On Tue, Feb 8, 2022 at 11:54 AM Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> wrote: > > Andrey Smirnov wrote: > > It is necessary that: > > > > ROLE_SWITCH && device_property_read_bool(dwc->dev, "usb-role-switch") > > > > is true in order for dwc3_get_dr_mode() to _not_ force us from OTG to > > PERIPHERAL mode here: > > > > if (mode == USB_DR_MODE_OTG && > > (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) || > > !device_property_read_bool(dwc->dev, "usb-role-switch")) && > > !DWC3_VER_IS_PRIOR(DWC3, 330A)) > > mode = USB_DR_MODE_PERIPHERAL; > > > > and dwc3_drd_init() to be called later in dwc3_core_init_mode(). To > > avoid always ignoring extcon device returned by dwc3_get_extcon() > > modify the above check to also account for dwc->edev. > > > > I think the commit message is a bit difficult to follow. Can we rephrase > it to something like this: > > If the extcon device exists, get the mode from the extcon device. If the > controller is DRD and the driver is unable to determine the mode, only > then default the dr_mode to USB_DR_MODE_PERIPHERAL. > Sure, will do. > > > Cc: Felipe Balbi <balbi@xxxxxxxxxx> > > Cc: Thinh Nguyen <thinhn@xxxxxxxxxxxx> > > Cc: linux-usb@xxxxxxxxxxxxxxx > > Cc: linux-kernel@xxxxxxxxxxxxxxx > > Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx> > > --- > > > > Previous discussion: > > > > https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/20220131192102.4115473-1-andrew.smirnov@xxxxxxxxx/__;!!A4F2R9G_pg!OlXelv3-qdUChbfoT9-Qttv4PH8DDro1dSzIj6xEN7x3Vkv8jeh8unvO4RvolUA$ > > > > drivers/usb/dwc3/core.c | 55 ++++++++++++++++++++++++++++++++++++++++- > > drivers/usb/dwc3/drd.c | 50 ------------------------------------- > > 2 files changed, 54 insertions(+), 51 deletions(-) > > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > > index f2448d0a9d39..0ae152e47a00 100644 > > --- a/drivers/usb/dwc3/core.c > > +++ b/drivers/usb/dwc3/core.c > > @@ -23,6 +23,7 @@ > > #include <linux/delay.h> > > #include <linux/dma-mapping.h> > > #include <linux/of.h> > > +#include <linux/of_graph.h> > > #include <linux/acpi.h> > > #include <linux/pinctrl/consumer.h> > > #include <linux/reset.h> > > @@ -84,7 +85,7 @@ static int dwc3_get_dr_mode(struct dwc3 *dwc) > > * mode. If the controller supports DRD but the dr_mode is not > > * specified or set to OTG, then set the mode to peripheral. > > */ > > - if (mode == USB_DR_MODE_OTG && > > + if (mode == USB_DR_MODE_OTG && !dwc->edev && > > (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) || > > !device_property_read_bool(dwc->dev, "usb-role-switch")) && > > !DWC3_VER_IS_PRIOR(DWC3, 330A)) > > @@ -1462,6 +1463,51 @@ static void dwc3_check_params(struct dwc3 *dwc) > > } > > } > > > > +static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc) > > +{ > > + struct device *dev = dwc->dev; > > + struct device_node *np_phy; > > + struct extcon_dev *edev = NULL; > > + const char *name; > > + > > + if (device_property_read_bool(dev, "extcon")) > > + return extcon_get_edev_by_phandle(dev, 0); > > + > > + /* > > + * Device tree platforms should get extcon via phandle. > > + * On ACPI platforms, we get the name from a device property. > > + * This device property is for kernel internal use only and > > + * is expected to be set by the glue code. > > + */ > > + if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) { > > + edev = extcon_get_extcon_dev(name); > > + if (!edev) > > + return ERR_PTR(-EPROBE_DEFER); > > + > > + return edev; > > + } > > + > > + /* > > + * Try to get an extcon device from the USB PHY controller's "port" > > + * node. Check