Date:   Mon, 21 Jan 2019 12:07:33 +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>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Emiliano Ingrassia <ingrassia@...genesys.com>
Subject: Re: [PATCH 1/2] ARM: dts: meson8b: odroidc1: Enable usb phy node

Hi Martin,

Thanks for you comments.

On Mon, 21 Jan 2019 at 03:21, Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> Hi Anand,
>
> On Sun, Jan 20, 2019 at 7:44 PM Anand Moon <linux.amoon@...il.com> wrote:
> >
> > Hi Martin,
> >
> > Thanks for your review comments.
> >
> > On Sat, 19 Jan 2019 at 03:59, Martin Blumenstingl
> > <martin.blumenstingl@...glemail.com> wrote:
> > >
> > > Hi Anand,
> > >
> > > thank you for this patch!
> > >
> > > On Sun, Jan 13, 2019 at 7:18 PM Anand Moon <linux.amoon@...il.com> wrote:
> > > >
> > > > Add missing vbus-supply link to phy controller for usb_phy0
> > > > and usb_phy1 nodes, this changes fixed the power issue
> > > > on usb ports usb, changes help fix usb reset warning.
> > > I trust you on the fact that GPIOAO_5 controls VBUS of USB0 and USB1
> > >
> > > to me the schematics are not 100% clear or I'm bad at interpreting them:
> > > - I'll refer to odroid-c1+_rev0.4_20150615.pdf
> > > - page 1 lists GPIOAO.BIT5 as input for the PWREN signal of the
> > > USB_OTG controller (usb0)
> > > - page 1 also shows a PWREN signal in the USB_HOST controller (usb1)
> > > but not it's input
> > > - based on your patch I assume that PWREN is the same signal for both
> > > USB controllers
> > >
> > As per the schematics odroid-c1+_rev0.4_20150615.pdf
> >
> > It seem that their  vbus setting for *OTG* port. *Bus 01.Port 1* using
> > *GPIOAO.BIT5* gpio
> that matches my interpretation of the schematics

Yep, I feel that GPIOAO.BIT5 enable the PWREN power on  Bus 02.Port (usb1)
But I could not get this to enable on Bus 01.Port (usb0).

usb hot-plug of devices is working fine on *usb1* but not on *usb0*.
I have tried different combination but it's not working for me.

I am attaching small changes to phy which enables the Bus 01.Port
(usb0) on Odroid C1+/Odroidc2.
we need to set dr_mode="otg" to enable this bus in dts.

>
> > But we also need set power supply for *USB_B* port. *Bus 02.Port 1* ?
> > I don't know but I will try to find solution.
> I assume we also have to enable VBUS for the host only port, but I
> don't know how
>
> > We need to enable some bit in phy driver ?
> I'm not aware of any bit in the PHY driver which can toggle VBUS
>
> (trying to be creative here) maybe the GPIO is incorrectly configured
> to pull up or down?

I have tried this but no luck.

