usb: dwc2: Fix endless deferral probe

[Arnd Bergmann <arnd@arndb.de>]

On Fri, Jan 12, 2018 at 6:51 PM, Mauro Carvalho Chehab
<mchehab@s-opensource.com> wrote:
> Em Fri, 12 Jan 2018 10:18:59 +0100
> Arnd Bergmann <arnd@arndb.de> escreveu:
>
>> On Fri, Jan 12, 2018 at 9:06 AM, Stefan Wahren <stefan.wahren@i2se.com> wrote:
>> > Am 12.01.2018 um 00:32 schrieb Arnd Bergmann:
>> >> On Wed, Jan 10, 2018 at 1:15 PM, Stefan Wahren <stefan.wahren@i2se.com>
>>
>> >> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
>> >> index b4964b067aec..93b55fb71d54 100644
>> >> --- a/drivers/phy/phy-core.c
>> >> +++ b/drivers/phy/phy-core.c
>> >> @@ -410,6 +410,10 @@ static struct phy *_of_phy_get(struct device_node
>> >> *np, int index)
>> >>          if (ret)
>> >>                  return ERR_PTR(-ENODEV);
>> >>
>> >> +       /* This phy type handled by the usb-phy subsystem for now */
>> >> +       if (of_device_is_compatible(np, "usb-nop-xceiv"))
>> >> +               return ERR_PTR(-ENODEV);
>> >> +
>> >>          mutex_lock(&phy_provider_mutex);
>> >>          phy_provider = of_phy_provider_lookup(args.np);
>> >>          if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner))
>> >> {
>> >
>> >
>> > I tried this, but it doesn't work. "np" is the node of the USB controller,
>> > not of the phy?
>>
>> Correct, that was a really dumb mistake on my end, I'm glad I asked
>> you to try it first.
>>
>> I'll fix it up and send the right version with a proper changelog right away.
>
> I suspect you meant to do, instead:
>
>
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index b4964b067aec..584cc1469f7d 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -410,6 +410,10 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
>         if (ret)
>                 return ERR_PTR(-ENODEV);
>
> +       /* This phy type handled by the usb-phy subsystem for now */
> +       if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
> +               return ERR_PTR(-ENODEV);
> +
>         mutex_lock(&phy_provider_mutex);
>         phy_provider = of_phy_provider_lookup(args.np);
>         if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
>
>
> (e. g. args.np, instead of np).
>
> The above works for me on RPi3:
>
> $ uname -a
> Linux raspberrypi 4.15.0-rc7-mcc+ #28 SMP Fri Jan 12 12:35:19 EST 2018 armv7l GNU/Linux
>
> $ lsusb
> Bus 001 Device 005: ID 045e:0750 Microsoft Corp. Wired Keyboard 600
> Bus 001 Device 004: ID 0572:960c Conexant Systems (Rockwell), Inc. DVBSky S960C DVB-S2 tuner
> Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
> Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> So, if you change np -> args.np, feel free to add my:
>
> Tested-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Thanks a lot for testing, args.np is what the version I sent today has after
Stefan pointed out the mistake earlier.

         Arnd
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