[PATCH v2] serial: 8250-mtk: modify mtk uart power and clock management

[Changqi Hu]

modify mtk uart runtime interface, enable uart clock before register.

Signed-off-by: Changqi Hu <changqi...@mediatek.com>
---
 drivers/tty/serial/8250/8250_mtk.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c 
b/drivers/tty/serial/8250/8250_mtk.c
index b0113d1..a07c8ae 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -389,7 +389,7 @@ static int __maybe_unused mtk8250_runtime_suspend(struct 
device *dev)
        struct mtk8250_data *data = dev_get_drvdata(dev);
        struct uart_8250_port *up = serial8250_get_port(data->line);
 
-       /*wait until UART in idle status*/
+       /* wait until UART in idle status */
        while
                (serial_in(up, MTK_UART_DEBUG0));
 
@@ -426,23 +426,15 @@ static int __maybe_unused mtk8250_runtime_resume(struct 
device *dev)
 static void
 mtk8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
 {
-       struct uart_8250_port *up = up_to_u8250p(port);
-
-       if (!state) {
-               if (!(up->capabilities & UART_CAP_RPM))
-                       mtk8250_runtime_resume(port->dev);
-               else
+       if (!state)
+               if (!mtk8250_runtime_resume(port->dev))
                        pm_runtime_get_sync(port->dev);
-       }
 
        serial8250_do_pm(port, state, old);
 
-       if (state) {
-               if (!(up->capabilities & UART_CAP_RPM))
+       if (state)
+               if (!pm_runtime_put_sync_suspend(port->dev))
                        mtk8250_runtime_suspend(port->dev);
-               else
-                       pm_runtime_put_sync_suspend(port->dev);
-       }
 }
 
 #ifdef CONFIG_SERIAL_8250_DMA
@@ -554,6 +546,9 @@ static int mtk8250_probe(struct platform_device *pdev)
        platform_set_drvdata(pdev, data);
 
        pm_runtime_enable(&pdev->dev);
+       err = mtk8250_runtime_resume(&pdev->dev);
+       if (err)
+               return err;
 
        data->line = serial8250_register_8250_port(&uart);
        if (data->line < 0)
-- 
1.8.1.1.dirty