How to make USB_FS work ???

[MBell.5]

hi, i'm trying to make USB_FS work on my custom board.

my desired configuration is peripheral (otg can be ok, i have jumper on id: PA_10)

i already have 2 USB HS so i can use only USB_FS mapped on PA_11 and PA_12 as OTG.

i follow the st wiki at the point 3.3.1 witn dr_mode = "peripheral";

my result is:

i can see 49000000.usb-otg under /sys/class/udc/

i can create one gadget device in /sys/kernel/config/usb_gadget/g1 (i created serial over usb)

as i assign 49000000.usb-otg > /sys/kernel/config/usb_gadget/g1/UDC, usb does not turn on, i always have 0V on PA_11 and PA_12

if i follow the st wiki at the point 3.3.2 witn dr_mode = "peripheral";

all works great and i can create my usb gadget

more info:

my micro is STM32MP157F

i'm using linux 5.10.10

i have NO hardware pull_up or pull_down on any line

i have VDD3V3_USBFS shorted with VDD3V3_USBHS (both connected to 3.3v)

my otg port is B_TYPE and i have one jumper to select OTG mode (i need only peripheral)

can anyone help me?

[ZUl A.1]

Yes, please, I can test it and let you know too.

[MBell.5]

Here it is the patch.

let me know !!!

[ZUl A.1]

Have these patches solved the SOFT reset issue for you or not?

[MBell.5]

i abandoned dunfell.

as i switched to kirkstone i have the problem without the SOFT reset.

the usb just does not work. seems that one clock was missing.

with this patch all work on my side (kirkstone)

[ZUl A.1]

so the USB is working in peripheral mode without any problem with these patches or does these patches only solved the SOFT reset problem for you?

[MBell.5]

all work good on my side. i create an USB device and it work good.

my device is "serial over usb".

and i'm able to send message from PC to ST and from ST to PC.

[Kevin HUBER · Accepted solution]

Hello @MBell.5​ ,

Thanks for sharing the patches with the community.

As explained previously, these patches are temporary and a final version of them will be included in a next official release.

These patches add the support for the utmi clock and allow to be sure that the utmi-clock is enabled when the OTG FS need it. This is needed on stm32mp15, when using the integrated full-speed PHY.

This prevent to have the timeout :

dwc2 49000000.usb-otg: dwc2_core_reset: HANG! Soft Reset timeout GRSTCTL_CSFTRST

Best Regards,

Kevin

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[ZUl A.1]

Thank you so much for these patches; they have worked. They have probably saved me a week of research.

[MBell.5]

you're welcome !!! :penguin: