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xhci: fix runtime pm enabling for quirky Intel hosts 

commit 024d411e9c upstream.

Intel hosts that need the XHCI_PME_STUCK_QUIRK flag should enable
runtime pm by calling xhci_pme_acpi_rtd3_enable() before
usb_hcd_pci_probe() calls pci_dev_run_wake().
Otherwise usage count for the device won't be decreased, and runtime
suspend is prevented.

usb_hcd_pci_probe() only decreases the usage count if device can
generate run-time wake-up events, i.e. when pci_dev_run_wake()
returns true.

This issue was exposed by pci_dev_run_wake() change in
commit 8feaec33b9 ("PCI / PM: Always check PME wakeup capability for
runtime wakeup support")
and should be backported to kernels with that change

Cc: <stable@vger.kernel.org> # 4.13+
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200210134553.9144-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Mathias Nyman 2020-02-10 15:45:52 +02:00 committed by Greg Kroah-Hartman
parent 512dae7753
commit 02e3263600
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/host/xhci-pci.c
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@ -302,6 +302,9 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
if (!usb_hcd_is_primary_hcd(hcd))
return 0;
if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
xhci_pme_acpi_rtd3_enable(pdev);
xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
/* Find any debug ports */
@ -359,9 +362,6 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
HCC_MAX_PSA(xhci->hcc_params) >= 4)
xhci->shared_hcd->can_do_streams = 1;
if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
xhci_pme_acpi_rtd3_enable(dev);
/* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
pm_runtime_put_noidle(&dev->dev);