imx8mm USB Mass Storage fails through a HUB

[Marek Vasut]

On 2/9/23 20:58, Tim Harvey wrote:
> Greetings,

Hi,

> I'm finding that USB Mass Storage devices appear to fail detection on
> imx8mm when hanging off a USB hub whereas other devices such as USB
> ethernet work fine.
> 
> u-boot=> usb start && usb tree
> starting USB...
> Bus usb at 32e40000: Bus usb at 32e50000: USB EHCI 1.00
> scanning bus usb at 32e40000 for devices... 1 USB Device(s) found
> scanning bus usb at 32e50000 for devices... cannot reset port 3!?
> 3 USB Device(s) found
>         scanning usb for storage devices... 0 Storage Device(s) found
> USB device tree:
>    1  Hub (480 Mb/s, 0mA)
>       u-boot EHCI Host Controller
> 
>    1  Hub (480 Mb/s, 0mA)
>    |  u-boot EHCI Host Controller
>    |
>    +-2  Hub (480 Mb/s, 0mA)
>      |  Microchip Tech USB2744
>      |
>      +-3  Vendor specific (480 Mb/s, 0mA)
>           Microchip Tech Hub Controller
> 
> Depending on the board and port sometimes I see the 'cannot reset
> port' issue calling out the port of the hub and sometimes I see a
> 'EHCI timed out on TD - token=0x80008c80 unable to get device
> descriptor (error=-1)' error.
> 
> I have several imx8m{m,n,p}-venice boards with onboard hubs I noticed
> this with but you can re-create this on an imx8mm-evk if you attach a
> HUB with a USB Mass Storage Device to the front-panel USB Type-C
> connector after manually enabling VBUS (due to the lack of a PTN5110
> driver that would handle source/sink detection on that port):
> i2c dev 1 && i2c mw 0x50 0x23 0x77 1 # COMMAND: SRC_VBUS_HIGH
> usb start && usb tree
> 
> So far I've tried without success:
> - setenv usb_pgood_delay 5000
> - CONFIG_USB_ONBOARD_HUB=y
> 
> Any ideas on this?

Does this happen with one specific USB storage device , or any arbitrary 
device ? Try a device from another vendor for example.