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Revert "PCI: PM: Do not read power state in pci_enable_device_flags()"
[ Upstream commit 4d6035f9bf4ea12776322746a216e856dfe46698 ] Revert commit 4514d991d992 ("PCI: PM: Do not read power state in pci_enable_device_flags()") that is reported to cause PCI device initialization issues on some systems. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213481 Link: https://lore.kernel.org/linux-acpi/YNDoGICcg0V8HhpQ@eldamar.lan Reported-by: Michael <phyre@rogers.com> Reported-by: Salvatore Bonaccorso <carnil@debian.org> Fixes: 4514d991d992 ("PCI: PM: Do not read power state in pci_enable_device_flags()") Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1874,11 +1874,21 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
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int err;
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int i, bars = 0;
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if (atomic_inc_return(&dev->enable_cnt) > 1) {
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pci_update_current_state(dev, dev->current_state);
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return 0; /* already enabled */
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/*
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* Power state could be unknown at this point, either due to a fresh
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* boot or a device removal call. So get the current power state
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* so that things like MSI message writing will behave as expected
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* (e.g. if the device really is in D0 at enable time).
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*/
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if (dev->pm_cap) {
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u16 pmcsr;
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pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
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dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
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}
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if (atomic_inc_return(&dev->enable_cnt) > 1)
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return 0; /* already enabled */
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bridge = pci_upstream_bridge(dev);
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if (bridge)
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pci_enable_bridge(bridge);
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