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usb: dwc2: drd: fix inconsistent mode if role-switch-default-mode="host"

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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: e14acb8769 ("usb: dwc2: drd: add role-switch-default-node support")
Cc: stable <stable@kernel.org>
Signed-off-by: Ziyang Huang <hzyitc@outlook.com>
Tested-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Reviewed-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/SG2PR01MB204837BF68EDB0E343D2A375C9A59@SG2PR01MB2048.apcprd01.prod.exchangelabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ziyang Huang 2023-02-21 18:30:04 +08:00 committed by Greg Kroah-Hartman
parent 094f391013
commit 82f5332d3b
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/dwc2/drd.c
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@ -35,7 +35,8 @@ static void dwc2_ovr_init(struct dwc2_hsotg *hsotg)
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_force_mode(hsotg, (hsotg->dr_mode == USB_DR_MODE_HOST));
dwc2_force_mode(hsotg, (hsotg->dr_mode == USB_DR_MODE_HOST) ||
(hsotg->role_sw_default_mode == USB_DR_MODE_HOST));
}
static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid)