From patchwork Mon Jul 8 02:25:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Hu1" X-Patchwork-Id: 11034533 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4638913B1 for ; Mon, 8 Jul 2019 02:45:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3127328113 for ; Mon, 8 Jul 2019 02:45:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 205CE281E1; Mon, 8 Jul 2019 02:45:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A77528113 for ; Mon, 8 Jul 2019 02:45:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727455AbfGHCov (ORCPT ); Sun, 7 Jul 2019 22:44:51 -0400 Received: from mga04.intel.com ([192.55.52.120]:3515 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726105AbfGHCov (ORCPT ); Sun, 7 Jul 2019 22:44:51 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jul 2019 19:44:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,465,1557212400"; d="scan'208";a="340322921" Received: from hu.sh.intel.com ([10.239.158.51]) by orsmga005.jf.intel.com with ESMTP; 07 Jul 2019 19:44:49 -0700 From: "Chen, Hu" To: hdegoede@redhat.com Cc: hu1.chen@intel.com, Balaji , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: roles: Add PM callbacks Date: Mon, 8 Jul 2019 10:25:14 +0800 Message-Id: <20190708022514.7161-1-hu1.chen@intel.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Signed-off-by: Balaji 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);