[U-Boot] Fastboot and MUSB driver on OMAP3

[Paul Kocialkowski]

> The SET_ADDRESS request is received just fine, it then sets
> musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; but no IRQ arrives to trigger
> another call to musb_g_ep0_irq. Eventually, the host just sends back
> another SET_REQUEST. Looking at dmesg on the host (Device not responding
> to set address), I guess that the device should send something back and
> it apparently doesn't.
> 
> Do you have any clue?

To get a better understanding of what is going on, I added debug prints
to the Linux kernel (since that musb-new driver is apparently a direct
copy of the Linux code). In Linux, everything is working nicely (for
instance with ADB on Android). The relevant part is this:

[    8.616943] adb_open
[    8.674926] generic_interrupt: 1 0 0
[    8.678680] ** IRQ peripheral usb0001 tx0000 rx0000
[    8.683807] [ED_MC]1-2.<INT>USB_SUSPEND
[    8.777709] generic_interrupt: 4 0 0
[    8.781433] ** IRQ peripheral usb0004 tx0000 rx0000
[    8.893463] omapdss DSI error: DSI CIO error, cio irqstatus 400
[    8.893493] DSI CIO IRQ 0x400: ERRCONTROL1
[    8.929138] generic_interrupt: 8 1 0
[    8.932922] ** IRQ peripheral usb0008 tx0001 rx0000
[    8.938049] musb_g_ep0_irq: Current EP0 state is 0x1
[    8.943267] service_zero_data_request: SET_ADDRESS
[    8.948303] new ep0 state is 4
[    8.951507] Writing ACKPEND 0x48
[    8.954925] generic_interrupt: 8 1 0
[    8.958679] ** IRQ peripheral usb0008 tx0001 rx0000
[    8.963806] musb_g_ep0_irq: Current EP0 state is 0x4
[    8.969024] musb_g_ep0_irq: Actually setting address now!
[    8.974670] musb_g_ep0_irq: MUSB_EP0_STAGE_STATUSOUT now
[    8.983337] omapdss DSI error: DSI CIO error, cio irqstatus 100400
[    8.983367] DSI CIO IRQ 0x100400: ERRCONTROL1 ERRCONTENTIONLP0_1
[    9.077239] generic_interrupt: 8 1 0
[    9.080993] ** IRQ peripheral usb0008 tx0001 rx0000
[    9.086120] musb_g_ep0_irq: Current EP0 state is 0x0
[    9.091400] generic_interrupt: 8 1 0

To put in perspective with my current U-Boot log:

musb_register
musb_init_controller
omap2430_musb_init
HS USB OTG: revision 0x40, sysconfig 0x1008, sysstatus 0x1, intrfsel
0x1, simenable  0x0
omap2430_musb_disable
musb_gadget_setup
USB Peripheral mode controller at 480ab000 using PIO, IRQ 0
Hit any key to stop autoboot:  0
usb_gadget_register_driver
musb_gadget_start
musb_start
omap2430_musb_enable
fastboot_add
adding 'f_fastboot'/9fe50480 to config 'usb_dnload'/9fe503c0
fastboot_bind IN
fastboot_bind OUT
generic_interrupt: 45 1 0
** IRQ peripheral usb002d tx0001 rx0000
<== Power=f0, DevCtl=98, int_usb=0x2d
csr 0001, count 8, myaddr 0, ep0stage idle
musb-hdrc: peripheral reset irq lost!
musb_g_ep0_irq: power: 0xf0 speed: 0x3
new ep0 state is 6
service_zero_data_request()
service_zero_data_request: SET_ADDRESS
new ep0 state is 4
Writing ACKPEND 0x48
generic_interrupt: 1 0 0
** IRQ peripheral usb0001 tx0000 rx0000
<== Power=e0, DevCtl=99, int_usb=0x1
generic_interrupt: 4 0 0
** IRQ peripheral usb0004 tx0000 rx0000
<== Power=f0, DevCtl=99, int_usb=0x4
generic_interrupt: 8 0 0
** IRQ peripheral usb0008 tx0000 rx0000
<== Power=f0, DevCtl=99, int_usb=0x8
generic_interrupt: 8 0 0
** IRQ peripheral usb0008 tx0000 rx0000
<== Power=f0, DevCtl=99, int_usb=0x8

The difference between both is apparently that the first IRQ I get in
U-Boot has, in addition to TX, an USB IRQ with value 0x2D.
0x2D is MUSB_INTR_DISCONNECT | MUSB_INTR_SUSPEND | MUSB_INTR_RESET |
MUSB_INTR_BABBLE

I'm a bit worried about MUSB_INTR_DISCONNECT, which normally indicates
that the device was disconnected. In any case, I'm not getting the
second TX message which is supposed to let the actual address set take
place.

I would appreciate a some highlights from people using this on the
BeagleBoard, where it is apparently supposed to work. My current code
(including debug prints) is at:
http://git.code.paulk.fr/gitweb/?p=u-boot-sniper.git;a=shortlog;h=refs/heads/debug

Thanks, have a nice holiday season!

-- 
Paul Kocialkowski, Replicant developer

Replicant is a fully free Android distribution running on several
devices, a free software mobile operating system putting the emphasis on
freedom and privacy/security.

Website: http://www.replicant.us/
Blog: http://blog.replicant.us/
Wiki/tracker/forums: http://redmine.replicant.us/
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