Stefan,
On Mon, Mar 7, 2016 at 10:40 AM, Stefan Wahren <stefan.wahren@xxxxxxxx> wrote:
> Hi Doug,
>
>> Douglas Anderson <dianders@xxxxxxxxxxxx> hat am 4. März 2016 um 19:23
>> geschrieben:
>>
>>
>> This reverts commit 192cb07f7928 ("usb: dwc2: Fix probe problem on
>> bcm2835") now that we've found the root cause. See the change
>> titled ("usb: dwc2: Add a 10 ms delay to dwc2_core_reset()").
>
> adding a delay of 10 ms after a core reset might be a idea, but applying both
> patches breaks USB support on RPi :-(
>
> I'm getting the wrong register values ...
Ugh. :(
Just out of curiosity, if you loop and time long it takes for the
registers to get to the right state after reset, what do you get?
AKA, pick:
https://chromium-review.googlesource.com/331260
...and let me know what it prints out. On my system I see:
[ 1.990743] dwc2 ff540000.usb: Waited 300001 us, 0x04000400 =>
0x04000400, 0x02000800 => 0x02000800
[ 2.119677] dwc2 ff580000.usb: Waited 9997 us, 0x00100400 =>
0x04000400, 0x00000000 => 0x02000800
I believe the difference in behavior is because of the two different
types of USB controllers (one is OTG and the other is host only).
-Doug
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