linux-kernel - Re: [RFT PATCH 2/2] Revert "usb: dwc2: Fix probe problem on bcm2835"

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Date:	Wed, 9 Mar 2016 20:01:50 +0100 (CET)
From:	Stefan Wahren <stefan.wahren@...e.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Michael Niewoehner <linux@...ewoehner.de>,
	Tao Huang <huangtao@...k-chips.com>,
	Julius Werner <jwerner@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	John Youn <johnyoun@...opsys.com>,
	Caesar Wang <caesar.upstream@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Felipe Balbi <balbi@...nel.org>,
	Remi Pommarel <repk@...plefau.lt>
Subject: Re: [RFT PATCH 2/2] Revert "usb: dwc2: Fix probe problem on
 bcm2835"


> Doug Anderson <dianders@...omium.org> hat am 7. März 2016 um 22:30
> geschrieben:
>
>
> Stefan,
>
> On Mon, Mar 7, 2016 at 10:40 AM, Stefan Wahren <stefan.wahren@...e.com> wrote:
> > Hi Doug,
> >
> >> Douglas Anderson <dianders@...omium.org> 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 Raspberry Pi B i get the following:

[    2.084411] dwc2 20980000.usb: mapped PA 20980000 to VA cc880000
[    2.084461] dwc2 20980000.usb: cannot get otg clock
[    2.084549] dwc2 20980000.usb: registering common handler for irq33
[    2.084713] dwc2 20980000.usb: Configuration mismatch. dr_mode forced to host
[    2.153965] dwc2 20980000.usb: Waited 49996 us, 0x00201000 => 0x01001000,
0x00000000 => 0x02002000
[    2.174930] dwc2 20980000.usb: Forcing mode to host

So i changed the delay in patch #1 to msleep(50) and then both patches work like
a charm.

Stefan