USB reset in suspended state

[Qbicz]

Describe the bug
On startup, USB stack sends suspend and resume between CONNECTED and CONFIGURED states.

But sometimes USB stack will send RESET callback in between:

USB_DC_SUSPEND
USB_DC_RESET
USB_DC_RESUME

And we get RESUME when we are not suspended. Checked with @pawelzadrozniak - reset should not occur between suspend and resume.

To Reproduce
Using USB HID class. This sequence occurs right after boot, when boot is done with USB connected.

Environment (please complete the following information):

• nRF52840
• Zephyr 19de7ec

CONFIG_USB=y
CONFIG_USB_NRF52840=y
CONFIG_USB_DEVICE_STACK=y
CONFIG_USB_DEVICE_HID=y
CONFIG_USB_DEVICE_LOG_LEVEL_OFF=y
CONFIG_USB_DRIVER_LOG_LEVEL_OFF=y
CONFIG_USB_HID_POLL_INTERVAL_MS=1
CONFIG_USB_HID_BOOT_PROTOCOL=y
CONFIG_USB_HID_PROTOCOL_CODE=2

[Qbicz]

Full sequence of USB state changes I get is the same as in #14627

[carlescufi]

@pawelzadrozniak will you be able to send a fix for this?

[pawelzadrozniak]

@pawelzadrozniak will you be able to send a fix for this?

That's something we have discussed earlier today.
I'll investigate next week what is causing the wrong event order.

[Qbicz]

@pawelzadrozniak This issue no longer occurs on 06ab394 (v1.14.0)

The sequence after plugging a cable is now

[04038208] <wrn> usb_state: USB connected
[04038310] <wrn> usb_state: USB suspend
[04042041] <wrn> usb_state: USB resume
[04042043] <wrn> usb_state: USB reset
[04045122] <wrn> usb_state: USB reset
[04050510] <wrn> usb_state: USB configured

There is no reset is suspended state.