Re: usb-related linux-next boot failures

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Hi,

Vignesh R <vigneshr@xxxxxx> writes:
> On Wednesday 28 June 2017 04:00 PM, Tony Lindgren wrote:
>>  Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> [170628 01:32]:
>>> Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> writes:
>>>> On Tue, Jun 27, 2017 at 02:28:56PM -0400, Carlos Hernandez wrote:
>>>>> Still seeing AM57xx/DRA72/DRA7x usb-related boot failures on linux-next...
>>>>
>>>> Is this a regression?  If so, any specific commit that caused it?
>>>
>>> I did ask for a bisection last time but nobody from TI replied ;-)
>>>
>>> https://marc.info/?i=87h8zi4gmx.fsf@xxxxxxxxxxxxxxx
>>>
>>> Can't really help without bisection logs :-)
>> 
>> Seems this warning got add with 04c848d39879 ("genirq: Warn when
>> IRQ_NOAUTOEN is used with shared interrupts"). The fix is to get
>> rid of IRQ_NOAUTOEN and enable_irq for a shared interrupt. Hard
>> to say as the warning line does not match the version of next I
>> have so this should be verified.
>> 
>
> There seems to be two different problems here.
> One is what Tony is pointing to above that throws a first warn dump
> during dwc3_omap_probe().
>
> Second one is the imprecise external abort that happens later:
> [   24.809939] Unhandled fault: imprecise external abort (0x1406) at
> 0x00000000
>
> Bisecting the second issue lead to the first bad commit as:
> commit f54edb539c1167e7a96073848d0afad100df4580
> Author: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
> Date:   Mon Jun 5 17:03:18 2017 +0300
>
>     usb: dwc3: core: initialize ULPI before trying to get the PHY
>
>     If don't reorder initialization like this, we will never be able to
>     get a reference to ULPI PHYs.
>
>     Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
>
>
>
> Reverting above commit from -next seems to help.

reverting will break other things. Seems like we should move
pm_runtime_* operations a little earlier to ensure clocks are enabled
early enough.

-- 
balbi
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