On Thu, Apr 27, 2006 at 02:29:55PM -0700, Marc Singer wrote:
> > Let me know of this works better for you when connecting to a Windows
> > host using RNDIS.
> >
> > <ftp://ftp.buici.com/pub/arm/gadget/lh7_udc.c>
> >
>
> I've successfully passed all of the USB tests with this driver. There
> were a couple of buglets as well as a serious logic error. All of the
> previous drivers suffered from the same error which is improper
> handling of spurious EP0 interrupts. The old logic was resetting the
> driver mode to look for setup packets when in reality, an OUT transfer
> was under way. This driver now properly ignores the spurious
> interrupt, allowing it to pass test 14.
>
> If you try the driver on Windows, please let me know if it copes well
> with RNDIS.
I may have been a little hasty. This new driver *does* work properly
on the lh79524. It still fails test 14 on the lh7a404. I am now very
suspicious that this is a hardware issue and not a software error.
In a nutshell, on receipt of some ep0 OUT messages, I see all of the
packets from the host including the short packet that completes the
read. I clear the packet ready and set the DATA_END bits and wait for
a new message. The host never sends one. It reports on overflow
which I assume means that it didn't get the response it expected.
This doesn't happen all of the time. I may have as many as 220
exchanges in test 14 before one of the transfers fails.
Once I fixed a race, the lh79524 controller works fine with the driver
as is.
Below is dmesg output from the host.
usbtest 2-2:3.0: TEST 14: 15000 ep0out, 1..256 vary 1
uhci_hcd 0000:00:1d.1: uhci_result_control: failed with status 500000
[ef0e1180] link (2f0e1142) element (1c145300)
Element != First TD
0: [dc145000] link (1c145030) e3 Length=7 MaxLen=7 DT0 EndPt=0 Dev=2c,
PID=2d(SETUP) (buf=2e823a00)
1: [dc145030] link (1c145060) e3 Length=7 MaxLen=7 DT1 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6c0)
2: [dc145060] link (1c145090) e3 Length=7 MaxLen=7 DT0 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6c8)
3: [dc145090] link (1c145180) e3 Length=7 MaxLen=7 DT1 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6d0)
4: [dc145180] link (1c1451e0) e3 Length=7 MaxLen=7 DT0 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6d8)
5: [dc1451e0] link (1c145240) e3 Length=7 MaxLen=7 DT1 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6e0)
6: [dc145240] link (1c1452a0) e3 Length=7 MaxLen=7 DT0 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6e8)
7: [dc1452a0] link (1c145300) e3 Length=2 MaxLen=2 DT1 EndPt=0 Dev=2c,
PID=e1(OUT) (buf=2395d6f0)
8: [dc145300] link (00000001) e3 IOC Stalled Babble NAK Length=7ff
MaxLen=7ff DT1 EndPt=0 Dev=2c, PID=69(IN) (buf=00000000)
usbtest 2-2:3.0: ctrl_out, wlen -75 (expected 51)
It is odd to me that this list shows 7 byte packets when the target is
reading 8 byte packets. In both cases, the byte totals are 51.
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