Re: Regression on next-20140116 [Was: [PATCH 3/3 v4] usb: chipidea:hw_phymode_configure moved before ci_usb_phy_init]

[Chris Ruehl]

On Thursday, January 23, 2014 09:22 AM, Peter Chen wrote:
> On Wed, Jan 22, 2014 at 10:41:33PM +0100, Uwe Kleine-König wrote:
> > Hello,
> >
> > On Wed, Jan 22, 2014 at 10:49:51AM +0100, Uwe Kleine-König wrote:
> > > On Tue, Dec 03, 2013 at 04:01:50PM +0800, Chris Ruehl wrote:
> > > > usb: chipidea: hw_phymode_configure moved before ci_usb_phy_init
> > > > hw_phymode_configure configures the PORTSC registers and allow the
> > > > following phy_inits to operate on the right parameters. This fix a problem
> > > > where the UPLI (ISP1504) could not detected, because the Viewport was not
> > > > available and read the viewport return 0's only.
> > > This patch (or a later revision of it to be more exact) made it into
> > > mainline as cd0b42c2a6d2.
> > >
> > > On an i.MX27 based machine I'm hitting an oops (see below) on
> > > next-20140116 + a few patches. (I didn't switch to 3.13+ yet, as I think
> > > not everything I need has landed there.) The oops goes away (and still
> > > better, lsusb reports my connected devices instead of "unable to
> > > initialize libusb: -99") when I do at least one of the following:
> > >
> > >   - set CONFIG_USB_CHIPIDEA=y instead of =m
> > >   - revert commit
> > >        cd0b42c2a6d2 (usb: chipidea: put hw_phymode_configure before ci_usb_phy_init)
> > I debugged that a bit further and the problem is that
> > hw_phymode_configure depends on the phy's clk being enabled (i.e.
> > usb_ipg_gate) and this is only enforced in ci_usb_phy_init (via
> > usb_phy_init -> usb_gen_phy_init). When CONFIG_USB_CHIPIDEA=y the init
> > call to disable all unused clocks wasn't run yet and so the clock is
> > still on as this is the boot default.
> Hi Uwe,
> I am a little puzzled at your platform
>
> - Which phy you have used? ulpi phy ,internal phy or other external phy?
> - If you use ulpi phy, why you still need to use nop phy driver?
>   Besides, according to chris patch, the ulpi can only be visited after
> hw_phymode_configure?
> - Do you have some hardware related operation at phy's probe? If it exists,
> why not move it to phy->init?
>
> Peter
Peter,
I think thats my fault, I send Uwe my patches which call the phy-ulpi 
from the nop driver
in order to get the ISP1504 running with my board.

Its obversely wrong to call an other driver from the nop
see:  [PATCH 3/3] usb: phy-generic: Add ULPI VBUS support and the 
concerns from
Heikki (mail-list linux-usb)

Uwe we may work together on this.

Chris

> > Considering that it's already late today and that I don't know the
> > chipidea driver I'm sure there are people who can come up with a better
> > patch with less effort than me. Any volunteers?
> >
> > Best regards
> > Uwe
> >
> > --
> > Pengutronix e.K.                           | Uwe Kleine-König            |
> > Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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