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Pi4, USB-C Port #266

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ganzgustav22 opened this issue Sep 9, 2020 · 5 comments
Closed

Pi4, USB-C Port #266

ganzgustav22 opened this issue Sep 9, 2020 · 5 comments

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@ganzgustav22
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ganzgustav22 commented Sep 9, 2020 •
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Will (or should) this tool cut and restore power on the Pi4 USB-C Port also?

According to https://github.com/mvp/uhubctl#raspberry-pi-4b
uhubctl -l 3 -p 1 -a 0
should cut power. When I type this, I can see the device disappear in dmesg:

[  184.239568] dwc2 fe980000.usb: Not connected
[  184.239593] usb 3-1: usbfs: usb_submit_urb returned -19
[  184.239637] dwc2 fe980000.usb: Not connected
[  184.239652] usb 3-1: usbfs: usb_submit_urb returned -19
[  184.315865] usb 3-1: USB disconnect, device number 2

When running uhubctl -l 3 -p 1 -a 1 it doesn't come back though.

Edit, sorry forgot to add:

Using Raspberry Pi OS 2020-05-27:

Linux 4.19.118-v7l+ #1311 SMP Mon Apr 27 14:26:42 BST 2020 armv7l GNU/Linux

BCM2711 detected
BOOTLOADER: up-to-date
CURRENT: Thu 16 Apr 17:11:26 UTC 2020 (1587057086)
 LATEST: Thu 16 Apr 17:11:26 UTC 2020 (1587057086)
 FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: up-to-date
CURRENT: 000137ad
 LATEST: 000137ad
@ganzgustav22
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Well, I've measured with a multimeter on TP1 now (I think this is the testpad that is connected to the USB +5V line?), but the power doesn't get cut off. Also I can measure 0 Ohm between TP1 and the +5V line on the GPIO header, that means it's parallel and the power cannot be controlled via software, or?

@mvp
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mvp commented Sep 9, 2020

uhubctl can see this device advertising power switching support, and is able to send a request to turn power off.

However, it seems that underlying chip is missing necessary circuitry to actually cut the power on otg line.

I don't know internal details of pi4 otg chip, perhaps @P33M or @SlySven know more about pi4 hardware and can shed some light?

@P33M
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P33M commented Sep 9, 2020

There is no power switching facility on Pi 4's USB-C port.

@mvp
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mvp commented Sep 9, 2020

Thanks @P33M for confirmation. I will change readme to mention that

@mvp mvp closed this as completed Sep 9, 2020
@ganzgustav22
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Thanks for your quick help guys.

mvp added a commit that referenced this issue Sep 9, 2020
@mvp
Clarify RPi4B support for USB-C OTG port
3bc22e3 
Closes #266.
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@mvp @P33M @ganzgustav22