Message-ID: <1581759202.3473.11.camel@mhfsdcap03>
Date:   Sat, 15 Feb 2020 17:33:22 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        "Mika Westerberg" <mika.westerberg@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 5/9] usb: roles: Provide the switch drivers handle to
 the switch in the API

On Thu, 2020-02-13 at 16:24 +0300, Heikki Krogerus wrote:
> The USB role callback functions had a parameter pointing to
> the parent device (struct device) of the switch. The
> assumption was that the switch parent is always the
> controller. Firstly, that may not be true in every case, and
> secondly, it prevents us from supporting devices that supply
> multiple muxes.
> 
> Changing the first parameter of usb_role_switch_set_t and
> usb_role_switch_get_t from struct device to struct
> usb_role_switch.
> 
> Cc: Peter Chen <Peter.Chen@....com>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Cc: Bin Liu <b-liu@...com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  drivers/usb/cdns3/core.c                      | 10 ++++---
>  drivers/usb/chipidea/core.c                   | 10 ++++---
>  drivers/usb/dwc3/dwc3-meson-g12a.c            | 10 ++++---
>  drivers/usb/gadget/udc/renesas_usb3.c         | 26 ++++++++++---------
>  drivers/usb/gadget/udc/tegra-xudc.c           |  8 +++---
>  drivers/usb/mtu3/mtu3_dr.c                    |  9 ++++---
>  drivers/usb/musb/mediatek.c                   |  9 ++++---
>  drivers/usb/roles/class.c                     |  4 +--
>  .../usb/roles/intel-xhci-usb-role-switch.c    | 26 +++++++++++--------
>  include/linux/usb/role.h                      |  5 ++--
>  10 files changed, 67 insertions(+), 50 deletions(-)

Looks good to me for mtu3/mtu3_dr.c and musb/mediatek.c

Only build pass, but have no platforms to test it due to n-COV and work
at home now, so

Reviewed-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

> 
> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> index c2123ef8d8a3..a7a7cb9a2a48 100644
> --- a/drivers/usb/cdns3/core.c
> +++ b/drivers/usb/cdns3/core.c
> @@ -330,9 +330,9 @@ int cdns3_hw_role_switch(struct cdns3 *cdns)
>   *
>   * Returns role
>   */
> -static enum usb_role cdns3_role_get(struct device *dev)
> +static enum usb_role cdns3_role_get(struct usb_role_switch *sw)
>  {
> -	struct cdns3 *cdns = dev_get_drvdata(dev);
> +	struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
>  
>  	return cdns->role;
>  }
> @@ -346,9 +346,9 @@ static enum usb_role cdns3_role_get(struct device *dev)
>   * - Role switch for dual-role devices
>   * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
>   */
> -static int cdns3_role_set(struct device *dev, enum usb_role role)
> +static int cdns3_role_set(struct usb_role_switch *sw, enum usb_role role)
>  {
> -	struct cdns3 *cdns = dev_get_drvdata(dev);
> +	struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
>  	int ret = 0;
>  
>  	pm_runtime_get_sync(cdns->dev);
> @@ -536,6 +536,8 @@ static int cdns3_probe(struct platform_device *pdev)
>  		goto err4;
>  	}
>  
> +	usb_role_switch_set_drvdata(cdns->role_sw, cdns);
> +
>  	ret = cdns3_drd_init(cdns);
>  	if (ret)
>  		goto err5;
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 52139c2a9924..ae0bdc036464 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -600,9 +600,9 @@ static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
>  	return NOTIFY_DONE;
>  }
>  
> -static enum usb_role ci_usb_role_switch_get(struct device *dev)
