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mei: txe: use runtime PG pm domain for non wakeable devices 

For non wakeable devices we can't use pci runtime framework
as we are not able to wakeup from D3 states.
Instead we create new pg runtime domain that only drives TXE power
gating protocol to reduce the power consumption.

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 22:52:06 +02:00 committed by Greg Kroah-Hartman
parent e13fa90ce4
commit d2d56faeba
1 changed files with 49 additions and 0 deletions
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49
drivers/misc/mei/pci-txe.c
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@ -41,6 +41,13 @@ static const struct pci_device_id mei_txe_pci_tbl[] = {
};
MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
#ifdef CONFIG_PM_RUNTIME
static inline void mei_txe_set_pm_domain(struct mei_device *dev);
static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
#else
static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
#endif /* CONFIG_PM_RUNTIME */
static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
{
@ -147,6 +154,14 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
pci_set_drvdata(pdev, dev);
/*
* For not wake-able HW runtime pm framework
* can't be used on pci device level.
* Use domain runtime pm callbacks instead.
*/
if (!pci_dev_run_wake(pdev))
mei_txe_set_pm_domain(dev);
pm_runtime_put_noidle(&pdev->dev);
return 0;
@ -199,6 +214,9 @@ static void mei_txe_remove(struct pci_dev *pdev)
mei_stop(dev);
if (!pci_dev_run_wake(pdev))
mei_txe_unset_pm_domain(dev);
/* disable interrupts */
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
@ -350,6 +368,37 @@ static int mei_txe_pm_runtime_resume(struct device *device)
return ret;
}
/**
* mei_txe_set_pm_domain - fill and set pm domian stucture for device
*
* @dev: mei_device
*/
static inline void mei_txe_set_pm_domain(struct mei_device *dev)
{
struct pci_dev *pdev = dev->pdev;
if (pdev->dev.bus && pdev->dev.bus->pm) {
dev->pg_domain.ops = *pdev->dev.bus->pm;
dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
pdev->dev.pm_domain = &dev->pg_domain;
}
}
/**
* mei_txe_unset_pm_domain - clean pm domian stucture for device
*
* @dev: mei_device
*/
static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
{
/* stop using pm callbacks if any */
dev->pdev->dev.pm_domain = NULL;
}
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM