From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0471C2BBD4 for ; Fri, 18 Dec 2020 12:12:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A40423A51 for ; Fri, 18 Dec 2020 12:12:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727129AbgLRMMO (ORCPT ); Fri, 18 Dec 2020 07:12:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725908AbgLRMMK (ORCPT ); Fri, 18 Dec 2020 07:12:10 -0500 Received: from mail-lf1-x12a.google.com (mail-lf1-x12a.google.com [IPv6:2a00:1450:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DCE4C06138C; Fri, 18 Dec 2020 04:11:30 -0800 (PST) Received: by mail-lf1-x12a.google.com with SMTP id o19so4919501lfo.1; Fri, 18 Dec 2020 04:11:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Q/bU62CcBcDUEEC+SqfuI7SeeQ/iVy39fG9zlA6evc8=; b=OErIWO3YL9Lk+F89USfuwo5+rPktnkjsliFFHO0wcyHgH7bzQu205mNtz6X43k+yOf 7rZ3GgSHh/WSi9Z60t6j4ciEhdXfYrBz8C+KFksuIIaO5TORq7CD846/AbggsxySnxNX xT6RnQGHiVuEmGhigUNI0+x48V1tn+07QcXTMlMatZkc3jNqMcVKDi+3cbakUzzm3DE1 pYckRe1tYbUN9IjTxiLUonKa7XPFgP1tgHXIJ6woGmkFHP6wqJ0CNz+A/32SD8S+ApGN y9yxnV/PlZ2osEHfHlT5rMGHLxqSumpzOZa8CfJ0u1aZzL1lr6p34TIJ2LV72JUb0Nus 9nMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Q/bU62CcBcDUEEC+SqfuI7SeeQ/iVy39fG9zlA6evc8=; b=B2vX+ZbLqFtKTTVaB4M/JjuZnGd1OZR0kWsJEX82a3dNGYLGHXb82hcb82CQ5dHfxE 4Dy0bUu3wMZVyyg1kalOTlT5BSM9nU0N1Uln071eIjYTysTuY+d37eGutk/j8395lB08 k5soLLE7W+LtVb9l3dWQmPCr5Pm5QvCfZi/WKab6Af/uaiHYxiEkdLame1J4NEesZ0mq jmRsJ0VUk1CV/FwjeUBll32kU2fYXVs8gz+/Bvs1DEKiUQJHzTvR3YPAgqHDl3A8mWAq 9tqR7uiRGDuPNbB0XvblyWOmDjdYNPM/xrcvTzVs2bGfdM4E0FIitbUUClwt5czi3iyW vleQ== X-Gm-Message-State: AOAM5304kL49BNxFPxjw58rr1ISFoKEZOC1/j5hBKikVwFujIpcNKlFZ r7eT3BIIfg1QgNSQ4739ei8= X-Google-Smtp-Source: ABdhPJw0k62mEMl9cAN6Zdf8iOOOYoQmNjlSbG8K5pnh2YS0kXGfuztvkd21qPJOgLqZrRbe9x7uOQ== X-Received: by 2002:a05:6512:10ce:: with SMTP id k14mr1273984lfg.177.1608293488853; Fri, 18 Dec 2020 04:11:28 -0800 (PST) Received: from localhost.localdomain (109-252-192-57.dynamic.spd-mgts.ru. [109.252.192.57]) by smtp.gmail.com with ESMTPSA id i9sm1036472ljn.18.2020.12.18.04.11.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Dec 2020 04:11:28 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Peter Chen , Greg Kroah-Hartman , Alan Stern , Felipe Balbi , Matt Merhar , Nicolas Chauvet , Peter Geis , Ion Agorria Cc: linux-tegra@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/9] usb: phy: tegra: Add delay after power up Date: Fri, 18 Dec 2020 15:02:38 +0300 Message-Id: <20201218120246.7759-2-digetx@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201218120246.7759-1-digetx@gmail.com> References: <20201218120246.7759-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The PHY hardware needs the delay of 2ms after power up, otherwise initial interrupt may be lost if USB controller is accessed before PHY is settled down. Previously this issue was masked by implicit delays, but now it pops up after squashing the older ehci-tegra driver into the ChipIdea driver. Tested-by: Matt Merhar Tested-by: Nicolas Chauvet Tested-by: Peter Geis Tested-by: Ion Agorria Acked-by: Thierry Reding Signed-off-by: Dmitry Osipenko --- drivers/usb/phy/phy-tegra-usb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c index 03a333797382..1296524e1bee 100644 --- a/drivers/usb/phy/phy-tegra-usb.c +++ b/drivers/usb/phy/phy-tegra-usb.c @@ -784,6 +784,9 @@ static int tegra_usb_phy_power_on(struct tegra_usb_phy *phy) phy->powered_on = true; + /* Let PHY settle down */ + usleep_range(2000, 2500); + return 0; } -- 2.29.2