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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-06-22 18:35:18 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-06-30 15:48:57 +0300 |
| commit | e9695e4d26d210b81c9c8a11f6983c1190a3a9cc (patch) | |
| tree | 2c83d4e7291b04274e10071e94655ac11c97e948 | |
| parent | d4f08316ad339b7c3b0fd55c2947f4c320ee32d0 (diff) | |
| download | linux-e9695e4d26d210b81c9c8a11f6983c1190a3a9cc.tar.xz | |
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>
| -rw-r--r-- | drivers/pci/pci.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 1993e5e28ea7..c847b5554db6 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1378,11 +1378,21 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) int err; int i, bars = 0; - if (atomic_inc_return(&dev->enable_cnt) > 1) { - pci_update_current_state(dev, dev->current_state); - return 0; /* already enabled */ + /* + * Power state could be unknown at this point, either due to a fresh + * boot or a device removal call. So get the current power state + * so that things like MSI message writing will behave as expected + * (e.g. if the device really is in D0 at enable time). + */ + if (dev->pm_cap) { + u16 pmcsr; + pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); + dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); } + if (atomic_inc_return(&dev->enable_cnt) > 1) + return 0; /* already enabled */ + bridge = pci_upstream_bridge(dev); if (bridge) pci_enable_bridge(bridge); |