linux-kernel - Re: [PATCHv3 1/2] ARM64: dts: meson-gxbb-odroidc2: Fix usb phy reset warning

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Date:   Tue, 5 Feb 2019 01:34:42 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCHv3 1/2] ARM64: dts: meson-gxbb-odroidc2: Fix usb phy reset warning

Hi Martin,

Thanks for your review comments.

On Mon, 4 Feb 2019 at 19:29, Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> Hi Anand,
>
> On Tue, Jan 29, 2019 at 11:25 AM Anand Moon <linux.amoon@...il.com> wrote:
> >
> > Add missing vin-supply node 5.0V regulator setting to power
> > to usb ports, changes help fix the usb reset warning.
> >
> > [  795.380156] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > [  798.356073] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > [  801.331999] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > [  804.307919] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > [  807.283844] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> >
> > Fixes: 5a0803bd5ae (ARM64: dts: meson-gxbb-odroidc2: Enable USB Nodes)
> > Tested-by: Kevin Hilman <khilman@...libre.com>
> > Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> > Cc: Jerome Brunet <jbrunet@...libre.com>
> > Cc: Neil Armstrong <narmstrong@...libre.com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > changes from prevoius
> >
> >  regulator                      use open bypass  opmode voltage current     min     max
> > ---------------------------------------------------------------------------------------
> >  regulator-dummy                  5    4      0 unknown     0mV     0mA     0mV     0mV
> >     c9100000.usb                  1                                 0mA     0mV     0mV
> >     c9100000.usb                  1                                 0mA     0mV     0mV
> >     c9000000.usb                  1                                 0mA     0mV     0mV
> >     c9000000.usb                  1                                 0mA     0mV     0mV
> >  P5V0                             1    1      0 unknown  5000mV     0mA  5000mV  5000mV
> >     USB_OTG_PWR                   4    2      0 unknown  5000mV     0mA  5000mV  5000mV
> >        phy-c0000020.phy.1         2                                 0mA     0mV     0mV
> >        phy-c0000000.phy.0         2                                 0mA     0mV     0mV
> > --
> > ---
> >  arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> > index 2e1cd5e3a246..da729ed00408 100644
> > --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> > +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> > @@ -28,6 +28,13 @@
> >                 reg = <0x0 0x0 0x0 0x80000000>;
> >         };
> >
> > +       p5v0: regulator-p5v0 {
> > +               compatible = "regulator-fixed";
> > +               regulator-name = "P5V0";
> > +               regulator-min-microvolt = <5000000>;
> > +               regulator-max-microvolt = <5000000>;
> > +       };
> > +
> >         usb_otg_pwr: regulator-usb-pwrs {
> >                 compatible = "regulator-fixed";
> >
> > @@ -36,6 +43,8 @@
> >                 regulator-min-microvolt = <5000000>;
> >                 regulator-max-microvolt = <5000000>;
> >
> > +               vin-supply = <&p5v0>;
> did you find out why this patch fixes the USB_OTG_PWR regulator?
> based on just reading the patch I can't find an explanation myself
>

As per the device tree binding we need this setting to enable power input source
[0] Documentation/devicetree/bindings/regulator/fixed-regulator.txt

*I have observed few more place where this setting is missing*

> have you tested without this patch to rule out that you hit some bug
> in the regulator framework back when you wrote the patch?
> (I don't have an Odroid-C2 so I can't test this myself).
>

Yes I have tested this patch.Some device like usb camera and usb hard drive
when connected to usb port will generate warning message.
which shows us that not enough power is being set to the port.

>
> Regards
> Martin

Best Regards



-Anand