Re: [RFCv1 0/3] Odroid c1+ usb fixs

From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: Anand Moon <linux.amoon@gmail.com>
Cc: devicetree@vger.kernel.org, Kevin Hilman <khilman@baylibre.com>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RFCv1 0/3] Odroid c1+ usb fixs
Date: Mon, 4 Feb 2019 14:51:39 +0100	[thread overview]
Message-ID: <CAFBinCC1xjqogcLm94gu+iLS_b_zB8eNEXL+4bYhog==zN0S+A@mail.gmail.com> (raw)
In-Reply-To: <20190123151209.2080-1-linux.amoon@gmail.com>

Hi Anand,

On Wed, Jan 23, 2019 at 4:12 PM Anand Moon <linux.amoon@gmail.com> wrote:
>
> This is follow up on my previous patches.
>
> [0] https://lore.kernel.org/patchwork/patch/1031616/
> [1] https://lore.kernel.org/patchwork/patch/1031617/
>
> As per Martin's suggestion and input I have tried to fix below issue.
>
> Fixed the phy power issue on the usb port.
> # cat /sys/kernel/debug/regulator/regulator_summary
>     USB_VBUS                      4    2      0 unknown  5000mV     0mA  5000mV  5000mV
>        phy-c1108820.phy.1         2                                 0mA     0mV     0mV
>        phy-c1108800.phy.0         2                                 0mA     0mV     0mV
>
> Fixed the OTG phy warning and initilizaion of usb0_phy
> # 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 5, If 0, Class=Mass Storage, Driver=usb-storage, 480M
>         |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
>         |__ Port 3: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
>         |__ Port 3: Dev 4, If 2, Class=Audio, Driver=snd-usb-audio, 480M
>         |__ Port 3: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
>         |__ Port 3: Dev 4, If 3, Class=Audio, Driver=snd-usb-audio, 480M
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
>
> Now hotpluing of usb device is working on odroid c1+ boards.
unfortunately it's still not working for me :(

all following descriptions are seen when looking at the PCB with the
40-pin connector on the bottom, USB ports on the left, micro USB
connector on the top right.

my test-case is:
- power-cycle the board
- enter u-boot command prompt
- gset GPIOAO_5 out high (or replace high with low)
- measure

I checked the voltage at RT9715EGB (U19) with a volt meter:
GPIOAO_5 HIGH:
- EN pin (bottom, left): 3.3V
- VOUT pin (top right): 5V
GPIOAO_5 LOW:
- EN pin (bottom, left). 0V
- VOUT pin (top right): 5V (not sure why...)

I also checked the voltage at Q5 2N7002W with a volt meter:
- gate (bottom, right): 0V
- source (top, right): 3.3V
- drain (left): 0V
this is always the same, regardless of whether GPIOAO_5 is HIGH or LOW.
however, with Armbian booted (which uses some Amlogic 3.10 kernel
where USB works) I get:
- gate (bottom, right): 0V
- source (top, right): 0V
- drain (left): 3.3V

what do you get on your board?

Regards
Martin