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SubjectRe: [PATCH v2 07/10] usb: dwc3: Registering a role switch in the DRD code.
From
Date
Hi,

On 2019/2/19 10:57, Jun Li wrote:
>>
>> +static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
>> +{
>> + u32 mode;
>> +
>> + switch (role) {
>> + case USB_ROLE_HOST:
>> + mode = DWC3_GCTL_PRTCAP_HOST;
>> + break;
>> + case USB_ROLE_DEVICE:
>> + mode = DWC3_GCTL_PRTCAP_DEVICE;
>> + break;
>> + default:
>> + mode = DWC3_GCTL_PRTCAP_HOST;
>
> I'd propose let dwc3 stay at device mode at default case.
>
Setting mode to DWC3_GCTL_PRTCAP_HOST at default case due to the
requirement of Hikey960 board. When there is no cable connected to
type-C port, dwc3 should be set to HOST mode and the hub on the
Hikey960 will be power on.
Here is the details of the Hikey960:
https://www.96boards.org/documentation/consumer/hikey/hikey960/hardware-docs/hardware-user-manual.md.html

But I will check the code to see if it is possible to make dwc3
set to device mode at default case.

>> + break;
>> + };
>> +
>> + dwc3_set_mode(dev_get_drvdata(dev), mode);
>> + return 0;
>> +}
>> +
>> +static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
>> +{
>> + struct dwc3 *dwc = dev_get_drvdata(dev);
>> + unsigned long flags;
>> + enum usb_role role;
>> +
>> + spin_lock_irqsave(&dwc->lock, flags);
>> + role = dwc->current_otg_role;
>> + spin_unlock_irqrestore(&dwc->lock, flags);
>> +
>> + return role;
>> +}
>> +
>> int dwc3_drd_init(struct dwc3 *dwc)
>> {
>> + struct usb_role_switch_desc dwc3_role_switch = {0};
>> int ret, irq;
>>
>> dwc->edev = dwc3_get_extcon(dwc);
>> @@ -522,6 +556,15 @@ int dwc3_drd_init(struct dwc3 *dwc)
>> dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
>> }
>>
>> + dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
>> + dwc3_role_switch.set = dwc3_usb_role_switch_set;
>> + dwc3_role_switch.get = dwc3_usb_role_switch_get;
>> + dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
>> + if (ret) {
>> + dwc3_drd_exit(dwc);
>> + return PTR_ERR(dwc->role_sw);
>> + }
>> +
>
> My understanding is, if you use usb role switch, you don't need either edev or
> OTG block event, so this should be like:
>
> if (device_property_read_bool(dwc->dev, "usb-role-switch")) {
> usb role switch register;
> } else if (edev) {
> ...
> } else {
> ...
> }
Yes. Thanks!

>
> Jun
>> return 0;
>> }
>>
>> @@ -557,4 +600,6 @@ void dwc3_drd_exit(struct dwc3 *dwc)
>>
>> if (!dwc->edev)
>> free_irq(dwc->otg_irq, dwc);
>> +
>> + usb_role_switch_unregister(dwc->role_sw);
>> }
>> --
>> 2.15.0-rc2
>>
>
> .
>

Thanks
Yu Chen

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