From: Andy Shevchenko andriy.shevchenko@linux.intel.com
commit 7a84e7353e23202d4f82b05093af4db2b26e6768 upstream.
This reverts commit 0f01017191384e3962fa31520a9fd9846c3d352f.
As pointed out by Ferry this breaks Dual Role support on Intel Merrifield platforms.
Fixes: 0f0101719138 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present") Reported-by: Ferry Toth fntoth@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Tested-by: Ferry Toth fntoth@gmail.com # for Merrifield Reviewed-by: Sven Peter sven@svenpeter.dev Link: https://lore.kernel.org/r/20220927155332.10762-3-andriy.shevchenko@linux.int... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/core.c | 55 ------------------------------------------------ drivers/usb/dwc3/drd.c | 50 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+), 54 deletions(-)
--- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -23,7 +23,6 @@ #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> @@ -86,7 +85,7 @@ static int dwc3_get_dr_mode(struct dwc3 * 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 && !dwc->edev && + 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)) @@ -1668,51 +1667,6 @@ static void dwc3_check_params(struct 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; @@ -1849,13 +1803,6 @@ static int dwc3_probe(struct platform_de 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\n"); - goto err3; - } - ret = dwc3_get_dr_mode(dwc); if (ret) goto err3; --- a/drivers/usb/dwc3/drd.c +++ b/drivers/usb/dwc3/drd.c @@ -8,6 +8,7 @@ */
#include <linux/extcon.h> +#include <linux/of_graph.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/property.h> @@ -438,6 +439,51 @@ static int dwc3_drd_notifier(struct noti 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, @@ -542,6 +588,10 @@ int dwc3_drd_init(struct dwc3 *dwc) device_property_read_bool(dwc->dev, "usb-role-switch")) return dwc3_setup_role_switch(dwc);
+ dwc->edev = dwc3_get_extcon(dwc); + if (IS_ERR(dwc->edev)) + return PTR_ERR(dwc->edev); + if (dwc->edev) { dwc->edev_nb.notifier_call = dwc3_drd_notifier; ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,