[PATCH v12 00/13] Add tested id switch and vbus connect detect support for Chipidea

[Marek Vasut]

Hi Peter,

> On Fri, Jul 12, 2013 at 06:04:43AM +0200, Marek Vasut wrote:
> > Hi Peter,
> > 
> > > On Thu, Jul 11, 2013 at 07:57:19PM +0200, Marek Vasut wrote:
> > > > Hi Peter,
> > > > 
> > > > > This patchset adds tested otg id switch function and
> > > > > vbus connect and disconnect detection for chipidea driver.
> > > > > And fix kinds of bugs found at chipidea drivers after enabling
> > > > > id and vbus detection.
> > > > > 
> > > > > This patch is fully tested at imx6 sabresd platform.
> > > > > My chipidea repo: https://github.com/hzpeterchen/linux-usb.git
> > > > > 
> > > > > Changes for v12:
> > > > > - Rebased greg's usb-next tree (3.10.0-rc7+)
> > > > > - Split more small patches for single function and fix.
> > > > 
> > > > I tested the patchset. Here are the results:
> > > > 
> > > > - VBUS switching
> > > > 
> > > > I'm no longer getting any ID interrupts at all when I apply the patch
> > > > below. The board stays in HOST mode all the time. If I configure it
> > > > as peripheral, it works as peripheral. Note with [1], I was able to
> > > > switch from Peripheral->Host , not the other way around.
> > > 
> > > Thanks for your testing. But first, can you have me check
> > > if your ID wakeup is enabled?
> > 
> > ID wakeup? How do I check?
> 
> See otgsc at controller register, the ID wakeup enable is bit 24.

Yes, ID interrupt (IDIE) is set.

I noticed this backtrace in the kernel bootlog, but this only happens if the 
dr_mode="otg" , it comes from the host-mode irq handler :

[    2.757563] irq 238: nobody cared (try booting with the "irqpoll" option)
[    2.764398] CPU: 0 PID: 1 Comm: swapper Not tainted 3.10.0-
next-20130711-00013-g011c4b3-dirty #703
[    2.773445] [<80013878>] (unwind_backtrace+0x0/0xe8) from [<80011644>] 
(show_stack+0x10/0x14)
[    2.782027] [<80011644>] (show_stack+0x10/0x14) from [<800659f4>] 
(__report_bad_irq.isra.6+0x20/0xe0)
[    2.791286] [<800659f4>] (__report_bad_irq.isra.6+0x20/0xe0) from 
[<80065c98>] (note_interrupt+0x16c/0x230)
[    2.801063] [<80065c98>] (note_interrupt+0x16c/0x230) from [<80064000>] 
(handle_irq_event_percpu+0x10c/0x1a4)
[    2.811010] [<80064000>] (handle_irq_event_percpu+0x10c/0x1a4) from 
[<800640e8>] (handle_irq_event+0x50/0x78)
[    2.820958] [<800640e8>] (handle_irq_event+0x50/0x78) from [<8006652c>] 
(handle_level_irq+0x88/0x10c)
[    2.830210] [<8006652c>] (handle_level_irq+0x88/0x10c) from [<800638d0>] 
(generic_handle_irq+0x28/0x3c)
[    2.839637] [<800638d0>] (generic_handle_irq+0x28/0x3c) from [<8000f84c>] 
(handle_IRQ+0x30/0x84)
[    2.848461] [<8000f84c>] (handle_IRQ+0x30/0x84) from [<80012160>] 
(__irq_svc+0x40/0x6c)
[    2.856510] [<80012160>] (__irq_svc+0x40/0x6c) from [<80022a44>] 
(__do_softirq+0x90/0x1d8)
[    2.864812] [<80022a44>] (__do_softirq+0x90/0x1d8) from [<80022edc>] 
(irq_exit+0x98/0xd4)
[    2.873025] [<80022edc>] (irq_exit+0x98/0xd4) from [<8000f850>] 
(handle_IRQ+0x34/0x84)
[    2.880980] [<8000f850>] (handle_IRQ+0x34/0x84) from [<80012160>] 
(__irq_svc+0x40/0x6c)
[    2.889020] [<80012160>] (__irq_svc+0x40/0x6c) from [<8001d724>] 
(vprintk_emit+0x1bc/0x524)
[    2.897411] [<8001d724>] (vprintk_emit+0x1bc/0x524) from [<804da5a4>] 
(printk+0x30/0x40)
[    2.905551] [<804da5a4>] (printk+0x30/0x40) from [<80630138>] 
(mousedev_init+0x4c/0x60)
[    2.913617] [<80630138>] (mousedev_init+0x4c/0x60) from [<806178fc>] 
(do_one_initcall+0x94/0x14c)
[    2.922537] [<806178fc>] (do_one_initcall+0x94/0x14c) from [<80617b20>] 
(kernel_init_freeable+0x16c/0x22c)
[    2.932230] [<80617b20>] (kernel_init_freeable+0x16c/0x22c) from [<804d8cbc>] 
(kernel_init+0x8/0x150)
[    2.941486] [<804d8cbc>] (kernel_init+0x8/0x150) from [<8000ea70>] 
(ret_from_fork+0x14/0x24)
[    2.949932] handlers:
[    2.952227] [<8033fc58>] ci_irq
[    2.955388] Disabling IRQ #238

btw. do you have any kind of other CI13xxx documentation than what's in the CPU 
datasheets ?

Best regards,
Marek Vasut