hsu: add runtime pm support
Doesn't appear to be much to do here, however having the suspend/resume
functions will allow the d3/d0 transitions to be sent by the pci core.
Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index cab52f4..cfa7501 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -38,6 +38,7 @@
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/debugfs.h>
+#include <linux/pm_runtime.h>
#define HSU_DMA_BUF_SIZE 2048
@@ -764,6 +765,8 @@
container_of(port, struct uart_hsu_port, port);
unsigned long flags;
+ pm_runtime_get_sync(up->dev);
+
/*
* Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios())
@@ -871,6 +874,8 @@
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT);
serial_out(up, UART_FCR, 0);
+
+ pm_runtime_put(up->dev);
}
static void
@@ -1249,6 +1254,39 @@
#define serial_hsu_resume NULL
#endif
+#ifdef CONFIG_PM_RUNTIME
+static int serial_hsu_runtime_idle(struct device *dev)
+{
+ int err;
+
+ err = pm_schedule_suspend(dev, 500);
+ if (err)
+ return -EBUSY;
+
+ return 0;
+}
+
+static int serial_hsu_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int serial_hsu_runtime_resume(struct device *dev)
+{
+ return 0;
+}
+#else
+#define serial_hsu_runtime_idle NULL
+#define serial_hsu_runtime_suspend NULL
+#define serial_hsu_runtime_resume NULL
+#endif
+
+static const struct dev_pm_ops serial_hsu_pm_ops = {
+ .runtime_suspend = serial_hsu_runtime_suspend,
+ .runtime_resume = serial_hsu_runtime_resume,
+ .runtime_idle = serial_hsu_runtime_idle,
+};
+
/* temp global pointer before we settle down on using one or four PCI dev */
static struct hsu_port *phsu;
@@ -1315,6 +1353,9 @@
pci_set_drvdata(pdev, uport);
}
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
+
return 0;
err_disable:
@@ -1411,6 +1452,9 @@
if (!priv)
return;
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+
/* For port 0/1/2, priv is the address of uart_hsu_port */
if (pdev->device != 0x081E) {
up = priv;
@@ -1438,6 +1482,9 @@
.remove = __devexit_p(serial_hsu_remove),
.suspend = serial_hsu_suspend,
.resume = serial_hsu_resume,
+ .driver = {
+ .pm = &serial_hsu_pm_ops,
+ },
};
static int __init hsu_pci_init(void)