> +static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
>  {
> -	struct ci_hdrc *ci = dev_get_drvdata(dev);
> +	struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
>  	enum usb_role role;
>  	unsigned long flags;
>  
> @@ -613,9 +613,10 @@ static enum usb_role ci_usb_role_switch_get(struct device *dev)
>  	return role;
>  }
>  
> -static int ci_usb_role_switch_set(struct device *dev, enum usb_role role)
> +static int ci_usb_role_switch_set(struct usb_role_switch *sw,
> +				  enum usb_role role)
>  {
> -	struct ci_hdrc *ci = dev_get_drvdata(dev);
> +	struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
>  	struct ci_hdrc_cable *cable = NULL;
>  	enum usb_role current_role = ci_role_to_usb_role(ci);
>  	enum ci_role ci_role = usb_role_to_ci_role(role);
> @@ -1118,6 +1119,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
>  	}
>  
>  	if (ci_role_switch.fwnode) {
> +		ci_role_switch.driver_data = ci;
>  		ci->role_switch = usb_role_switch_register(dev,
>  					&ci_role_switch);
>  		if (IS_ERR(ci->role_switch)) {
> diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
> index 8a3ec1a951fe..3309ce90ca14 100644
> --- a/drivers/usb/dwc3/dwc3-meson-g12a.c
> +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
> @@ -321,9 +321,10 @@ static int dwc3_meson_g12a_otg_mode_set(struct dwc3_meson_g12a *priv,
>  	return 0;
>  }
>  
> -static int dwc3_meson_g12a_role_set(struct device *dev, enum usb_role role)
> +static int dwc3_meson_g12a_role_set(struct usb_role_switch *sw,
> +				    enum usb_role role)
>  {
> -	struct dwc3_meson_g12a *priv = dev_get_drvdata(dev);
> +	struct dwc3_meson_g12a *priv = usb_role_switch_get_drvdata(sw);
>  	enum phy_mode mode;
>  
>  	if (role == USB_ROLE_NONE)
> @@ -338,9 +339,9 @@ static int dwc3_meson_g12a_role_set(struct device *dev, enum usb_role role)
>  	return dwc3_meson_g12a_otg_mode_set(priv, mode);
>  }
>  
> -static enum usb_role dwc3_meson_g12a_role_get(struct device *dev)
> +static enum usb_role dwc3_meson_g12a_role_get(struct usb_role_switch *sw)
>  {
> -	struct dwc3_meson_g12a *priv = dev_get_drvdata(dev);
> +	struct dwc3_meson_g12a *priv = usb_role_switch_get_drvdata(sw);
>  
>  	return priv->otg_phy_mode == PHY_MODE_USB_HOST ?
>  		USB_ROLE_HOST : USB_ROLE_DEVICE;
> @@ -499,6 +500,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
>  	priv->switch_desc.allow_userspace_control = true;
>  	priv->switch_desc.set = dwc3_meson_g12a_role_set;
>  	priv->switch_desc.get = dwc3_meson_g12a_role_get;
> +	priv->switch_desc.driver_data = priv;
>  
>  	priv->role_switch = usb_role_switch_register(dev, &priv->switch_desc);
>  	if (IS_ERR(priv->role_switch))
> diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
> index c5c3c14df67a..4da90160b400 100644
> --- a/drivers/usb/gadget/udc/renesas_usb3.c
> +++ b/drivers/usb/gadget/udc/renesas_usb3.c
> @@ -2355,14 +2355,14 @@ static const struct usb_gadget_ops renesas_usb3_gadget_ops = {
>  	.set_selfpowered	= renesas_usb3_set_selfpowered,
>  };
>  
> -static enum usb_role renesas_usb3_role_switch_get(struct device *dev)
> +static enum usb_role renesas_usb3_role_switch_get(struct usb_role_switch *sw)
>  {
> -	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
> +	struct renesas_usb3 *usb3 = usb_role_switch_get_drvdata(sw);
>  	enum usb_role cur_role;
>  
> -	pm_runtime_get_sync(dev);
> +	pm_runtime_get_sync(usb3_to_dev(usb3));
>  	cur_role = usb3_is_host(usb3) ? USB_ROLE_HOST : USB_ROLE_DEVICE;
> -	pm_runtime_put(dev);
