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PCI/PM: Apply D2 delay as milliseconds, not microseconds

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PCI_PM_D2_DELAY is defined as 200, which is milliseconds, but previously we
used udelay(), which only waited for 200 microseconds.  Use msleep()
instead so we wait the correct amount of time.  See PCIe r5.0, sec 5.9.

Link: https://lore.kernel.org/r/20191101204558.210235-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bjorn Helgaas 2019-10-23 17:40:52 -05:00
parent 12bcae44bf
commit 7e24bc347e
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/pci.c
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@ -886,7 +886,7 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
pci_dev_d3_sleep(dev);
else if (state == PCI_D2 || dev->current_state == PCI_D2)
udelay(PCI_PM_D2_DELAY);
msleep(PCI_PM_D2_DELAY);
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);