It is necessary that:
ROLE_SWITCH && device_property_read_bool(dwc->dev, "usb-role-switch")
is true in order for dwc3_get_dr_mode() to _not_ force us from OTG to
PERIPHERAL mode here:
if (mode == USB_DR_MODE_OTG &&
(!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) ||
!device_property_read_bool(dwc->dev, "usb-role-switch")) &&
!DWC3_VER_IS_PRIOR(DWC3, 330A))
mode = USB_DR_MODE_PERIPHERAL;
and dwc3_drd_init() to be called later in dwc3_core_init_mode(). So,
to avoid always ignoring extcon device returned by dwc3_get_extcon()
change dwc3_drd_init() to check and use it first, before checking if
dwc3_setup_role_switch() should be called.
Cc: Felipe Balbi <balbi@xxxxxxxxxx>
Cc: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
Hopefully I didn't miss something important making this patch
unnecessary. Don't know if this is a good solution or not, part of me
thinks than maybe changing the aforementioned code in
dwc3_get_dr_mode() to account for extcon wopuld be
simpler/better. Happy to rework this.
drivers/usb/dwc3/drd.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index e2b68bb770d1..835bd0be87d5 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -579,12 +579,7 @@ int dwc3_drd_init(struct dwc3 *dwc)
if (IS_ERR(dwc->edev))
return PTR_ERR(dwc->edev);
- if (ROLE_SWITCH &&
- device_property_read_bool(dwc->dev, "usb-role-switch")) {
- ret = dwc3_setup_role_switch(dwc);
- if (ret < 0)
- return ret;
- } else if (dwc->edev) {
+ if (dwc->edev) {
dwc->edev_nb.notifier_call = dwc3_drd_notifier;
ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
@@ -594,6 +589,11 @@ int dwc3_drd_init(struct dwc3 *dwc)
}
dwc3_drd_update(dwc);
+ } else if (ROLE_SWITCH &&
+ device_property_read_bool(dwc->dev, "usb-role-switch")) {
+ ret = dwc3_setup_role_switch(dwc);
+ if (ret < 0)
+ return ret;
} else {
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
dwc->current_dr_role = DWC3_GCTL_PRTCAP_OTG;
--
2.25.1
