Re: [PATCH v5 5/5] usb: dwc3: qcom: Modify interrupt handling for eUSB2 Phy targets

On Thu, Jul 23, 2026, Krishna Kurapati wrote:
> eUSB2 targets handle wakeup interrupts differently depending on device
> speed when operating in host mode.
> 
> According to the eUSB2 specification, remote wakeup signaling in host
> mode is detected via different data-line assertions based on the
> connected device speed.
> 
> When a low-speed device is connected, the host repeater drives eD+ to
> logic '1' upon detecting a K-state on the USB lines during remote wakeup
> (eUSB2 specification, Section 5.5.14).
> 
> When a full-speed or high-speed device is connected, the host repeater
> drives eD- to logic '1' upon detecting a K-state on the USB line during
> remote wakeup (eUSB2 specification, Sections 5.5.15 and 5.5.18).
> 
> Since the eUSB2 PHY's "DP" and "DM" interrupt lines monitor the eD+ and
> eD- line states, query the phy type and configure the wakeup interrupts
> accordingly.
> 
> Signed-off-by: Krishna Kurapati <[email protected]>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 53 +++++++++++++++++++++++++++++++++++---------
>  1 file changed, 43 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index f43f73ac36ff..4c559b97c627 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -85,6 +85,7 @@ struct dwc3_qcom {
>  	struct icc_path		*icc_path_apps;
>  
>  	enum usb_role		current_role;
> +	bool			has_eusb2_phy;
>  };
>  
>  #define to_dwc3_qcom(d) container_of((d), struct dwc3_qcom, dwc)
> @@ -272,15 +273,23 @@ static void dwc3_qcom_disable_wakeup_irq(int irq)
>  	disable_irq_nosync(irq);
>  }
>  
> -static void dwc3_qcom_disable_port_interrupts(struct dwc3_qcom_port *port)
> +static void dwc3_qcom_disable_port_interrupts(struct dwc3_qcom *qcom, int port_index)
>  {
> +	struct dwc3_qcom_port *port = &qcom->ports[port_index];
> +
>  	dwc3_qcom_disable_wakeup_irq(port->qusb2_phy_irq);
>  
>  	if (port->usb2_speed == USB_SPEED_LOW) {
> -		dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
> +		if (qcom->has_eusb2_phy)
> +			dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
> +		else
> +			dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
>  	} else if ((port->usb2_speed == USB_SPEED_HIGH) ||
>  			(port->usb2_speed == USB_SPEED_FULL)) {
> -		dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
> +		if (qcom->has_eusb2_phy)
> +			dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
> +		else
> +			dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
>  	} else {
>  		dwc3_qcom_disable_wakeup_irq(port->dp_hs_phy_irq);
>  		dwc3_qcom_disable_wakeup_irq(port->dm_hs_phy_irq);
> @@ -289,8 +298,10 @@ static void dwc3_qcom_disable_port_interrupts(struct dwc3_qcom_port *port)
>  	dwc3_qcom_disable_wakeup_irq(port->ss_phy_irq);
>  }
>  
> -static void dwc3_qcom_enable_port_interrupts(struct dwc3_qcom_port *port)
> +static void dwc3_qcom_enable_port_interrupts(struct dwc3_qcom *qcom, int port_index)
>  {
> +	struct dwc3_qcom_port *port = &qcom->ports[port_index];
> +
>  	dwc3_qcom_enable_wakeup_irq(port->qusb2_phy_irq, 0);
>  
>  	/*
> @@ -303,12 +314,20 @@ static void dwc3_qcom_enable_port_interrupts(struct dwc3_qcom_port *port)
>  	 */
>  
>  	if (port->usb2_speed == USB_SPEED_LOW) {
> -		dwc3_qcom_enable_wakeup_irq(port->dm_hs_phy_irq,
> -					    IRQ_TYPE_EDGE_FALLING);
> +		if (qcom->has_eusb2_phy)
> +			dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
> +						    IRQ_TYPE_EDGE_RISING);
> +		else
> +			dwc3_qcom_enable_wakeup_irq(port->dm_hs_phy_irq,
> +						    IRQ_TYPE_EDGE_FALLING);
>  	} else if ((port->usb2_speed == USB_SPEED_HIGH) ||
>  			(port->usb2_speed == USB_SPEED_FULL)) {
> -		dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
> -					    IRQ_TYPE_EDGE_FALLING);
> +		if (qcom->has_eusb2_phy)
> +			dwc3_qcom_enable_wakeup_irq(port->dm_hs_phy_irq,
> +						    IRQ_TYPE_EDGE_RISING);
> +		else
> +			dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
> +						    IRQ_TYPE_EDGE_FALLING);
>  	} else {
>  		dwc3_qcom_enable_wakeup_irq(port->dp_hs_phy_irq,
>  					    IRQ_TYPE_EDGE_RISING);
> @@ -324,7 +343,7 @@ static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
>  	int i;
>  
>  	for (i = 0; i < qcom->num_ports; i++)
> -		dwc3_qcom_disable_port_interrupts(&qcom->ports[i]);
> +		dwc3_qcom_disable_port_interrupts(qcom, i);
>  }
>  
>  static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
> @@ -332,7 +351,7 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
>  	int i;
>  
>  	for (i = 0; i < qcom->num_ports; i++)
> -		dwc3_qcom_enable_port_interrupts(&qcom->ports[i]);
> +		dwc3_qcom_enable_port_interrupts(qcom, i);
>  }
>  
>  static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
> @@ -617,6 +636,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	int			ret;
>  	bool			ignore_pipe_clk;
>  	bool			wakeup_source;
> +	struct phy		*phy;
>  
>  	qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
>  	if (!qcom)
> @@ -683,6 +703,19 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	if (ignore_pipe_clk)
>  		dwc3_qcom_select_utmi_clk(qcom);
>  
> +	if (qcom->num_ports == 1)
> +		phy = devm_phy_get(dev, "usb2-phy");
> +	else
> +		phy = devm_phy_get(dev, "usb2-0");

Looks like you're getting the first phy? If so, can we just use
devm_of_phy_get_by_index(dev, dev->of_node, 0) instead of hard coding
the names?

Thanks,
Thinh

> +
> +	if (IS_ERR(phy)) {
> +		if (PTR_ERR(phy) != -ENODEV)
> +			return dev_err_probe(dev, PTR_ERR(phy),
> +					     "failed to get usb2 phy\n");
> +		phy = NULL;
> +	}
> +	qcom->has_eusb2_phy = phy && (phy_get_type(phy) == PHY_TYPE_EUSB2);
> +
>  	qcom->mode = usb_get_dr_mode(dev);
>  
>  	if (qcom->mode == USB_DR_MODE_HOST) {
> 
> -- 
> 2.34.1
>