> if you want me to compare anything: there's some Armbian image (where
> the USB host ports are working fine) on the eMMC of my Odroid-C1 so I
> can get you the values you're looking for
>
> > > > [  821.991470] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > > > [  825.243385] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > > > [  828.151310] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > > > [  830.991241] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> > > >
> > > > Fixes: 2eb79a4d15ff (ARM: dts: meson: enabling the USB Host controller on Odroid-C1/C1+ board)
> > > you already split your original patch into two, however I suggest
> > > splitting these patches differently:
> > > - this one (personally I would choose "ARM: dts: meson8b: odroidc1:
> > > fix USB VBUS supplies" as title), which contains the Fixes tag, adds
> > > the "usb_vbus" and references it in the "usb0" and "usb1" nodes
> > > - enables usb0_phy and usb0 as part of your second patch (I would call
> > > that "ARM: dts: meson8b: odroidc1: enable the OTG capable USB
> > > controller")
> >
> > Ok I will fix this as per you suggestion in the next version.
> >
> > >
> > > > 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>
> > > > ---
> > > > Rebased on Kevin's amlogic/v5.0/fixes branch
> > > >
> > > > [alarm@...hl-c1t ~]$ lsusb -t
> > > > /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
> > > >     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
> > > >         |__ Port 1: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
> > > >         |__ Port 3: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
> > > >         |__ Port 3: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
> > > >         |__ Port 3: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 480M
> > > >         |__ Port 3: Dev 3, If 3, Class=Audio, Driver=snd-usb-audio, 480M
> > > > [alarm@...hl-c1t ~]$
> > > > [alarm@...hl-c1t ~]$ lsusb -v|egrep "^Bus|MaxPower"
> > > > Couldn't open device, some information will be missing
> > > > Bus 001 Device 003: ID 1b71:0056 Fushicai
> > > >     MaxPower              500mA
> > > > Couldn't open device, some information will be missing
> > > > Bus 001 Device 004: ID 152d:0578 JMicron Technology Corp. / JMicron USA Technology Corp. JMS567 SATA 6Gb/s bridge
> > > >     MaxPower               30mA
> > > > Couldn't open device, some information will be missing
> > > > Couldn't open device, some information will be missing
> > > > Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
> > > >     MaxPower              100mA
> > > > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > > >     MaxPower                0mA
> > > > ---
> > > >  arch/arm/boot/dts/meson8b-odroidc1.dts | 23 +++++++++++++++++++++++
> > > >  1 file changed, 23 insertions(+)
> > > >
> > > > diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
> > > > index 0f0a46ddf3ff..a49a8509b288 100644
> > > > --- a/arch/arm/boot/dts/meson8b-odroidc1.dts
> > > > +++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
> > > > @@ -83,6 +83,19 @@
> > > >                 regulator-max-microvolt = <5000000>;
> > > >         };
> > > >
> > > > +       usb_vbus: regulator-usb-vbus {
> > > please add a comment here with some details about the regulator and
> > > add a hint that the signal in the schematics is called "PWREN"
> > Ok I will add this comment in the next patch.
> > >
> > > > +               compatible = "regulator-fixed";
> > > > +
> > > > +               regulator-name = "USB_VBUS";
> > > > +               regulator-min-microvolt = <5000000>;
> > > > +               regulator-max-microvolt = <5000000>;
> > > > +
> > > > +               vin-supply = <&p5v0>;
> > > > +
> > > > +               gpio = <&gpio_ao GPIOAO_5 GPIO_ACTIVE_HIGH>;
> > > > +               enable-active-high;
> > > > +       };
> > > > +
> > > >         tflash_vdd: regulator-tflash_vdd {
> > > >                 /*
> > > >                  * signal name from schematics: TFLASH_VDD_EN
> > > > @@ -293,8 +306,18 @@
> > > >         pinctrl-names = "default";
> > > >  };
> > > >
> > > > +&usb0_phy {
> > > > +       status = "okay";
> > > > +       vbus-supply = <&usb_vbus>;
> > > > +};
> > > > +
> > > >  &usb1_phy {
> > > >         status = "okay";
> > > > +       vbus-supply = <&usb_vbus>;
> > > > +};
> > > > +
> > > > +&usb0 {
> > > > +       status = "okay";
> > > >  };
> > > I believe there's a problem with the usb/usb_phy nodes here. on my
> > > Odroid-C1 this results in:
> > > # cat /sys/kernel/debug/regulator/regulator_summary | grep USB_VBUS
> > >    USB_VBUS                      0    0      0 unknown  5000mV     0mA
> > >  5000mV  5000mV
> > > (open count is 0)
> > >
> > > if I move "vbus-supply" to the "usb1" node (just as an example) then I get:
> > > # cat /sys/kernel/debug/regulator/regulator_summary | grep USB_VBUS
> > >    USB_VBUS                      1    1      0 unknown  5000mV     0mA
> > >  5000mV  5000mV
> >
> > Sorry for the mixing the vbus-supply node.
> >
> > After fix the phy driver code and dts changes I am getting this changes.
> > # cat /sys/kernel/debug/regulator/regulator_summary | grep USB_VBUS
> >     USB_VBUS                      1    2      0 unknown  5000mV
> > 0mA  5000mV  5000mV
> >
> > Now I am able to enable both *Bus 01.Port 1* and *Bus 02.Port 1*
> >
> > # lsusb -t
> > /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
> >     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
> >         |__ Port 1: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
> >         |__ Port 3: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
> >         |__ Port 3: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
> >         |__ Port 3: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 480M
> >         |__ Port 3: Dev 3, If 3, Class=Audio, Driver=snd-usb-audio, 480M
> so this is the host-only controller (usb1) and it's working fine for
> you - very nice!
>
> > /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
> >
> > But not usb device are getting enable on *Bus 01.Port 1*
> so you have something plugged into the OTG capable controller (usb0)
> using an OTG cable?

Yes I have connected USB-OTG cable with storage device attached,
led lights on the device is blinking, but no power to the port is enable.
so not hotplug of device is working on this port.

> I've not tried this before on my Odroid-C1 because I'm using the micro
> USB connector to power the board

Correct me if I am wrong, we need to tune USB phy driver to enable as
power the board ?

>
> do you get VBUS (maybe you have a USB thumb drive with an LED which
> lights up when you connect it)?
> do you get any errors or warnings from the dwc2 driver during boot?
>

Please find the boot log of my Odroid C1+ here
[0]: https://pastebin.com/PiDmVmEC

I dont see any major error on usb side.

> > >
> > > unfortunately neither your original patch nor the modified version
> > > seem to enable USB VBUS on my Odroid-C1.
> > > I have documented my findings already back in December, see "USB
> > > issues on Odroid-C1" [0]
> > > help on that would be highly appreciated :)
> > >
> > > on which board revision have you tested this patch?
> > >
> >
> > I have with me for testing
> >
> > ODROID-C0 REV 0.4 20151217
> > ODROID-C1+ REV 0.4 20150615 ----> current testing on
> I have the exact same Odroid-C1+ board revision
> this is my u-boot version:
> U-boot-00000-gb7b8dc2-dirty(odroidc@...8dc21) (Sep 01 2017 - 01:18:22)
> -> b7b8dc21 is the lastest commit of the hardkernel odroidc-v2011.03
> u-boot branch at the time of writing
>

I am using the the u-boot from archlinux.
If their is another u-boot for Odroid c1 plz let me know, I will try
to install this on my system.

Thanks for your input.

>
> Regards
> Martin

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