From: Adrian Hunter Date: Tue, 14 Mar 2017 13:21:58 +0000 (+0200) Subject: PCI/PM: Don't sleep at all when d3_delay or d3cold_delay is zero X-Git-Tag: v4.12-rc1~65^2~4^2~1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=50b2b540c00941ced618df9deafccc30826b13b5;p=karo-tx-linux.git 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 Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki --- 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