On Mar 19, 2018, at 6:00 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
On Sunday, March 18, 2018 8:12:15 PM CET Kai-Heng Feng 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-
That's somewhat unusual, but OK.
Before the commit, the device never gets runtime suspended. After the
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@xxxxxxxxxxxxxxx # 4.13+
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
drivers/pci/pci.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f6a4dd10d9b0..e026d8f313ec 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2125,16 +2125,13 @@ 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;
Why are you removing this check?
Because this is implicitly checked by pci_pme_capable().
But I guess it's better to keep it explicit.
I'll send a v2 to address this.
Kai-Heng
-
/* 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;
Thanks,
Rafael
