linux-kernel - Re: [PATCH] usb: dwc3: qcom: enable vbus override when in OTG dr-mode

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Message-ID: <9fdeecf9-8723-5305-ae68-f525c7115456@linaro.org>
Date:   Mon, 23 Jan 2023 11:20:12 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: qcom: enable vbus override when in OTG dr-mode

On 23/01/2023 09:01, Neil Armstrong wrote:
> With vbus override enabled when in OTG dr_mode, Host<->Peripheral
> switch now works on SM8550, otherwise the DWC3 seems to be stuck
> in Host mode only.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   drivers/usb/dwc3/dwc3-qcom.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index b0a0351d2d8b..959fc925ca7c 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -901,7 +901,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>   	qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
>   
>   	/* enable vbus override for device mode */
> -	if (qcom->mode == USB_DR_MODE_PERIPHERAL)
> +	if (qcom->mode != USB_DR_MODE_HOST)
>   		dwc3_qcom_vbus_override_enable(qcom, true);
>   
>   	/* register extcon to override sw_vbus on Vbus change later */
> 
> ---
> base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2
> change-id: 20230123-topic-sm8550-upstream-dwc3-qcom-otg-81795ea148db
> 
> Best regards,

This makes logical sense => only over-ride VBUS when !Host

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>