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PCI PM: Fix pci_update_current_state

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Currently, PCI devices without the PM capability that are power
manageable by the platform (eg. ACPI) are not handled correctly
by pci_set_power_state(), because their current_state field is not
updated to reflect the new power state of the device.  Fix this by
making pci_update_current_state() accept additional argument
representing the power state of the device as set by the platform.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki
2008-12-27 16:30:52 +01:00
committed by Jesse Barnes
parent eb9c39d031
commit f06fc0b6f8
1 changed files with 6 additions and 3 deletions
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drivers/pci/pci.c
+6 -3
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@@ -525,14 +525,17 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
* pci_update_current_state - Read PCI power state of given device from its * pci_update_current_state - Read PCI power state of given device from its
* PCI PM registers and cache it * PCI PM registers and cache it
* @dev: PCI device to handle. * @dev: PCI device to handle.
* @state: State to cache in case the device doesn't have the PM capability
*/ */
static void pci_update_current_state(struct pci_dev *dev) static void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
{ {
if (dev->pm_cap) { if (dev->pm_cap) {
u16 pmcsr; u16 pmcsr;
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
} else {
dev->current_state = state;
} }
} }
@@ -575,7 +578,7 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
*/ */
int ret = platform_pci_set_power_state(dev, PCI_D0); int ret = platform_pci_set_power_state(dev, PCI_D0);
if (!ret) if (!ret)
pci_update_current_state(dev); pci_update_current_state(dev, PCI_D0);
} }
/* This device is quirked not to be put into D3, so /* This device is quirked not to be put into D3, so
don't put it in D3 */ don't put it in D3 */
@@ -588,7 +591,7 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
/* Allow the platform to finalize the transition */ /* Allow the platform to finalize the transition */
int ret = platform_pci_set_power_state(dev, state); int ret = platform_pci_set_power_state(dev, state);
if (!ret) { if (!ret) {
pci_update_current_state(dev); pci_update_current_state(dev, state);
error = 0; error = 0;
} }
} }