/

v2 -> v3:

- Load firmware only if the protocol is invalid.

v2 Link: https://lore.kernel.org/linux-arm-msm/20250124105309.295769-9-quic_vdadhani@xxxxxxxxxxx/

v1 -> v2:

- No change.

v1 Link: https://lore.kernel.org/linux-arm-msm/20241204150326.1470749-8-quic_vdadhani@xxxxxxxxxxx/
---
---
 drivers/tty/serial/qcom_geni_serial.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 0293b6210aa6..9f905ae3c127 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1161,7 +1161,13 @@ 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;
 	}
-- 
2.34.1