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authorBjorn Helgaas <bhelgaas@google.com>2018-03-09 20:06:54 +0300
committerBjorn Helgaas <bhelgaas@google.com>2018-03-12 17:16:20 +0300
commita39bd851dccfdcb89db3d9a6b03283aaf15f310c (patch)
treee547ae9a6e9191f5a0e365ec20c40b58f5a20fbf /drivers/pci/pci-driver.c
parentdcb0453d71e361d4718bb566d99e6ae498284419 (diff)
downloadlinux-a39bd851dccfdcb89db3d9a6b03283aaf15f310c.tar.xz
PCI/PM: Clear PCIe PME Status bit in core, not PCIe port driver
fe31e69740ed ("PCI/PCIe: Clear Root PME Status bits early during system resume") added a .resume_noirq() callback to the PCIe port driver to clear the PME Status bit during resume to work around a BIOS issue. The BIOS evidently enabled PME interrupts for ACPI-based runtime wakeups but did not clear the PME Status bit during resume, which meant PMEs after resume did not trigger interrupts because PME Status did not transition from cleared to set. The fix was in the PCIe port driver, so it worked when CONFIG_PCIEPORTBUS was set. But I think we *always* want the fix because the platform may use PME interrupts even if Linux is built without the PCIe port driver. Move the fix from the port driver to the PCI core so we can work around this "PME doesn't work after waking from a sleep state" issue regardless of CONFIG_PCIEPORTBUS. [bhelgaas: folded in warning fix from Arnd Bergmann <arnd@arndb.de>: https://lkml.kernel.org/r/20180328134747.2062348-1-arnd@arndb.de] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci-driver.c')
-rw-r--r--drivers/pci/pci-driver.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 3bed6beda051..c49af2b679bc 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -714,6 +714,17 @@ static void pci_pm_complete(struct device *dev)
#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_SUSPEND
+static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
+{
+ /*
+ * Some BIOSes forget to clear Root PME Status bits after system
+ * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
+ * Clear those bits now just in case (shouldn't hurt).
+ */
+ if (pci_is_pcie(pci_dev) &&
+ pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT)
+ pcie_clear_root_pme_status(pci_dev);
+}
static int pci_pm_suspend(struct device *dev)
{
@@ -873,6 +884,8 @@ static int pci_pm_resume_noirq(struct device *dev)
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume_early(dev);
+ pcie_pme_root_status_cleanup(pci_dev);
+
if (drv && drv->pm && drv->pm->resume_noirq)
error = drv->pm->resume_noirq(dev);