I'm updating our WhiteHEAT driver, and would like to have URB queueing
working. I'm using drivers/usb/host/uhci.c. After some time of
submitting queued OUT URBS, the system stops. uhci_interrupt() stops
being entered, ie, the hardware stops generating interrupts. My
machine is still fine in all other regards, so it's not a
dead/livelock. It does not appear to be a problem with the toggle bit.
With the analyser we see that the bus stops mostly. The SOF item is
still "running" (sorry for the horrible USB terminology), but the IN
token on EP7 is not being submitted to the WhiteHEAT. If I change the
driver to use only one URB on OUT then this does not occur.
Below is the output of /proc/drivers/uhci/hc0. I'm not knowledgeable
enough to see any problems in it. I'm hoping someone here can spot
something obvious.
What I do see, which may not be problems:
- Queued QH dfe53180 is 'link'ed from two different QHs
- TD dfe5a270 'link's to a QH, instead of having UHCI_PTR_TERM like
the rest
- Queued QH dfe530f0 'link's to dfe53092, which doesn't seem to exist
- The Queued QH list is pointed to twice
I'm willing to do testing.
..Stu
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)
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