[Bug 214789] ehci-hcd.c ISR

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214789

--- Comment #9 from Scott Arnold (scott.c.arnold@nasa.gov) ---
Hello,
The timing card driver receives no interrupts according to debug.
IRQ16:  IO-APIC   16-fasteoi   ehci_hcd:usb1, hpilo, rt_pcclk

Ehci_hcd entries in /sys/kernel/debug/usb/devices:

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2
B:  Alloc=  0/800 us ( 0%), #Int=  4, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 5.11
S:  Manufacturer=Linux 5.11.17_OBCS_1 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=0000:00:1a.0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 5.11
S:  Manufacturer=Linux 5.11.17_OBCS_1 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=0000:00:1d.0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

I have not tried enabling debug in ehci_hcd yet.
Moving card to another slot did not help, still sharing IRQ 16

Thanks
Scott
-----Original Message-----
From: bugzilla-daemon@bugzilla.kernel.org <bugzilla-daemon@bugzilla.kernel.org> 
Sent: Thursday, October 21, 2021 2:46 PM
To: Arnold, Scott C. (JSC-CD13)[SGT, INC] <scott.c.arnold@nasa.gov>
Subject: [EXTERNAL] [Bug 214789] ehci-hcd.c ISR

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--- Comment #8 from Alan Stern (stern@rowland.harvard.edu) --- How many of
those 90 interrupts were issued by the EHCI host controller as opposed to the
card?

Are there any USB devices attached to the host controller?  What does
/sys/kernel/debug/usb/devices have to say?

Does the card use edge-triggered interrupts rather than level-triggered?

Have you tried adding any debugging messages to ehci_irq to find out what's
going on when it runs?

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