> +	pm_runtime_put(usb3_to_dev(usb3));
>  
>  	return cur_role;
>  }
> @@ -2372,7 +2372,7 @@ static void handle_ext_role_switch_states(struct device *dev,
>  {
>  	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
>  	struct device *host = usb3->host_dev;
> -	enum usb_role cur_role = renesas_usb3_role_switch_get(dev);
> +	enum usb_role cur_role = renesas_usb3_role_switch_get(usb3->role_sw);
>  
>  	switch (role) {
>  	case USB_ROLE_NONE:
> @@ -2424,7 +2424,7 @@ static void handle_role_switch_states(struct device *dev,
>  {
>  	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
>  	struct device *host = usb3->host_dev;
> -	enum usb_role cur_role = renesas_usb3_role_switch_get(dev);
> +	enum usb_role cur_role = renesas_usb3_role_switch_get(usb3->role_sw);
>  
>  	if (cur_role == USB_ROLE_HOST && role == USB_ROLE_DEVICE) {
>  		device_release_driver(host);
> @@ -2438,19 +2438,19 @@ static void handle_role_switch_states(struct device *dev,
>  	}
>  }
>  
> -static int renesas_usb3_role_switch_set(struct device *dev,
> +static int renesas_usb3_role_switch_set(struct usb_role_switch *sw,
>  					enum usb_role role)
>  {
> -	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
> +	struct renesas_usb3 *usb3 = usb_role_switch_get_drvdata(sw);
>  
> -	pm_runtime_get_sync(dev);
> +	pm_runtime_get_sync(usb3_to_dev(usb3));
>  
>  	if (usb3->role_sw_by_connector)
> -		handle_ext_role_switch_states(dev, role);
> +		handle_ext_role_switch_states(usb3_to_dev(usb3), role);
>  	else
> -		handle_role_switch_states(dev, role);
> +		handle_role_switch_states(usb3_to_dev(usb3), role);
>  
> -	pm_runtime_put(dev);
> +	pm_runtime_put(usb3_to_dev(usb3));
>  
>  	return 0;
>  }
> @@ -2831,6 +2831,8 @@ static int renesas_usb3_probe(struct platform_device *pdev)
>  		renesas_usb3_role_switch_desc.fwnode = dev_fwnode(&pdev->dev);
>  	}
>  
> +	renesas_usb3_role_switch_desc.driver_data = usb3;
> +
>  	INIT_WORK(&usb3->role_work, renesas_usb3_role_work);
>  	usb3->role_sw = usb_role_switch_register(&pdev->dev,
>  					&renesas_usb3_role_switch_desc);
> diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
> index 634c2c19a176..b9df6369d56d 100644
> --- a/drivers/usb/gadget/udc/tegra-xudc.c
> +++ b/drivers/usb/gadget/udc/tegra-xudc.c
> @@ -676,12 +676,13 @@ static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
>  
>  }
>  
> -static int tegra_xudc_usb_role_sw_set(struct device *dev, enum usb_role role)
> +static int tegra_xudc_usb_role_sw_set(struct usb_role_switch *sw,
> +				      enum usb_role role)
>  {
> -	struct tegra_xudc *xudc = dev_get_drvdata(dev);
> +	struct tegra_xudc *xudc = usb_role_switch_get_drvdata(sw);
>  	unsigned long flags;
>  
> -	dev_dbg(dev, "%s role is %d\n", __func__, role);
> +	dev_dbg(xudc->dev, "%s role is %d\n", __func__, role);
>  
>  	spin_lock_irqsave(&xudc->lock, flags);
>  
> @@ -3590,6 +3591,7 @@ static int tegra_xudc_probe(struct platform_device *pdev)
>  	if (of_property_read_bool(xudc->dev->of_node, "usb-role-switch")) {
>  		role_sx_desc.set = tegra_xudc_usb_role_sw_set;
>  		role_sx_desc.fwnode = dev_fwnode(xudc->dev);
> +		role_sx_desc.driver_data = xudc;
>  
>  		xudc->usb_role_sw = usb_role_switch_register(xudc->dev,
>  							&role_sx_desc);
> diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c
> index 08e18448e8b8..04f666e85731 100644
> --- a/drivers/usb/mtu3/mtu3_dr.c
> +++ b/drivers/usb/mtu3/mtu3_dr.c
> @@ -320,9 +320,9 @@ void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
