serial: qcom-geni: Enable PM runtime for serial driver

The GENI serial driver currently handles power resource management
through calls to the statically defined geni_serial_resources_on() and
geni_serial_resources_off() functions. This approach reduces modularity
and limits support for platforms with diverse power management
mechanisms, including resource managed by firmware.

Improve modularity and enable better integration with platform-specific
power management, introduce support for runtime PM. Use
pm_runtime_resume_and_get() and pm_runtime_put_sync() within the
qcom_geni_serial_pm() callback to control resource power state
transitions based on UART power state changes.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
Link: https://lore.kernel.org/r/20250721174532.14022-8-quic_ptalari@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 81f385d900d0612842682f09ee021a1e6ec21622..aa08de659e34ea48bd99d4ee6515009db0da195a 100644 (file)
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1713,10 +1713,10 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
                old_state = UART_PM_STATE_OFF;
 
        if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
-               geni_serial_resources_on(uport);
+               pm_runtime_resume_and_get(uport->dev);
        else if (new_state == UART_PM_STATE_OFF &&
                 old_state == UART_PM_STATE_ON)
-               geni_serial_resources_off(uport);
+               pm_runtime_put_sync(uport->dev);
 
 }
 
@@ -1878,6 +1878,8 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       devm_pm_runtime_enable(port->se.dev);
+
        ret = uart_add_one_port(drv, uport);
        if (ret)
                return ret;
@@ -1909,6 +1911,22 @@ static void qcom_geni_serial_remove(struct platform_device *pdev)
        uart_remove_one_port(drv, &port->uport);
 }
 
+static int __maybe_unused qcom_geni_serial_runtime_suspend(struct device *dev)
+{
+       struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
+       struct uart_port *uport = &port->uport;
+
+       return geni_serial_resources_off(uport);
+}
+
+static int __maybe_unused qcom_geni_serial_runtime_resume(struct device *dev)
+{
+       struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
+       struct uart_port *uport = &port->uport;
+
+       return geni_serial_resources_on(uport);
+}
+
 static int qcom_geni_serial_suspend(struct device *dev)
 {
        struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
@@ -1952,6 +1970,8 @@ static const struct qcom_geni_device_data qcom_geni_uart_data = {
 };
 
 static const struct dev_pm_ops qcom_geni_serial_pm_ops = {
+       SET_RUNTIME_PM_OPS(qcom_geni_serial_runtime_suspend,
+                          qcom_geni_serial_runtime_resume, NULL)
        SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_suspend, qcom_geni_serial_resume)
 };