OMAP: UART: don't do automatic bus-level suspend/resume

Since the omap_device for UART is currently managed inside the idle
path itself,  don't let the bus-level code suspend/resume the UART.

To prevent this, pm_runtime_get() is used when preparing for suspend
and pm_runtime_put() is used when finished with suspend.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 6ffbc924c4d4..ff83e91e6109 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/serial_8250.h>
+#include <linux/pm_runtime.h>
 
 #ifdef CONFIG_SERIAL_OMAP
 #include <plat/omap-serial.h>
@@ -530,14 +531,17 @@ void omap_uart_enable_irqs(int enable)
         struct omap_uart_state *uart;
 
         list_for_each_entry(uart, &uart_list, node) {
-                if (enable)
+                if (enable) {
+                        pm_runtime_put_sync(&uart->pdev->dev);
                         ret = request_threaded_irq(uart->irq, NULL,
                                                    omap_uart_interrupt,
                                                    IRQF_SHARED,
                                                    "serial idle",
                                                    (void *)uart);
-                else
+                } else {
+                        pm_runtime_get_noresume(&uart->pdev->dev);
                         free_irq(uart->irq, (void *)uart);
+                }
         }
 }