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mei: txe: add runtime pm framework

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Add runtime pm framework for TXE devices.
The runtime pm handlers are used to run
txe power gating isolation protocol.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2014-03-18 22:52:03 +02:00 committed by Greg Kroah-Hartman
parent 180ea05bce
commit cfe5ab8563
2 changed files with 99 additions and 4 deletions
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2
drivers/misc/mei/hw-txe.h
View file

@ -22,6 +22,8 @@
#include "hw.h"
#include "hw-txe-regs.h"
#define MEI_TXI_RPM_TIMEOUT 500 /* ms */
/* Flatten Hierarchy interrupt cause */
#define TXE_INTR_READINESS_BIT 0 /* HISR_INT_0_STS */
#define TXE_INTR_READINESS HISR_INT_0_STS

101
drivers/misc/mei/pci-txe.c
View file

@ -27,6 +27,7 @@
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/mei.h>
@ -137,12 +138,17 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto release_irq;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
err = mei_register(dev);
if (err)
goto release_irq;
pci_set_drvdata(pdev, dev);
pm_runtime_put_noidle(&pdev->dev);
return 0;
release_irq:
@ -187,6 +193,8 @@ static void mei_txe_remove(struct pci_dev *pdev)
return;
}
pm_runtime_get_noresume(&pdev->dev);
hw = to_txe_hw(dev);
mei_stop(dev);
@ -265,15 +273,100 @@ static int mei_txe_pci_resume(struct device *device)
return err;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(mei_txe_pm_ops,
mei_txe_pci_suspend,
mei_txe_pci_resume);
#ifdef CONFIG_PM_RUNTIME
static int mei_txe_pm_runtime_idle(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
dev_dbg(&pdev->dev, "rpm: txe: runtime_idle\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
if (mei_write_is_idle(dev))
pm_schedule_suspend(device, MEI_TXI_RPM_TIMEOUT * 2);
return -EBUSY;
}
static int mei_txe_pm_runtime_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: txe: runtime suspend\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
if (mei_write_is_idle(dev))
ret = mei_txe_aliveness_set_sync(dev, 0);
else
ret = -EAGAIN;
/*
* If everything is okay we're about to enter PCI low
* power state (D3) therefor we need to disable the
* interrupts towards host.
* However if device is not wakeable we do not enter
* D-low state and we need to keep the interrupt kicking
*/
if (!ret && pci_dev_run_wake(pdev))
mei_disable_interrupts(dev);
dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
mutex_unlock(&dev->device_lock);
return ret;
}
static int mei_txe_pm_runtime_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: txe: runtime resume\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
mei_enable_interrupts(dev);
ret = mei_txe_aliveness_set_sync(dev, 1);
mutex_unlock(&dev->device_lock);
dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
return ret;
}
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM
static const struct dev_pm_ops mei_txe_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
mei_txe_pci_resume)
SET_RUNTIME_PM_OPS(
mei_txe_pm_runtime_suspend,
mei_txe_pm_runtime_resume,
mei_txe_pm_runtime_idle)
};
#define MEI_TXE_PM_OPS (&mei_txe_pm_ops)
#else
#define MEI_TXE_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
#endif /* CONFIG_PM */
/*
* PCI driver structure
*/