[linux-yocto] [PATCH 09/15] serial: 8250_dw: enable runtime PM

[Nilesh Bacchewar]

From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

Backport:
 - Upstream-Status: Pending.
 - Backport fix.
 [https://bitbucket.org/andy-shev/linux/commits/37170b7763ab43c6f49543bc69438cab256a90f6?at=master]

Enable runtime PM for all ports unconditionally. Set autosuspend time to
infinity (-1) to avoid port being shutdown when using, for example, as a
serial console since there is no means to resume it back.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Signed-off-by: Nilesh Bacchewar <nilesh.bacchewar at intel.com>
---
 drivers/tty/serial/8250/8250_dw.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index a5d319e..4ffd160 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -204,18 +204,6 @@ static int dw8250_handle_irq(struct uart_port *p)
 	return 0;
 }
 
-static void
-dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
-{
-	if (!state)
-		pm_runtime_get_sync(port->dev);
-
-	serial8250_do_pm(port, state, old);
-
-	if (state)
-		pm_runtime_put_sync_suspend(port->dev);
-}
-
 static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 			       struct ktermios *old)
 {
@@ -357,7 +345,6 @@ static int dw8250_probe(struct platform_device *pdev)
 	p->mapbase	= regs->start;
 	p->irq		= irq;
 	p->handle_irq	= dw8250_handle_irq;
-	p->pm		= dw8250_do_pm;
 	p->type		= PORT_8250;
 	p->flags	= UPF_SHARE_IRQ | UPF_FIXED_PORT;
 	p->dev		= &pdev->dev;
@@ -486,6 +473,9 @@ static int dw8250_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, data);
 
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, -1);
+
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-- 
1.9.1