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References: <20191028215919.83697-1-john.stultz@linaro.org>
 <20191028215919.83697-3-john.stultz@linaro.org> <87pnifj4tg.fsf@gmail.com>
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From:   John Stultz <john.stultz@linaro.org>
Date:   Tue, 29 Oct 2019 14:21:31 -0700
Message-ID: <CALAqxLW4bRKOUchQXM0WKy-SWT7GQrA+6acu_1QMjEwwxCaU0w@mail.gmail.com>
Subject: Re: [PATCH v4 2/9] usb: dwc3: Execute GCTL Core Soft Reset while
 switch modes
To:     Felipe Balbi <balbi@kernel.org>
Cc:     lkml <linux-kernel@vger.kernel.org>, Yu Chen <chenyu56@huawei.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        ShuFan Lee <shufan_lee@richtek.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Jun Li <lijun.kernel@gmail.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Jack Pham <jackp@codeaurora.org>,
        Linux USB List <linux-usb@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>
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On Tue, Oct 29, 2019 at 2:09 AM Felipe Balbi <balbi@kernel.org> wrote:
> John Stultz <john.stultz@linaro.org> writes:
> > From: Yu Chen <chenyu56@huawei.com>
> >
> > On the HiKey960, we need to do a GCTL soft reset when
> > switching modes.
> >
> > Jack Pham also noted that in the Synopsys databook it
> > mentions performing a GCTL CoreSoftReset when changing the
> > PrtCapDir between device & host modes.
> >
> > So this patch always does a GCTL Core Soft Reset when
> > changing the mode.
> >
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: Rob Herring <robh+dt@kernel.org>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > CC: ShuFan Lee <shufan_lee@richtek.com>
> > Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> > Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > Cc: Yu Chen <chenyu56@huawei.com>
> > Cc: Felipe Balbi <balbi@kernel.org>
> > Cc: Hans de Goede <hdegoede@redhat.com>
> > Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> > Cc: Jun Li <lijun.kernel@gmail.com>
> > Cc: Valentin Schneider <valentin.schneider@arm.com>
> > Cc: Jack Pham <jackp@codeaurora.org>
> > Cc: linux-usb@vger.kernel.org
> > Cc: devicetree@vger.kernel.org
> > Signed-off-by: Yu Chen <chenyu56@huawei.com>
> > Signed-off-by: John Stultz <john.stultz@linaro.org>
> > ---
> > v3: Remove quirk conditional, as Jack Pham noted the
> >     Synopsis databook states this should be done generally.
> >     Also, at Jacks' suggestion, make the reset call before
> >     changing the prtcap direction.
> > ---
> >  drivers/usb/dwc3/core.c | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index 999ce5e84d3c..a039e35ec7ad 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -112,6 +112,19 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
> >       dwc->current_dr_role = mode;
> >  }
> >
> > +static void dwc3_gctl_core_soft_reset(struct dwc3 *dwc)
> > +{
> > +     u32 reg;
> > +
> > +     reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > +     reg |= DWC3_GCTL_CORESOFTRESET;
> > +     dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > +
> > +     reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > +     reg &= ~DWC3_GCTL_CORESOFTRESET;
> > +     dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > +}
> > +
> >  static void __dwc3_set_mode(struct work_struct *work)
> >  {
> >       struct dwc3 *dwc = work_to_dwc(work);
> > @@ -154,6 +167,9 @@ static void __dwc3_set_mode(struct work_struct *work)
> >
> >       spin_lock_irqsave(&dwc->lock, flags);
> >
> > +     /* Execute a GCTL Core Soft Reset when switch mode */
> > +     dwc3_gctl_core_soft_reset(dwc);
> > +
>
> This is totally unnecessary. We have several platforms supporting dual
> role *without* this trick. The only reason why the databook mentions a
> reset is because some registers are shadowed, meaning that they share
> the same physical space and just appear as different things for SW. The
> reason being that Synopsys wanted to reduce the area of the IP and
> decided to shadow registers which are mutually exclusive.

Ok. I've dropped this for now. Without this I do see an occasional
issues seemingly more frequently where he board seems to initialize
improperly on boot (usb-c is connected, but it doesn't seem to detect
until I unplug and replug), but it also trips (though seemingly less
frequently) without this, so this may be just affecting the timing of
a initialization race issue. I'll watch this for more info and follow
up on it later.

Thanks for the review!
-john