>  	mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
>  }
>  
> -static int ssusb_role_sw_set(struct device *dev, enum usb_role role)
> +static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)
>  {
> -	struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
> +	struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
>  	bool to_host = false;
>  
>  	if (role == USB_ROLE_HOST)
> @@ -334,9 +334,9 @@ static int ssusb_role_sw_set(struct device *dev, enum usb_role role)
>  	return 0;
>  }
>  
> -static enum usb_role ssusb_role_sw_get(struct device *dev)
> +static enum usb_role ssusb_role_sw_get(struct usb_role_switch *sw)
>  {
> -	struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
> +	struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
>  	enum usb_role role;
>  
>  	role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
> @@ -356,6 +356,7 @@ static int ssusb_role_sw_register(struct otg_switch_mtk *otg_sx)
>  	role_sx_desc.set = ssusb_role_sw_set;
>  	role_sx_desc.get = ssusb_role_sw_get;
>  	role_sx_desc.fwnode = dev_fwnode(ssusb->dev);
> +	role_sx_desc.driver_data = ssusb;
>  	otg_sx->role_sw = usb_role_switch_register(ssusb->dev, &role_sx_desc);
>  
>  	return PTR_ERR_OR_ZERO(otg_sx->role_sw);
> diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
> index 6b88c2f5d970..703b98d71180 100644
> --- a/drivers/usb/musb/mediatek.c
> +++ b/drivers/usb/musb/mediatek.c
> @@ -115,9 +115,9 @@ static void mtk_musb_clks_disable(struct mtk_glue *glue)
>  	clk_disable_unprepare(glue->main);
>  }
>  
> -static int musb_usb_role_sx_set(struct device *dev, enum usb_role role)
> +static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
>  {
> -	struct mtk_glue *glue = dev_get_drvdata(dev);
> +	struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);
>  	struct musb *musb = glue->musb;
>  	u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
>  	enum usb_role new_role;
> @@ -168,9 +168,9 @@ static int musb_usb_role_sx_set(struct device *dev, enum usb_role role)
>  	return 0;
>  }
>  
> -static enum usb_role musb_usb_role_sx_get(struct device *dev)
> +static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
>  {
> -	struct mtk_glue *glue = dev_get_drvdata(dev);
> +	struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);
>  
>  	return glue->role;
>  }
> @@ -182,6 +182,7 @@ static int mtk_otg_switch_init(struct mtk_glue *glue)
>  	role_sx_desc.set = musb_usb_role_sx_set;
>  	role_sx_desc.get = musb_usb_role_sx_get;
>  	role_sx_desc.fwnode = dev_fwnode(glue->dev);
> +	role_sx_desc.driver_data = glue;
>  	glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc);
>  
>  	return PTR_ERR_OR_ZERO(glue->role_sw);
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index f3132d231599..d5e57d26c31f 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -48,7 +48,7 @@ int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role)
>  
>  	mutex_lock(&sw->lock);
>  
> -	ret = sw->set(sw->dev.parent, role);
> +	ret = sw->set(sw, role);
>  	if (!ret)
>  		sw->role = role;
>  
> @@ -75,7 +75,7 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>  	mutex_lock(&sw->lock);
>  
>  	if (sw->get)
> -		role = sw->get(sw->dev.parent);
> +		role = sw->get(sw);
>  	else
>  		role = sw->role;
>  
> diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> index 80d6559bbcb2..5c96e929acea 100644
> --- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
