From patchwork Wed Mar 30 20:03:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 8706711 Return-Path: X-Original-To: patchwork-dri-devel@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 C3119C0553 for ; Thu, 31 Mar 2016 00:51:01 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D561820383 for ; Thu, 31 Mar 2016 00:51:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id CA18820374 for ; Thu, 31 Mar 2016 00:50:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4E5756E92D; Thu, 31 Mar 2016 00:50:30 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.free-electrons.com (down.free-electrons.com [37.187.137.238]) by gabe.freedesktop.org (Postfix) with ESMTP id EA2A46E8A9; Wed, 30 Mar 2016 20:05:32 +0000 (UTC) Received: by mail.free-electrons.com (Postfix, from userid 110) id AD1961836; Wed, 30 Mar 2016 22:05:31 +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=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 2AB61184B; Wed, 30 Mar 2016 22:05:04 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Subject: [PATCH v5 27/46] regulator: pwm: adjust PWM config at probe time Date: Wed, 30 Mar 2016 22:03:50 +0200 Message-Id: <1459368249-13241-28-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> X-Mailman-Approved-At: Thu, 31 Mar 2016 00:47:56 +0000 Cc: Milo Kim , Kamil Debski , linux-doc@vger.kernel.org, Mike Turquette , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, Alexandre Belloni , Daniel Vetter , Lee Jones , linux-clk@vger.kernel.org, linux-leds@vger.kernel.org, Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, Alexander Shiyan , Jonathan Corbet , Robert Jarzmik , lm-sensors@lm-sensors.org, linux-rockchip@lists.infradead.org, Chen-Yu Tsai , Tomi Valkeinen , linux-input@vger.kernel.org, Jean-Christophe Plagniol-Villard , intel-gfx@lists.freedesktop.org, Guenter Roeck , Jean Delvare , Joachim Eastwood , Bryan Wu , Mark Brown , Jacek Anaszewski , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , Ryan Mallon , Jingoo Han , Dmitry Torokhov , Stephen Boyd , Liam Girdwood , Hartley Sweeten , Richard Purdie , Kukjin Kim , Maxime Ripard X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The PWM attached to a PWM regulator device might have been previously configured by the bootloader. Make sure the bootloader and linux config are in sync, and adjust the PWM config if that's not the case. Signed-off-by: Boris Brezillon --- drivers/regulator/pwm-regulator.c | 50 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 9154c47..9590fb0 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -240,6 +240,52 @@ static int pwm_regulator_init_continuous(struct platform_device *pdev, return 0; } +static int pwm_regulator_adjust_pwm_config(struct pwm_regulator_data *drvdata) +{ + struct pwm_state pstate = { }; + struct pwm_args pargs = { }; + + pwm_get_args(drvdata->pwm, &pargs); + pwm_get_state(drvdata->pwm, &pstate); + + /* + * if the current period is zero this either means the PWM driver + * does not support initial state retrieval or the PWM was not + * configured. + * In any case, we setup the new period and poloarity, and assign a + * duty_cycle of 0. + */ + if (!pstate.period) { + pstate.duty_cycle = 0; + pstate.period = pargs.period; + pstate.polarity = pargs.polarity; + + return pwm_apply_state(drvdata->pwm, &pstate); + } + + /* + * Adjust the PWM dutycycle/period based on the period value provided + * in PWM args. + */ + if (pargs.period != pstate.period) { + u64 dutycycle = (u64)pstate.duty_cycle * pargs.period; + + do_div(dutycycle, pstate.period); + pstate.duty_cycle = dutycycle; + pstate.period = pargs.period; + } + + /* + * If the polarity changed, we should also change the dutycycle value. + */ + if (pargs.polarity != pstate.polarity) { + pstate.polarity = pargs.polarity; + pstate.duty_cycle = pstate.period - pstate.duty_cycle; + } + + return pwm_apply_state(drvdata->pwm, &pstate); +} + static int pwm_regulator_probe(struct platform_device *pdev) { const struct regulator_init_data *init_data; @@ -283,6 +329,10 @@ static int pwm_regulator_probe(struct platform_device *pdev) return PTR_ERR(drvdata->pwm); } + ret = pwm_regulator_adjust_pwm_config(drvdata); + if (ret) + return ret; + regulator = devm_regulator_register(&pdev->dev, &drvdata->desc, &config); if (IS_ERR(regulator)) {