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| author | Adrian Hunter | 2017-03-14 14:21:58 +0100 |
|---|---|---|
| committer | Bjorn Helgaas | 2017-03-14 21:01:28 +0100 |
| commit | 50b2b540c00941ced618df9deafccc30826b13b5 (patch) | |
| tree | ca466e0522d0bdc168143c07556dd5764da53814 | |
| parent | Linux 4.11-rc1 (diff) | |
| download | kernel-qcow2-linux-50b2b540c00941ced618df9deafccc30826b13b5.tar.gz kernel-qcow2-linux-50b2b540c00941ced618df9deafccc30826b13b5.tar.xz kernel-qcow2-linux-50b2b540c00941ced618df9deafccc30826b13b5.zip | |
PCI/PM: Don't sleep at all when d3_delay or d3cold_delay is zero
msleep() still sleeps 1 jiffy even when told to sleep for zero
milliseconds. That can end up being 1-2 milliseconds or more. In the
cases of d3_delay and d3cold_delay, that unnecessarily increases suspend
and/or resume latencies.
Do not sleep at all for the respective cases if d3_delay is zero or
d3cold_delay is zero.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/pci/pci.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 7904d02ffdb9..9779483f81fd 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -66,7 +66,8 @@ static void pci_dev_d3_sleep(struct pci_dev *dev) if (delay < pci_pm_d3_delay) delay = pci_pm_d3_delay; - msleep(delay); + if (delay) + msleep(delay); } #ifdef CONFIG_PCI_DOMAINS @@ -827,7 +828,8 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) * because have already delayed for the bridge. */ if (dev->runtime_d3cold) { - msleep(dev->d3cold_delay); + if (dev->d3cold_delay) + msleep(dev->d3cold_delay); /* * When powering on a bridge from D3cold, the * whole hierarchy may be powered on into |