From patchwork Wed Mar 30 20:03:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 8703501 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D83B69F44D for ; Wed, 30 Mar 2016 20:11:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0988820361 for ; Wed, 30 Mar 2016 20:11:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 18C9F200E8 for ; Wed, 30 Mar 2016 20:11:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755261AbcC3UFm (ORCPT ); Wed, 30 Mar 2016 16:05:42 -0400 Received: from down.free-electrons.com ([37.187.137.238]:45576 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755326AbcC3UFk (ORCPT ); Wed, 30 Mar 2016 16:05:40 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id B1ACA1BBA; Wed, 30 Mar 2016 22:05:36 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost.localdomain (LFbn-1-2159-240.w90-76.abo.wanadoo.fr [90.76.216.240]) by mail.free-electrons.com (Postfix) with ESMTPSA id E57CA1852; Wed, 30 Mar 2016 22:05:10 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org, Mark Brown , Liam Girdwood , Kamil Debski , lm-sensors@lm-sensors.org, Jean Delvare , Guenter Roeck , Dmitry Torokhov , linux-input@vger.kernel.org, Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, Maxime Ripard , Chen-Yu Tsai , linux-sunxi@googlegroups.com, Joachim Eastwood , Thomas Petazzoni , Heiko Stuebner , linux-rockchip@lists.infradead.org, Jingoo Han , Lee Jones , linux-fbdev@vger.kernel.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Robert Jarzmik , Alexandre Belloni , Kukjin Kim , Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, intel-gfx@lists.freedesktop.org, Daniel Vetter , Jani Nikula , Jonathan Corbet , linux-doc@vger.kernel.org, David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Hartley Sweeten , Ryan Mallon , Alexander Shiyan , Milo Kim , Boris Brezillon Subject: [PATCH v5 30/46] regulator: pwm: retrieve correct voltage Date: Wed, 30 Mar 2016 22:03:53 +0200 Message-Id: <1459368249-13241-31-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> References: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The continuous PWM voltage regulator is caching the voltage value in the ->volt_uV field. While most of the time this value should reflect the real voltage, sometime it can be sightly different if the PWM device rounded the set_duty_cycle request. Moreover, this value is not valid until someone has modified the regulator output. Remove the ->volt_uV field and always rely on the PWM state to calculate the regulator output. Signed-off-by: Boris Brezillon Acked-by: Mark Brown --- drivers/regulator/pwm-regulator.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 9374796..77f42d8 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -35,9 +35,6 @@ struct pwm_regulator_data { struct regulator_ops ops; int state; - - /* Continuous voltage */ - int volt_uV; }; struct pwm_voltages { @@ -167,11 +164,27 @@ static int pwm_voltage_to_duty_cycle_percentage(struct regulator_dev *rdev, int return ((req_uV * 100) - (min_uV * 100)) / diff; } +static int pwm_duty_cycle_percentage_to_voltage(struct regulator_dev *rdev, + int dutycycle) +{ + int min_uV = rdev->constraints->min_uV; + int max_uV = rdev->constraints->max_uV; + int diff = max_uV - min_uV; + + return min_uV + ((diff * dutycycle) / 100); +} + static int pwm_regulator_get_voltage(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pstate; + u64 dutycycle; - return drvdata->volt_uV; + pwm_get_state(drvdata->pwm, &pstate); + dutycycle = pstate.duty_cycle * 100; + do_div(dutycycle, pstate.period); + + return pwm_duty_cycle_percentage_to_voltage(rdev, dutycycle); } static int pwm_regulator_set_voltage(struct regulator_dev *rdev, @@ -196,8 +209,6 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, return ret; } - drvdata->volt_uV = min_uV; - /* Delay required by PWM regulator to settle to the new voltage */ usleep_range(ramp_delay, ramp_delay + 1000);