Re: [PATCH v4 7/7] usb: dwc3: qcom: Enable VBUS override at probe for default peripheral role

[Peter Chen]

On 26-10-29 00:29:37, Faisal Hassan wrote:
> When the controller is in OTG mode with usb-role-switch and
> role-switch-default-mode set to peripheral, the role notifier never sees
> a transition at probe, so the QSCRATCH VBUS override is not programmed
> and the device never gets a session-valid indication.
> 
> Enable the VBUS override at probe whenever the initial role is
> USB_ROLE_DEVICE.
> 
> Validated on SA8255P with an HS host attached: 20 unbind/bind and 20
> suspend/resume iterations completed with no failures.
> 
> Signed-off-by: Faisal Hassan <faisal.hassan@xxxxxxxxxxxxxxxx>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 0896a323bdda..92f1223f7b21 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -953,10 +953,12 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  		dwc3_qcom_vbus_override_enable(qcom, true);

....

>  	} else {
>  		if ((device_property_read_bool(dev, "usb-role-switch")) &&
> -		    (usb_get_role_switch_default_mode(dev) == USB_DR_MODE_HOST))
> +		    (usb_get_role_switch_default_mode(dev) == USB_DR_MODE_HOST)) {
>  			qcom->current_role = USB_ROLE_HOST;
> -		else
> +		} else {
>  			qcom->current_role = USB_ROLE_DEVICE;
> +			dwc3_qcom_vbus_override_enable(qcom, true);
> +		}

How about move it and above [....] under device role, let above code purely determine current_role:
	if (qcom->current_role == USB_ROLE_DEVICE)
		dwc3_qcom_vbus_override_enable(qcom, true);

Peter

-- 

Thanks,
Peter Chen