From patchwork Tue May 3 09:33:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 9001281 Return-Path: X-Original-To: patchwork-linux-rockchip@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1E20EBF29F for ; Tue, 3 May 2016 09:34:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1152D2025A for ; Tue, 3 May 2016 09:34:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E642D20253 for ; Tue, 3 May 2016 09:34:39 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1axWj1-0000DR-L5; Tue, 03 May 2016 09:34:39 +0000 Received: from mail-pa0-f68.google.com ([209.85.220.68]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1axWiy-00009A-S8 for linux-rockchip@lists.infradead.org; Tue, 03 May 2016 09:34:37 +0000 Received: by mail-pa0-f68.google.com with SMTP id i5so1075943pag.3 for ; Tue, 03 May 2016 02:34:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=QRUb/EPx0d4ca3gUXmyQVgnhyulTCghpnoFW5n3acLo=; b=LuS7N2TAtDxq6RoSjq/4Yqruagciz0lMSnJOAIhKY4Sh9pCq5zZ99hvp5xJlsiS/xF ECYnUAd0/xAHfDC5Y5+PM/8Iz62ZUdfwsrO/nSJ6ZBcTyFPtw/jjTJG+Sq6UGciZtTjI Qtkkf//Wg/WYIa/N5spkxSYR58w8pwt+zZ/rjfTWQzXgHdD9WuTaFaRtAK1MG3iWPZcT fuHjdVTRBNzlx8EActcFBuOTVpXLekuT8AF26eVzxhtw0+6hjttCpiPwplnIhR6Nwa/f jfgdJqbmfrK/WLc+rVuDugHu1JPHKuTEyOCP33FqQ+qJkFginTgwRyBS5Fu4HLKbBXUO Hh4Q== X-Gm-Message-State: AOPr4FUIE5B2o0grnyzoydyEtHpvp2/NNrwc1WnIzt7iUTxb190tA7WxK3OLdsol7hX5vQ== X-Received: by 10.66.166.78 with SMTP id ze14mr1871140pab.149.1462268056068; Tue, 03 May 2016 02:34:16 -0700 (PDT) Received: from localhost.localdomain ([104.37.5.210]) by smtp.gmail.com with ESMTPSA id f16sm4201829pfj.71.2016.05.03.02.34.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 03 May 2016 02:34:14 -0700 (PDT) From: Caesar Wang To: edubezval@gmail.com Subject: [PATCH v2 1/5] thermal: Add support for hardware-tracked trip points Date: Tue, 3 May 2016 17:33:29 +0800 Message-Id: <1462268013-14992-2-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1462268013-14992-1-git-send-email-wxt@rock-chips.com> References: <1462268013-14992-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160503_023436_996905_09B33E00 X-CRM114-Status: GOOD ( 21.69 ) X-Spam-Score: -2.4 (--) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: huangtao@rock-chips.com, Jonathan Corbet , Javi Merino , Durgadoss R , Heiko Stuebner , linux-pm@vger.kernel.org, Sascha Hauer , dmitry.torokhov@gmail.com, linux-doc@vger.kernel.org, dianders@chromium.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Laxman Dewangan , smbarber@google.com, Ni Wade , Leo Yan , cf@rock-chips.com, briannorris@google.com, Zhang Rui , Andy Champ , Caesar Wang MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, 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 From: Sascha Hauer This adds support for hardware-tracked trip points to the device tree thermal sensor framework. The framework supports an arbitrary number of trip points. Whenever the current temperature is updated, the trip points immediately below and above the current temperature are found. A .set_trips callback is then called with the temperatures. If there is no trip point above or below the current temperature, the passed trip temperature will be -INT_MAX or INT_MAX respectively. In this callback, the driver should program the hardware such that it is notified when either of these trip points are triggered. When a trip point is triggered, the driver should call `thermal_zone_device_update' for the respective thermal zone. This will cause the trip points to be updated again. If .set_trips is not implemented, the framework behaves as before. This patch is based on an earlier version from Mikko Perttunen Signed-off-by: Sascha Hauer Signed-off-by: Caesar Wang Cc: Zhang Rui Cc: Eduardo Valentin Cc: linux-pm@vger.kernel.org --- Changes in v2: - update the sysfs-api.txt for set_trips Documentation/thermal/sysfs-api.txt | 7 +++++ drivers/thermal/thermal_core.c | 52 +++++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 3 +++ 3 files changed, 62 