From: Alan Stern [mailto:[EMAIL PROTECTED]
> However, there is one possibility... Older Intel UHCI
> hardware (the PIIX3
> Neptune chipset) has an erratum that causes the controller
> sometimes to
> update a completed TD's status but not update the QH's
> element pointer.
> As a result the controller remains stuck on the completed TD and never
> advances to the next one. Could that be happening to you?
> You can find
> out by building the driver with CONFIG_USB_DEBUG turned on
> and loading it
> with
>
> modprobe uhci debug=3
>
> Then the file under /proc/driver/uhci/ corresponding to the
> controller in
> use will contain debugging information showing the current
> state of the
> schedule. If you examine that while the queue is stopped
> you'll be able
> to see exactly what's wrong.
Hm, interesting. I posted this a few days ago, but here it is again;
the output of /proc/driver/uhci/hc0 when the queueing breaks. I don't
think I had debug turned on at the time though.
Also attached below is the debug=3 version. I don't think the errata
is the cause though; if I read that right the TDs are all still
active.
..Stu
Original:
HC status
usbcmd = 00c1 Maxp64 CF RS
usbstat = 0000
usbint = 000f
usbfrnum = (0)d30
flbaseadd = 1fe54000
sof = 40
stat1 = 0480
stat2 = 0495 PortEnabled PortConnected
Frame List
Skeleton TD's
- skel_term_td
[dfe5a1b0] link (1fe5a1b0) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
Skeleton QH's
- skel_bulk_qh
[dfe530c0] link (1fe53152) element (1fe5a1e0)
0: [dfe5a1e0] link (00000001) e3 SPD IOC Active NAK Length=7ff MaxLen=3f
DT0 EndPt=7 Dev=8, PID=69(IN) (buf=1f9ae660)
[dfe53150] link (1fe53182) element (1fe5a270)
0: [dfe5a270] link (1fe53122) e3 SPD IOC Active NAK Length=3f MaxLen=3f
DT1 EndPt=4 Dev=8, PID=e1(OUT) (buf=1f9ae160)
-- Queued QH's:
[dfe53120] link (1fe53182) element (1fe5a2a0)
0: [dfe5a2a0] link (00000001) e3 SPD IOC Active Length=0 MaxLen=3f DT0
EndPt=4 Dev=8, PID=e1(OUT) (buf=1f9ae360)
[dfe53180] link (1fe530f2) element (1fe5a210)
0: [dfe5a210] link (00000001) e3 SPD IOC Active Length=0 MaxLen=3f DT0
EndPt=4 Dev=8, PID=69(IN) (buf=1f9ae1e0)
[dfe530f0] link (1fe53092) element (1fe5a240)
0: [dfe5a240] link (00000001) e3 SPD IOC Active Length=0 MaxLen=1 DT0
EndPt=7 Dev=8, PID=e1(OUT) (buf=1f9ae3e0)
With debug=3:
HC status
usbcmd = 00c1 Maxp64 CF RS
usbstat = 0000
usbint = 000f
usbfrnum = (1)a54
flbaseadd = 1dc5c000
sof = 40
stat1 = 0480
stat2 = 0495 PortEnabled PortConnected
Frame List
Skeleton TD's
- skel_term_td
[dccee1b0] link (1ccee1b0) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int256_td
[dccee180] link (1ccee150) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int128_td
[dccee150] link (1ccee120) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int64_td
[dccee120] link (1ccee0f0) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int32_td
[dccee0f0] link (1ccee0c0) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int16_td
[dccee0c0] link (1ccee090) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int8_td
[dccee090] link (1ccee060) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int4_td
[dccee060] link (1ccee030) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int2_td
[dccee030] link (1ccee000) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
- skel_int1_td
[dccee000] link (1cbe1002) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f,
PID=69(IN) (buf=00000000)
Skeleton QH's
- skel_ls_control_qh
[dcbe1000] link (1cbe1032) element (00000001)
urbp == NULL
- skel_hs_control_qh
[dcbe1030] link (1cbe1062) element (00000001)
urbp == NULL
- skel_bulk_qh
[dcbe1060] link (1cbe1092) element (00000001)
urbp == NULL
[dcbe1180] link (1cbe10f2) element (1ccee210)
0: [dccee210] link (00000001) e3 SPD IOC Active NAK Length=7ff MaxLen=3f
DT0 EndPt=4 Dev=3, PID=69(IN) (buf=1d315fa4)
[dcbe10f0] link (1cbe11b2) element (1ccee270)
0: [dccee270] link (1cbe1122) e3 SPD IOC Active NAK Length=3f MaxLen=3f
DT1 EndPt=4 Dev=3, PID=e1(OUT) (buf=1d315c8c)
-- Queued QH's:
[dcbe1120] link (1cbe11b2) element (1ccee2a0)
0: [dccee2a0] link (1cbe1212) e3 SPD IOC Active Length=0 MaxLen=3f DT0
EndPt=4 Dev=3, PID=e1(OUT) (buf=1d315cd4)
[dcbe1210] link (1cbe11b2) element (1ccee2d0)
0: [dccee2d0] link (1cbe10c2) e3 SPD IOC Active Length=0 MaxLen=3f DT1
EndPt=4 Dev=3, PID=e1(OUT) (buf=1d315d1c)
[dcbe10c0] link (1cbe11b2) element (1ccee240)
0: [dccee240] link (00000001) e3 SPD IOC Active Length=0 MaxLen=3f DT0
EndPt=4 Dev=3, PID=e1(OUT) (buf=1d315d64)
[dcbe11b0] link (1cbe1152) element (1ccee1e0)
0: [dccee1e0] link (00000001) e3 SPD IOC Active NAK Length=7ff MaxLen=3f
DT0 EndPt=7 Dev=3, PID=69(IN) (buf=1d519344)
[dcbe1150] link (1cbe1092) element (1ccee300)
0: [dccee300] link (00000001) e3 SPD IOC Active Length=0 MaxLen=1 DT0
EndPt=7 Dev=3, PID=e1(OUT) (buf=1d51926c)
- skel_term_qh
[dcbe1090] link (00000001) element (1ccee1b0)
urbp == NULL
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