在 2023/2/21 18:41, Greg KH 写道:
On Tue, Feb 21, 2023 at 06:30:04PM +0800, Ziyang Huang wrote:Some boards might use USB-A female connector for USB ports, however, the port could be connected to a dual-mode USB controller, making it also behaves as a peripheral device if male-to-male cable is connected. In this case, the dts looks like this: &usb0 { status = "okay"; dr_mode = "otg"; usb-role-switch; role-switch-default-mode = "host"; }; After boot, dwc2_ovr_init() sets GOTGCTL to GOTGCTL_AVALOVAL and call dwc2_force_mode() with parameter host=false, which causes inconsistent mode - The hardware is in peripheral mode while the kernel status is in host mode. What we can do now is to call dwc2_drd_role_sw_set() to switch to device mode, and everything should work just fine now, even switching back to none(default) mode afterwards. Fixes: e14acb876985 ("usb: dwc2: drd: add role-switch-default-node support") Signed-off-by: Ziyang Huang <hzyitc@xxxxxxxxxxx> --- Changes since v1 - Use corrent name in Signed-off-byNope, still incorrect, please use your synopsys address. thanks, greg k-h
Oh, I'm not a Synopsys employee but a free developer. This is my first time submitting a kernel patch, please excuse me. Thank you.