> +++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
> @@ -42,6 +42,7 @@
>  #define DRV_NAME			"intel_xhci_usb_sw"
>  
>  struct intel_xhci_usb_data {
> +	struct device *dev;
>  	struct usb_role_switch *role_sw;
>  	void __iomem *base;
>  	bool enable_sw_switch;
> @@ -51,9 +52,10 @@ static const struct software_node intel_xhci_usb_node = {
>  	"intel-xhci-usb-sw",
>  };
>  
> -static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
> +static int intel_xhci_usb_set_role(struct usb_role_switch *sw,
> +				   enum usb_role role)
>  {
> -	struct intel_xhci_usb_data *data = dev_get_drvdata(dev);
> +	struct intel_xhci_usb_data *data = usb_role_switch_get_drvdata(sw);
>  	unsigned long timeout;
>  	acpi_status status;
>  	u32 glk, val;
> @@ -66,11 +68,11 @@ static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
>  	 */
>  	status = acpi_acquire_global_lock(ACPI_WAIT_FOREVER, &glk);
>  	if (ACPI_FAILURE(status) && status != AE_NOT_CONFIGURED) {
> -		dev_err(dev, "Error could not acquire lock\n");
> +		dev_err(data->dev, "Error could not acquire lock\n");
>  		return -EIO;
>  	}
>  
> -	pm_runtime_get_sync(dev);
> +	pm_runtime_get_sync(data->dev);
>  
>  	/*
>  	 * Set idpin value as requested.
> @@ -112,7 +114,7 @@ static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
>  	do {
>  		val = readl(data->base + DUAL_ROLE_CFG1);
>  		if (!!(val & HOST_MODE) == (role == USB_ROLE_HOST)) {
> -			pm_runtime_put(dev);
> +			pm_runtime_put(data->dev);
>  			return 0;
>  		}
>  
> @@ -120,21 +122,21 @@ static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
>  		usleep_range(5000, 10000);
>  	} while (time_before(jiffies, timeout));
>  
> -	pm_runtime_put(dev);
> +	pm_runtime_put(data->dev);
>  
> -	dev_warn(dev, "Timeout waiting for role-switch\n");
> +	dev_warn(data->dev, "Timeout waiting for role-switch\n");
>  	return -ETIMEDOUT;
>  }
>  
> -static enum usb_role intel_xhci_usb_get_role(struct device *dev)
> +static enum usb_role intel_xhci_usb_get_role(struct usb_role_switch *sw)
>  {
> -	struct intel_xhci_usb_data *data = dev_get_drvdata(dev);
> +	struct intel_xhci_usb_data *data = usb_role_switch_get_drvdata(sw);
>  	enum usb_role role;
>  	u32 val;
>  
> -	pm_runtime_get_sync(dev);
> +	pm_runtime_get_sync(data->dev);
>  	val = readl(data->base + DUAL_ROLE_CFG0);
> -	pm_runtime_put(dev);
> +	pm_runtime_put(data->dev);
>  
>  	if (!(val & SW_IDPIN))
>  		role = USB_ROLE_HOST;
> @@ -175,7 +177,9 @@ static int intel_xhci_usb_probe(struct platform_device *pdev)
>  	sw_desc.get = intel_xhci_usb_get_role,
>  	sw_desc.allow_userspace_control = true,
>  	sw_desc.fwnode = software_node_fwnode(&intel_xhci_usb_node);
> +	sw_desc.driver_data = data;
>  
> +	data->dev = dev;
>  	data->enable_sw_switch = !device_property_read_bool(dev,
>  						"sw_switch_disable");
>  
> diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
> index 02dae936cebd..c028ba8029ad 100644
> --- a/include/linux/usb/role.h
> +++ b/include/linux/usb/role.h
> @@ -13,8 +13,9 @@ enum usb_role {
>  	USB_ROLE_DEVICE,
>  };
>  
> -typedef int (*usb_role_switch_set_t)(struct device *dev, enum usb_role role);
> -typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);
> +typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
> +				     enum usb_role role);
> +typedef enum usb_role (*usb_role_switch_get_t)(struct usb_role_switch *sw);
>  
>  /**
>   * struct usb_role_switch_desc - USB Role Switch Descriptor

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