[E/F/Unstable/OEM-OSP1-B] [PATCH 1/1] UBUNTU: SAUCE: PCI: Avoid ASMedia XHCI USB PME# from D0 defect

[Kai-Heng Feng]

> On Feb 14, 2020, at 19:43, Kleber Souza <kleber.souza at canonical.com> wrote:
> 
> On 09.01.20 10:46, Kai-Heng Feng wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1858988
>> 
>> The ASMedia USB XHCI Controller claims to support generating PME# while
>> in D0:
>> 
>> 01:00.0 USB controller: ASMedia Technology Inc. Device 2142 (prog-if 30 [XHCI])
>>        Subsystem: SUNIX Co., Ltd. Device 312b
>>        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-
>> 
>> However PME# only gets asserted when plugging USB 2.0 or USB 1.1
>> devices, but not for USB 3.0 devices.
>> 
>> So remove PCI_PM_CAP_PME_D0 to avoid using PME under D0.
>> 
>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205919
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
> 
> Hi Kai-Heng,
> 
> Please note that this patch hasn't been applied to eoan/linux as per
> Stefan's and Khalid's comments. Please clarify if you really need this
> patch on eoan/linux and if so please adjust the bug nomination
> accordingly.

Yes, E/F are also targeted.
Bug nomination updated.

Thanks!

Kai-Heng

> 
> 
> Thanks,
> Kleber
> 
> 
>> ---
>> drivers/pci/quirks.c | 11 +++++++++++
>> 1 file changed, 11 insertions(+)
>> 
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index db180595592a..138be523f724 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -5469,3 +5469,14 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev)
>> DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, 0x13b1,
>> 			      PCI_CLASS_DISPLAY_VGA, 8,
>> 			      quirk_reset_lenovo_thinkpad_p50_nvgpu);
>> +
>> +/*
>> + * Device [1b21:2142]
>> + * When in D0, PME# doesn't get asserted when plugging USB 3.0 device.
>> + */
>> +static void pci_fixup_no_d0_pme(struct pci_dev *dev)
>> +{
>> +	pci_info(dev, "PME# does not work under D0, disabling it\n");
>> +	dev->pme_support &= ~(PCI_PM_CAP_PME_D0 >> PCI_PM_CAP_PME_SHIFT);
>> +}
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x2142, pci_fixup_no_d0_pme);
>> 
>