insertions(+) diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index efc3f3d..75d8838 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -49,6 +49,9 @@ temperature) and throttle appropriate devices. .bind: bind the thermal zone device with a thermal cooling device. .unbind: unbind the thermal zone device with a thermal cooling device. .get_temp: get the current temperature of the thermal zone. + .set_trips: set the trip points window. Whenever the current temperature + is updated, the trip points immediately below and above the + current temperature are found. .get_mode: get the current mode (enabled/disabled) of the thermal zone. - "enabled" means the kernel thermal management is enabled. - "disabled" will prevent kernel thermal driver action upon trip points @@ -95,6 +98,10 @@ temperature) and throttle appropriate devices. get_temp: a pointer to a function that reads the sensor temperature. This is mandatory callback provided by sensor driver. + set_trips: a pointer to a function that sets a + temperature window. When this window is + left the driver must inform the thermal + core via thermal_zone_device_update. get_trend: a pointer to a function that reads the sensor temperature trend. set_emul_temp: a pointer to a function that sets diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 5133cd1..e5bfbd3 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -520,6 +520,51 @@ exit: } EXPORT_SYMBOL_GPL(thermal_zone_get_temp); +static void thermal_zone_set_trips(struct thermal_zone_device *tz) +{ + int low = -INT_MAX; + int high = INT_MAX; + int trip_temp, hysteresis; + int temp = tz->temperature; + int i, ret; + + if (!tz->ops->set_trips) + return; + + for (i = 0; i < tz->trips; i++) { + int trip_low; + + tz->ops->get_trip_temp(tz, i, &trip_temp); + tz->ops->get_trip_hyst(tz, i, &hysteresis); + + trip_low = trip_temp - hysteresis; + + if (trip_low < temp && trip_low > low) + low = trip_low; + + if (trip_temp > temp && trip_temp < high) + high = trip_temp; + } + + /* No need to change trip points */ + if (tz->prev_low_trip == low && tz->prev_high_trip == high) + return; + + tz->prev_low_trip = low; + tz->prev_high_trip = high; + + dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n", + low, high); + + /* + * Set a temperature window. When this window is left the driver + * must inform the thermal core via thermal_zone_device_update. + */ + ret = tz->ops->set_trips(tz, low, high); + if (ret) + dev_err(&tz->device, "Failed to set trips: %d\n", ret); +} + static void update_temperature(struct thermal_zone_device *tz) { int temp, ret; @@ -569,6 +614,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) update_temperature(tz); + thermal_zone_set_trips(tz); + for (count = 0; count < tz->trips; count++) handle_thermal_trip(tz, count); } @@ -754,6 +801,9 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr, */ ret = tz->ops->set_trip_hyst(tz, trip, temperature); + if (!ret) + thermal_zone_set_trips(tz); + return ret ? ret : count; } @@ -1843,6 +1893,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, tz->trips = trips; tz->passive_delay = passive_delay; tz->polling_delay = polling_delay; + tz->prev_low_trip = INT_MAX; + tz->prev_high_trip = -INT_MAX; /* A new thermal zone needs to be updated anyway. */ atomic_set(&tz->need_update, 1); diff --git a/include/linux/thermal.h b/include/linux/thermal.h index e45abe7..e258359 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -98,6 +98,7 @@ struct thermal_zone_device_ops { int (*unbind) (struct thermal_zone_device *, struct thermal_cooling_device *); int (*get_temp) (struct thermal_zone_device *, int *); + int (*set_trips) (struct thermal_zone_device *, int, int); int (*get_mode) (struct thermal_zone_device *, enum thermal_device_mode *); int (*set_mode) (struct thermal_zone_device *, @@ -199,6 +200,8 @@ struct thermal_zone_device { int last_temperature; int emul_temperature; int passive; + int prev_low_trip; + int prev_high_trip; unsigned int forced_passive; atomic_t need_update; struct thermal_zone_device_ops *ops;