From patchwork Tue Dec 15 20:21:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 344787 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=unavailable 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 B066EC4361B for ; Tue, 15 Dec 2020 20:23:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8216E22475 for ; Tue, 15 Dec 2020 20:23:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727693AbgLOUWg (ORCPT ); Tue, 15 Dec 2020 15:22:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727653AbgLOUW1 (ORCPT ); Tue, 15 Dec 2020 15:22:27 -0500 Received: from mail-lf1-x142.google.com (mail-lf1-x142.google.com [IPv6:2a00:1450:4864:20::142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38692C061257; Tue, 15 Dec 2020 12:21:47 -0800 (PST) Received: by mail-lf1-x142.google.com with SMTP id a9so42739612lfh.2; Tue, 15 Dec 2020 12:21:47 -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=wtdH0LNE+NSh6TW8ldGVLX31qyTyLDOz4GRbXPCqTQ0=; b=JJAwolf5vyTCjYLv6qT+h+KCPXlFFnj5p/D/kGRQVyqeVQv5XWe+HzpA5di+MRXj1E 9tzQGum618T5dEEjjTJ3Yn7QC8TPgeMhRdmAPkBBCrtiizeMzT37UnN+Vw166bORwWAD /folXNiPFzJeJvBdZOcze9xzFX2fQVEJxIkwwcA6ZmX8/gL5oDEKG/557dNdp9R8dEDN 035G5Sjp3t0m3wnzJdwn5p8UqcdJzTZryi4BHo8W6xeY7lc9tJ5AjdIzAtnuGHC9hbYA 5eH1CDY4ulErdyh92YwUhm99TR2cBBVYofUTsKCGIM9jL/eNGA3GkjzRt/sbuS3L+oEV gOSw== 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=wtdH0LNE+NSh6TW8ldGVLX31qyTyLDOz4GRbXPCqTQ0=; b=J+K8gGgdrp+YzB5x+PcGBWdHxdIL1OZ8MKjHfNu9InILSll9yoRrEyI0SWBB/AkboQ 5lpWe9DL0lKysZl+3SF/hhdnXK+E6Rw4hglRYApctkJrfQA4VIVZVFbLbTraXLNw0CVM 9Z9Hv5ZBYCj0DtyEcr11CntqzrBxrJ6LQ+4cxZxUmA6flI5OVOscNyoEJngOTJQxFFUh vlh8IPUPENiRKr51ZEYQVMtnKUOfldjc2ozJOTVrYJkeqK4f4ziKsOoO+EELfrs7BLyg /sE1R7j010mlZcmQZw/r1wQej2bRtA5mF/ooOzTgGCwS2cl7sIb84vFrkqcFC2H1XVcs bf7w== X-Gm-Message-State: AOAM532zdaUVO+MSldK7GpVDwjSnrLQsdTJiJWfzphuMBsC7I076C7fL xfiQxxdSsb47dsNgDojzAVU= X-Google-Smtp-Source: ABdhPJzITjqOSIEwAgaIe7Ic1rXMNJAekEbaepZ8B4LNaIUWC63Ul7cV5BeIKu5fRvTPGZ4cIoi1Dg== X-Received: by 2002:a2e:b0d5:: with SMTP id g21mr13163485ljl.372.1608063705777; Tue, 15 Dec 2020 12:21:45 -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 f3sm2873711ljp.114.2020.12.15.12.21.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Dec 2020 12:21:45 -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 Cc: linux-tegra@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 1/8] usb: phy: tegra: Add delay after power up Date: Tue, 15 Dec 2020 23:21:06 +0300 Message-Id: <20201215202113.30394-2-digetx@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201215202113.30394-1-digetx@gmail.com> References: <20201215202113.30394-1-digetx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@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 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..cee9c9dbb775 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 to settle down */ + usleep_range(2000, 2500); + return 0; }