if it has the "port" node first, to avoid printing the > > + * error message from underlying code, as it's a valid case: extcon > > + * device (and "port" node) may be missing in case of "usb-role-switch" > > + * or OTG mode. > > + */ > > + np_phy = of_parse_phandle(dev->of_node, "phys", 0); > > + if (of_graph_is_present(np_phy)) { > > + struct device_node *np_conn; > > + > > + np_conn = of_graph_get_remote_node(np_phy, -1, -1); > > + if (np_conn) > > + edev = extcon_find_edev_by_node(np_conn); > > + of_node_put(np_conn); > > + } > > + of_node_put(np_phy); > > + > > + return edev; > > +} > > + > > static int dwc3_probe(struct platform_device *pdev) > > { > > struct device *dev = &pdev->dev; > > @@ -1561,6 +1607,13 @@ static int dwc3_probe(struct platform_device *pdev) > > goto err2; > > } > > > > + dwc->edev = dwc3_get_extcon(dwc); > > + if (IS_ERR(dwc->edev)) { > > + ret = PTR_ERR(dwc->edev); > > + dev_err_probe(dwc->dev, ret, "failed to get extcon"); > > add "\n" ? Sure, will do. > > > + goto err3; > > + } > > + > > ret = dwc3_get_dr_mode(dwc); > > if (ret) > > goto err3; > > diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c > > index e2b68bb770d1..9a414edc439a 100644 > > --- a/drivers/usb/dwc3/drd.c > > +++ b/drivers/usb/dwc3/drd.c > > @@ -8,7 +8,6 @@ > > */ > > > > #include <linux/extcon.h> > > -#include <linux/of_graph.h> > > #include <linux/platform_device.h> > > #include <linux/property.h> > > > > @@ -438,51 +437,6 @@ static int dwc3_drd_notifier(struct notifier_block *nb, > > return NOTIFY_DONE; > > } > > > > -static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc) > > -{ > > - struct device *dev = dwc->dev; > > - struct device_node *np_phy; > > - struct extcon_dev *edev = NULL; > > - const char *name; > > - > > - if (device_property_read_bool(dev, "extcon")) > > - return extcon_get_edev_by_phandle(dev, 0); > > - > > - /* > > - * Device tree platforms should get extcon via phandle. > > - * On ACPI platforms, we get the name from a device property. > > - * This device property is for kernel internal use only and > > - * is expected to be set by the glue code. > > - */ > > - if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) { > > - edev = extcon_get_extcon_dev(name); > > - if (!edev) > > - return ERR_PTR(-EPROBE_DEFER); > > - > > - return edev; > > - } > > - > > - /* > > - * Try to get an extcon device from the USB PHY controller's "port" > > - * node. Check if it has the "port" node first, to avoid printing the > > - * error message from underlying code, as it's a valid case: extcon > > - * device (and "port" node) may be missing in case of "usb-role-switch" > > - * or OTG mode. > > - */ > > - np_phy = of_parse_phandle(dev->of_node, "phys", 0); > > - if (of_graph_is_present(np_phy)) { > > - struct device_node *np_conn; > > - > > - np_conn = of_graph_get_remote_node(np_phy, -1, -1); > > - if (np_conn) > > - edev = extcon_find_edev_by_node(np_conn); > > - of_node_put(np_conn); > > - } > > - of_node_put(np_phy); > > - > > - return edev; > > -} > > - > > #if IS_ENABLED(CONFIG_USB_ROLE_SWITCH) > > #define ROLE_SWITCH 1 > > static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, > > @@ -575,10 +529,6 @@ int dwc3_drd_init(struct dwc3 *dwc) > > { > > int ret, irq; > > > > - dwc->edev = dwc3_get_extcon(dwc); > > - if (IS_ERR(dwc->edev)) > > - return PTR_ERR(dwc->edev); > > - > > if (ROLE_SWITCH && > > device_property_read_bool(dwc->dev, "usb-role-switch")) { > > ret = dwc3_setup_role_switch(dwc); > > -- > > 2.25.1 > > Reviewed-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> > > Thanks, > Thinh
