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Date: Mon, 26 Mar 2018 13:54:35 +0800 From: Kai Heng Feng <kai.heng.feng@...onical.com> To: bhelgaas@...gle.com Cc: rafael.j.wysocki@...el.com, linux-pci@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, stable@...r.kernel.org Subject: Re: [PATCH v2] PCI / PM: Always check PME wakeup capability for runtime wakeup support Hi Bjorn, Rafael, > On Mar 19, 2018, at 10:09 PM, Kai-Heng Feng <kai.heng.feng@...onical.com> > wrote: > > USB controller ASM1042 stops working after commit de3ef1eb1cd0 ("PM / > core: Drop run_wake flag from struct dev_pm_info"). > > The device in question is not power managed by platform firmware, > furthermore, it only supports PME# from D3cold: > Capabilities: [78] Power Management version 3 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0-,D1-,D2-,D3hot-,D3cold+) > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > > Before commit de3ef1eb1cd0, the device never gets runtime suspended. > After that commit, the device gets runtime suspended, so it does not > respond to any PME#. > > usb_hcd_pci_probe() mandatorily calls device_wakeup_enable(), hence > device_can_wakeup() in pci_dev_run_wake() always returns true. > > So pci_dev_run_wake() needs to check PME wakeup capability as its first > condition. > > Fixes: de3ef1eb1cd0 ("PM / core: Drop run_wake flag from struct > dev_pm_info") > Cc: stable@...r.kernel.org # 4.13+ > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com> Is there any improvement I can address? Or do you have any concern about this patch? Kai-Heng > --- > v2: Explicitly check dev->pme_support. > > drivers/pci/pci.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index f6a4dd10d9b0..52821a21fc07 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -2125,16 +2125,16 @@ bool pci_dev_run_wake(struct pci_dev *dev) > { > struct pci_bus *bus = dev->bus; > > - if (device_can_wakeup(&dev->dev)) > - return true; > - > if (!dev->pme_support) > return false; > > /* PME-capable in principle, but not from the target power state */ > - if (!pci_pme_capable(dev, pci_target_state(dev, false))) > + if (!pci_pme_capable(dev, pci_target_state(dev, true))) > return false; > > + if (device_can_wakeup(&dev->dev)) > + return true; > + > while (bus->parent) { > struct pci_dev *bridge = bus->self; > > -- > 2.15.1
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