From patchwork Wed Jul 9 10:01:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Gautam X-Patchwork-Id: 4513001 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E7683BEEAA for ; Wed, 9 Jul 2014 10:03:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0E342202E5 for ; Wed, 9 Jul 2014 10:03:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D1B43202B4 for ; Wed, 9 Jul 2014 10:03:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755193AbaGIKBw (ORCPT ); Wed, 9 Jul 2014 06:01:52 -0400 Received: from mail-pd0-f170.google.com ([209.85.192.170]:41092 "EHLO mail-pd0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755270AbaGIKBu (ORCPT ); Wed, 9 Jul 2014 06:01:50 -0400 Received: by mail-pd0-f170.google.com with SMTP id z10so8806052pdj.1 for ; Wed, 09 Jul 2014 03:01:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=Bc1HFDaCD14bMv5tHgabEHnRTCndzVhcT5aIoZaNI6g=; b=XZxbLKNOivjTAEoPd/zWoM1JJ+xKg+sI0tc9PYctljlpHXfXO6JUBJMPLEeozXI05i 7qizD/YXPxuEXVpasACctOptAW8yHikl6HbKb0/1kqeTYcWTqKt7K8KTyDmDlnJG/hSv 1HufEBeUnkIr1qqnx5S0opqgtqSNToNgDOJVHHYsNqXoI+/mOYIor0fG3Ejh30srBAUp 4XRCUESFvg6YEzphVAiWPF0LkSj0RSODJ5WPZSKmkngVsokH7BRBb0lMIr7lAZU3i3QA 61tROKZy4fcY1hxFuWE4B6IFTSGR0+pRKkQj7Xuhvi5g9Kp4wlclMz4tNpSAXGIFOY9D N8Og== X-Received: by 10.66.65.138 with SMTP id x10mr11000702pas.17.1404900109889; Wed, 09 Jul 2014 03:01:49 -0700 (PDT) Received: from vivek-linuxpc.sisodomain.com ([14.140.216.146]) by mx.google.com with ESMTPSA id co3sm58341286pbb.89.2014.07.09.03.01.45 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 09 Jul 2014 03:01:49 -0700 (PDT) From: Vivek Gautam To: linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, kishon@ti.com, kgene.kim@samsung.com, mathias.nyman@intel.com, jwerner@chromium.org, sergei.shtylyov@cogentembedded.com, heikki.krogerus@linux.intel.com, pratyush.anand@st.com, Vivek Gautam Subject: [PATCH v2 1/4] phy: Add provision for calibrating phy. Date: Wed, 9 Jul 2014 15:31:33 +0530 Message-Id: <1404900096-1721-2-git-send-email-gautam.vivek@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1404900096-1721-1-git-send-email-gautam.vivek@samsung.com> References: <1404900096-1721-1-git-send-email-gautam.vivek@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some PHY controllers may need to calibrate certain PHY settings after initialization of the controller and sometimes even after initializing the PHY-consumer too. Add support for the same in order to let consumers do so in need. Signed-off-by: vivek Gautam --- drivers/phy/phy-core.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/phy/phy.h | 8 ++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c index 74d4346..92d31a3 100644 --- a/drivers/phy/phy-core.c +++ b/drivers/phy/phy-core.c @@ -376,6 +376,42 @@ int phy_power_off(struct phy *phy) EXPORT_SYMBOL_GPL(phy_power_off); /** + * phy_calibrate - calibrate a phy post initialization + * @phy: Pointer to 'phy' from consumer + * + * For certain PHYs, it may be needed to calibrate few phy parameters + * post initialization. The need to calibrate may arise after the + * initialization of consumer itself, in order to prevent further any + * loss of phy settings post consumer-initialization. + * example: USB 3.0 DRD PHY on Exynos5420/5800 systems is one such + * phy which needs calibration after the host controller reset + * has happened. + */ +int phy_calibrate(struct phy *phy) +{ + int ret = -ENOTSUPP; + + if (!phy) + return 0; + + mutex_lock(&phy->mutex); + if (phy->ops->calibrate) { + ret = phy->ops->calibrate(phy); + if (ret < 0) { + dev_err(&phy->dev, + "phy calibration failed --> %d\n", ret); + goto out; + } + } + +out: + mutex_unlock(&phy->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(phy_calibrate); + +/** * _of_phy_get() - lookup and obtain a reference to a phy by phandle * @np: device_node for which to get the phy * @index: the index of the phy diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h index 5a537a5..b7f33ee 100644 --- a/include/linux/phy/phy.h +++ b/include/linux/phy/phy.h @@ -27,6 +27,7 @@ struct phy; * @exit: operation to be performed while exiting * @power_on: powering on the phy * @power_off: powering off the phy + * @calibrate: calibrate the phy post init * @owner: the module owner containing the ops */ struct phy_ops { @@ -34,6 +35,7 @@ struct phy_ops { int (*exit)(struct phy *phy); int (*power_on)(struct phy *phy); int (*power_off)(struct phy *phy); + int (*calibrate)(struct phy *phy); struct module *owner; }; @@ -124,6 +126,7 @@ int phy_init(struct phy *phy); int phy_exit(struct phy *phy); int phy_power_on(struct phy *phy); int phy_power_off(struct phy *phy); +int phy_calibrate(struct phy *phy); static inline int phy_get_bus_width(struct phy *phy) { return phy->attrs.bus_width; @@ -227,6 +230,11 @@ static inline int phy_power_off(struct phy *phy) return -ENOSYS; } +static inline int phy_calibrate(struct phy *phy) +{ + return -ENOSYS; +} + static inline int phy_get_bus_width(struct phy *phy) { return -ENOSYS;