From patchwork Tue Jun 27 08:19:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?U3RhbmxleSBDaGFuZ1vmmIzogrLlvrdd?= X-Patchwork-Id: 697891 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70BA7C0015E for ; Tue, 27 Jun 2023 08:21:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231636AbjF0IVw (ORCPT ); Tue, 27 Jun 2023 04:21:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231617AbjF0IVt (ORCPT ); Tue, 27 Jun 2023 04:21:49 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id DFBB91B1; Tue, 27 Jun 2023 01:21:46 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 35R8KNutC003421, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36506.realtek.com.tw[172.21.6.27]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 35R8KNutC003421 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 27 Jun 2023 16:20:23 +0800 Received: from RTEXDAG02.realtek.com.tw (172.21.6.101) by RTEXH36506.realtek.com.tw (172.21.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Tue, 27 Jun 2023 16:20:23 +0800 Received: from RTEXH36505.realtek.com.tw (172.21.6.25) by RTEXDAG02.realtek.com.tw (172.21.6.101) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Tue, 27 Jun 2023 16:20:22 +0800 Received: from localhost.localdomain (172.21.252.101) by RTEXH36505.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server id 15.1.2375.32 via Frontend Transport; Tue, 27 Jun 2023 16:20:22 +0800 From: Stanley Chang To: Greg Kroah-Hartman CC: Stanley Chang , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alan Stern , Ray Chi , Bagas Sanjaya , Matthias Kaehlcke , Flavio Suligoi , , , , Subject: [PATCH v5 1/5] usb: phy: add usb phy notify port status API Date: Tue, 27 Jun 2023 16:19:57 +0800 Message-ID: <20230627082022.22902-1-stanley_chang@realtek.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-KSE-ServerInfo: RTEXDAG02.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-Antivirus-Interceptor-Info: fallback X-KSE-AntiSpam-Interceptor-Info: fallback Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org In Realtek SoC, the parameter of usb phy is designed to can dynamic tuning base on port status. Therefore, add a notify callback of phy driver when usb port status change. The Realtek phy driver is designed to dynamically adjust disconnection level and calibrate phy parameters. When the device connected bit changes and when the disconnected bit changes, do port status change notification: Check if portstatus is USB_PORT_STAT_CONNECTION and portchange is USB_PORT_STAT_C_CONNECTION. 1. The device is connected, the driver lowers the disconnection level and calibrates the phy parameters. 2. The device disconnects, the driver increases the disconnect level and calibrates the phy parameters. When controller to notify connect that device is already ready. If we adjust the disconnection level in notify_connect, the disconnect may have been triggered at this stage. So we need to change that as early as possible. Therefore, we add an api to notify phy the port status changes. Signed-off-by: Stanley Chang --- v4 to v5 change: No change v3 to v4 change: Fix the warning for checkpatch with strict. v2 to v3 change: Add more comments about the reason for adding this api v1 to v2 change: No change --- drivers/usb/core/hub.c | 13 +++++++++++++ include/linux/usb/phy.h | 13 +++++++++++++ 2 files changed, 26 insertions(+) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 97a0f8faea6e..10f3364c3fc2 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -614,6 +614,19 @@ static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, ret = 0; } mutex_unlock(&hub->status_mutex); + + if (!ret) { + struct usb_device *hdev = hub->hdev; + + if (hdev && !hdev->parent) { + struct usb_hcd *hcd = bus_to_hcd(hdev->bus); + + if (hcd->usb_phy) + usb_phy_notify_port_status(hcd->usb_phy, + port1 - 1, *status, *change); + } + } + return ret; } diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h index e4de6bc1f69b..b513749582d7 100644 --- a/include/linux/usb/phy.h +++ b/include/linux/usb/phy.h @@ -144,6 +144,10 @@ struct usb_phy { */ int (*set_wakeup)(struct usb_phy *x, bool enabled); + /* notify phy port status change */ + int (*notify_port_status)(struct usb_phy *x, int port, + u16 portstatus, u16 portchange); + /* notify phy connect status change */ int (*notify_connect)(struct usb_phy *x, enum usb_device_speed speed); @@ -316,6 +320,15 @@ usb_phy_set_wakeup(struct usb_phy *x, bool enabled) return 0; } +static inline int +usb_phy_notify_port_status(struct usb_phy *x, int port, u16 portstatus, u16 portchange) +{ + if (x && x->notify_port_status) + return x->notify_port_status(x, port, portstatus, portchange); + else + return 0; +} + static inline int usb_phy_notify_connect(struct usb_phy *x, enum usb_device_speed speed) {