On Fri, May 08, 2020 at 02:53:41PM +0800, Kai-Heng Feng wrote: > Both Pericom OHCI and EHCI devices support PME# from all power states: > 06:00.0 USB controller [0c03]: Pericom Semiconductor PI7C9X442SL USB OHCI Controller [12d8:400e] (rev 01) (prog-if 10 [OHCI]) > Subsystem: Pericom Semiconductor PI7C9X442SL USB OHCI Controller [12d8:400e] > Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Interrupt: pin A routed to IRQ 17 > Region 0: Memory at a5502000 (32-bit, non-prefetchable) [size=4K] > Capabilities: [80] Power Management version 3 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) > Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME- > > 06:00.2 USB controller [0c03]: Pericom Semiconductor PI7C9X442SL USB EHCI Controller [12d8:400f] (rev 01) (prog-if 20 [EHCI]) > Subsystem: Pericom Semiconductor PI7C9X442SL USB EHCI Controller [12d8:400f] > Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- > Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Interrupt: pin C routed to IRQ 19 > Region 0: Memory at a5500000 (32-bit, non-prefetchable) [size=256] > Capabilities: [80] Power Management version 3 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) > Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME- > > Though my original approach [1] appears to work, further testing shows > that there is a 20% chance PME# won't be asserted when USB device is > plugged. > > So remove the PME support for both devices to make USB plugging works. > > [1] https://lore.kernel.org/lkml/20191227092405.29588-1-kai.heng.feng@xxxxxxxxxxxxx/ > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205981 > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> Applied both with Greg's ack to pci/pm for v5.8, thanks! I added stable tags to both; let me know if you don't want that. > --- > drivers/pci/quirks.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index ca9ed5774eb1..db2590243f0d 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -5568,6 +5568,18 @@ static void pci_fixup_no_d0_pme(struct pci_dev *dev) > } > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x2142, pci_fixup_no_d0_pme); > > +/* > + * Device [12d8:0x400e] and [12d8:0x400f] > + * PME# doesn't always get asserted on all power states claim to support PME# > + */ > +static void pci_fixup_no_pme(struct pci_dev *dev) > +{ > + pci_info(dev, "PME# isn't reliable, disabling it\n"); > + dev->pme_support = 0; > +} > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_PERICOM, 0x400e, pci_fixup_no_pme); > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_PERICOM, 0x400f, pci_fixup_no_pme); > + > static void apex_pci_fixup_class(struct pci_dev *pdev) > { > pdev->class = (PCI_CLASS_SYSTEM_OTHER << 8) | pdev->class; > -- > 2.17.1 >
