I am trying to initialize a dwc2 usb otg host using the u-boot dwc2 driver in u-boot and barebox and am trying to get past the port power-up step. The controller is activated successfully once the Linux kernel boots up and the mass storage devices are accessible, but in u-boot and barebox it seems to not receive the
USB_PORT_STAT_C_CONNECTION nor the USB_PORT_STAT_C_ENABLE
port change status. In the bootloader, usb_get_port_status returns 0x510 (i.e. HIGH_SPEED | POWER | RESET), while under linux the status after powering up the port is 0x101 (i.e. POWER | CONNECTION) and the linux usb core then properly brings up the port.
I looked at the submitted usb requests, and didn't see any relevant difference (bootloader vs linux). All I could see from the debug output is that PwrOn2PwrGood time and HubContrCurrent are both zero in barebox and nonzero in linux.
Could the cause be the fact that in the bootloader the port comes up with HIGH_SPEED status ? Can I disable this flag during hub initialization ? Or is there another probable cause for this ?
Regards, Bogdan