On 07-10-2022 04:11, Thinh Nguyen wrote:
On Thu, Oct 06, 2022, Ferry Toth wrote:
Hi
On 06-10-2022 04:12, Thinh Nguyen wrote:
On Wed, Oct 05, 2022, Ferry Toth wrote:
Hi,
Thanks!
Does the failure only happen the first time host is initialized? Or can
it recover after switching to device then back to host mode?
I can switch back and forth and device mode works each time, host mode remains
dead.
Ok.
Probably the failure happens if some step(s) in dwc3_core_init() hasn't
completed.
tusb1210 is a phy driver right? The issue is probably because we didn't
initialize the phy yet. So, I suspect placing dwc3_get_extcon() after
initializing the phy will probably solve the dependency problem.
You can try something for yourself or I can provide something to test
later if you don't mind (maybe next week if it's ok).
Yes, the code move I mentioned above "moves dwc3_get_extcon() until after
dwc3_core_init() but just before dwc3_core_init_mode(). AFAIU initially
dwc3_get_extcon() was called from within dwc3_core_init_mode() but only for
case USB_DR_MODE_OTG. So with this change order of events is more or less
unchanged" solves the issue.
I saw the experiment you did from the link you provided. We want to also
confirm exactly which step in dwc3_core_init() was needed.
Ok. I first tried the code move suggested by Andrey (didn't work). Then
after reading the actual code I moved a bit further.
This move was on top of -rc6 without any reverts. I did not make additional
changes to dwc3_core_init()
So current v6.0 has: dwc3_get_extcon - dwc3_get_dr_mode - ... -
dwc3_core_init - .. - dwc3_core_init_mode (not working)
I changed to: dwc3_get_dr_mode - dwc3_get_extcon - .. - dwc3_core_init - ..
- dwc3_core_init_mode (no change)
Then to: dwc3_get_dr_mode - .. - dwc3_core_init - .. - dwc3_get_extcon -
dwc3_core_init_mode (works)
.. are what I believe for this issue irrelevant calls to
dwc3_alloc_scratch_buffers, dwc3_check_params and dwc3_debugfs_init.
Right. Thanks for narrowing it down. There are still many steps in
dwc3_core_init(). We have some suspicion, but we still haven't confirmed
the exact cause of the failure. We can write a proper patch once we know
the reason.
If you would like me to test your suspicion, just tell me what to do :-)
Thanks,
Thinh
