From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: bhelgaas@google.com, rafael.j.wysocki@intel.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
stable@vger.kernel.org
Subject: [PATCH v4] PCI / PM: Always check PME wakeup capability for runtime wakeup support
Date: Mon, 7 May 2018 14:11:20 +0800 [thread overview]
Message-ID: <20180507061120.3683-1-kai.heng.feng@canonical.com> (raw)
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 to D3hot, which can
not generate any PME#.
usb_hcd_pci_probe() unconditionally 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.
In addition, change wakeup flag passed to pci_target_state() from false
to true, because we want to find the deepest state that the device can
still generate PME#. In this case, it's D0 for the device in question.
Fixes: de3ef1eb1cd0 ("PM / core: Drop run_wake flag from struct dev_pm_info")
Cc: stable@vger.kernel.org # 4.13+
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v4: Correct some errors in commit log.
v3: State the reason why the wakeup flag gets changed.
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 a04197ce767d..c2616cad3a1d 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2138,16 +2138,16 @@ 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;
--
2.17.0
next reply other threads:[~2018-05-07 6:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 6:11 Kai-Heng Feng [this message]
2018-05-07 21:48 ` [PATCH v4] PCI / PM: Always check PME wakeup capability for runtime wakeup support Bjorn Helgaas
2018-05-08 22:14 ` Rafael J. Wysocki
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