Bug 203673

Summary:	xHCI can't get woken up by plugging USB devices when it's runtime suspended to D0
Product:	Drivers	Reporter:	Kai-Heng Feng (kai.heng.feng)
Component:	PCI	Assignee:	drivers_pci (drivers_pci)
Status:	RESOLVED CODE_FIX
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	v5.2-rc1	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	lspci -vv acpidump dmesg

Description Kai-Heng Feng 2019-05-22 04:18:43 UTC

Created attachment 282905 [details]
lspci -vv

Comment 1 Kai-Heng Feng 2019-05-22 04:26:10 UTC

Vendor also confirms it's not supposed to be runtime suspended, so it's _S0W reports D0:

# acpidbg -b 'ex \_SB.PCI0.XHC0._S0W'
Evaluating \_SB.PCI0.XHC0._S0W
Evaluation of \_SB.PCI0.XHC0._S0W returned object 000000005b47428a, external buffer length 18
 [Integer] = 0000000000000000

Comment 2 Kai-Heng Feng 2019-05-22 04:29:02 UTC

Created attachment 282907 [details]
acpidump

Comment 3 Kai-Heng Feng 2019-05-22 15:08:51 UTC

Symptom and steps to reproduce the issue:
1) Enable runtime power management for the xHC controller, it's in D0 and PME signaling is enabled:
Status: D0 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
2) Plug a USB device to USB port
3) Nothing happens

Comment 4 Kai-Heng Feng 2019-06-05 07:45:38 UTC

Created attachment 283109 [details]
dmesg

Comment 5 Kai-Heng Feng 2019-10-25 07:00:37 UTC

Fixed by 6c4c5a0f0180137dba328d4f3cf9bd48961e7d24 x86/PCI: Avoid AMD FCH XHCI USB PME# from D0 defect