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hsu: add runtime pm support

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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>
This commit is contained in:
Kristen Carlson Accardi
2011-08-26 11:35:16 +01:00
committed by Greg Kroah-Hartman
parent 0b058353ab
commit 88e5173ff1
1 changed files with 47 additions and 0 deletions
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47
drivers/tty/serial/mfd.c
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@@ -38,6 +38,7 @@
#include <linux/pci.h> #include <linux/pci.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/pm_runtime.h>
#define HSU_DMA_BUF_SIZE 2048 #define HSU_DMA_BUF_SIZE 2048
@@ -764,6 +765,8 @@ static int serial_hsu_startup(struct uart_port *port)
container_of(port, struct uart_hsu_port, port); container_of(port, struct uart_hsu_port, port);
unsigned long flags; unsigned long flags;
pm_runtime_get_sync(up->dev);
/* /*
* Clear the FIFO buffers and disable them. * Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios()) * (they will be reenabled in set_termios())
@@ -871,6 +874,8 @@ static void serial_hsu_shutdown(struct uart_port *port)
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT); UART_FCR_CLEAR_XMIT);
serial_out(up, UART_FCR, 0); serial_out(up, UART_FCR, 0);
pm_runtime_put(up->dev);
} }
static void static void
@@ -1249,6 +1254,39 @@ static int serial_hsu_resume(struct pci_dev *pdev)
#define serial_hsu_resume NULL #define serial_hsu_resume NULL
#endif #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 */ /* temp global pointer before we settle down on using one or four PCI dev */
static struct hsu_port *phsu; static struct hsu_port *phsu;
@@ -1315,6 +1353,9 @@ static int serial_hsu_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, uport); pci_set_drvdata(pdev, uport);
} }
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_allow(&pdev->dev);
return 0; return 0;
err_disable: err_disable:
@@ -1411,6 +1452,9 @@ static void serial_hsu_remove(struct pci_dev *pdev)
if (!priv) if (!priv)
return; 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 */ /* For port 0/1/2, priv is the address of uart_hsu_port */
if (pdev->device != 0x081E) { if (pdev->device != 0x081E) {
up = priv; up = priv;
@@ -1438,6 +1482,9 @@ static struct pci_driver hsu_pci_driver = {
.remove = __devexit_p(serial_hsu_remove), .remove = __devexit_p(serial_hsu_remove),
.suspend = serial_hsu_suspend, .suspend = serial_hsu_suspend,
.resume = serial_hsu_resume, .resume = serial_hsu_resume,
.driver = {
.pm = &serial_hsu_pm_ops,
},
}; };
static int __init hsu_pci_init(void) static int __init hsu_pci_init(void)