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It generally is better to avoid accessing devices behind bridges that may not be in the D0 power state, because in that case the bridges' secondary buses may not be accessible. For this reason, during the early phase of resume (ie. with interrupts disabled), before restoring the standard config registers of a device, check the power state of the bridge the device is behind and postpone the restoration of the device's config space, as well as any other operations that would involve accessing the device, if that state is not D0. In such cases the restoration of the device's config space will be retried during the "normal" phase of resume (ie. with interrupts enabled), so that the bridge can be put into D0 before that happens. Also, save standard configuration registers of PCI devices during the "normal" phase of suspend (ie. with interrupts enabled), so that the bridges the devices are behind can be put into low power states (we don't put bridges into low power states at the moment, but we may want to do it in the future and it seems reasonable to design for that). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> |
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| .. | ||
| hotplug | ||
| pcie | ||
| .gitignore | ||
| access.c | ||
| bus.c | ||
| dmar.c | ||
| hotplug-pci.c | ||
| hotplug.c | ||
| htirq.c | ||
| intel-iommu.c | ||
| intr_remapping.c | ||
| intr_remapping.h | ||
| iova.c | ||
| irq.c | ||
| Kconfig | ||
| Makefile | ||
| msi.c | ||
| msi.h | ||
| pci-acpi.c | ||
| pci-driver.c | ||
| pci-stub.c | ||
| pci-sysfs.c | ||
| pci.c | ||
| pci.h | ||
| probe.c | ||
| proc.c | ||
| quirks.c | ||
| remove.c | ||
| rom.c | ||
| search.c | ||
| setup-bus.c | ||
| setup-irq.c | ||
| setup-res.c | ||
| slot.c | ||
| syscall.c | ||