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. > 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" ? > + 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
