Re: [PATCH 5/9] usb: roles: Provide the switch drivers handle to the switch in the API

From: Peter Chen
Date: Tue Feb 18 2020 - 02:23:56 EST

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On 20-02-13 15:32:39, Heikki Krogerus wrote:
> Hi guys,
>
> On Thu, Feb 13, 2020 at 04:24:24PM +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@xxxxxxx>
> > Cc: Felipe Balbi <balbi@xxxxxxxxxx>
> > Cc: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> > Cc: Bin Liu <b-liu@xxxxxx>
>
> This was meant for you guys, but I suppressed CC for everybody. Sorry
> about that.
>
> > Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> > ---
> > 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(-)
> >
> > 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);

Why the struct usb_role_switch_desc needs drvdata, the struct
usb_role_switch has already one?

Peter
> > 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
> > --
> > 2.25.0
>
> thanks,
>
> --
> heikki

--

Thanks,
Peter Chen

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