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| author | Kai-Heng Feng <kai.heng.feng@canonical.com> | 2020-05-08 08:53:41 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-05-08 23:54:21 +0200 |
| commit | 68f5fc4ea9ddf9f77720d568144219c4e6452cde (patch) | |
| tree | bc022b028cb0fbd8eb3ea7b487e2f8362fd527eb /Documentation/hwmon | |
| parent | serial: 8250_pci: Move Pericom IDs to pci_ids.h (diff) | |
| download | linux-68f5fc4ea9ddf9f77720d568144219c4e6452cde.tar.xz linux-68f5fc4ea9ddf9f77720d568144219c4e6452cde.zip | |
PCI: Avoid Pericom USB controller OHCI/EHCI PME# defect
Both Pericom OHCI and EHCI devices advertise PME# support 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]
Capabilities: [80] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
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]
Capabilities: [80] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
But testing shows that it's unreliable: there is a 20% chance PME# won't be
asserted when a USB device is plugged.
Remove PME support for both devices to make USB plugging work reliably.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205981
Link: https://lore.kernel.org/r/20200508065343.32751-2-kai.heng.feng@canonical.com
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'Documentation/hwmon')
0 files changed, 0 insertions, 0 deletions