On some Broxton NUC, the usb role is lost after S3 (it becomes "none"). Add PM callbacks to address this issue: save the role during suspend and restore usb to that role during resume. Test: Run Android on UC6CAY, a NUC powered by Broxton. Access this NUC via "adb shell" from a host PC. After a suspend/resume cycle, the adb still works well. Signed-off-by: Chen, Hu <hu1.chen@xxxxxxxxx> Signed-off-by: Balaji <m.balaji@xxxxxxxxx> diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c index 277de96181f9..caa1cfab41cc 100644 --- a/drivers/usb/roles/intel-xhci-usb-role-switch.c +++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c @@ -37,6 +37,7 @@ struct intel_xhci_usb_data { struct usb_role_switch *role_sw; void __iomem *base; + enum usb_role role; }; static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role) @@ -167,6 +168,30 @@ static int intel_xhci_usb_remove(struct platform_device *pdev) return 0; } +static int intel_xhci_usb_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct intel_xhci_usb_data *data = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + data->role = intel_xhci_usb_get_role(dev); + + return 0; +} + +static int intel_xhci_usb_resume(struct platform_device *pdev) +{ + struct intel_xhci_usb_data *data = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + if (intel_xhci_usb_get_role(dev) != data->role) { + if (intel_xhci_usb_set_role(dev, data->role) != 0) + dev_warn(dev, "Failed to set role during resume\n"); + } + + return 0; +} + static const struct platform_device_id intel_xhci_usb_table[] = { { .name = DRV_NAME }, {} @@ -180,6 +205,8 @@ static struct platform_driver intel_xhci_usb_driver = { .id_table = intel_xhci_usb_table, .probe = intel_xhci_usb_probe, .remove = intel_xhci_usb_remove, + .suspend = intel_xhci_usb_suspend, + .resume = intel_xhci_usb_resume, }; module_platform_driver(intel_xhci_usb_driver); -- 2.22.0