From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 329B6C47404 for ; Fri, 4 Oct 2019 12:55:18 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F2473222BE for ; Fri, 4 Oct 2019 12:55:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dPClh30q"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=st.com header.i=@st.com header.b="n46SoD5O" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F2473222BE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=st.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PIL25I8Pej+COtZZwvy7bW/6w0Ng41VD7e3YJqDK49c=; b=dPClh30q6LrY5t 9KMHI5JaprTQLZQplSPO2MdunxLIfyBGLKNv8LFtg/zM1yuVfs+QRuIe5p9wfSP0Q3Ew45nchA2rY 24ocPgg29dvNA9+9p6dO2dwfqwvkCUH4wf0xIWmlikQjk+OGEGFGjkGmpWhKk5Ds7eVRMtPK4jumc i35DvmD5F8uicUePwMe68+op7ZUmkzIFlNxm4kiba9AQWDbsexNeAq6qk+5C6rzZtpFwuiJ2SZDLV OotXdEra3JGpSnQLVvdtoxzKcqX27lAWrb6xchXwrEScBgjeM6ilEBjpFVFhW45zET+nNpKmbew2+ VUq9xAZ0K7QLpnIbNhPw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iGN71-0005iv-0Y; Fri, 04 Oct 2019 12:55:11 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iGN6D-0004R9-0F for linux-arm-kernel@lists.infradead.org; Fri, 04 Oct 2019 12:54:23 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id x94CpoxJ005820; Fri, 4 Oct 2019 14:54:13 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=V4v+lFYFEXdiVbvoBk7RFLUjPo+9SumQd8cGnXWqUig=; b=n46SoD5OaCtB0jdEACL7bSdbzu3jsBBqziQagzYHPtuhePEOqX5S9qnm33QRU5Mr/PSh YOsuRb38HIoDY/F/rgg4tupzfVYvDaWzaXhD3GAicU47fNchcDESni+DQf9iWY64CUOD kaFRvzFuvvISlqnDVemx4aDyfdb9XYv85Iqt82q3qAYjua28+iUfABacQwxFCZWB+6+/ lXaqLqWfWq99OGljZnoTS6tXR0rQ7X2ItcMT+GFTzOHFA8KCZispgpFJ52jlfmTavkx6 U6+KbYHxBNV6iVVEFYdVF7nGJ4AnvQPulCyLzlwDC5gz8CBIxjgpN5ique6diVrKDld8 8Q== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2v9xdhapkk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 04 Oct 2019 14:54:13 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 3E51A10002A; Fri, 4 Oct 2019 14:54:13 +0200 (CEST) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 3054A2BFDEF; Fri, 4 Oct 2019 14:54:13 +0200 (CEST) Received: from SAFEX1HUBCAS22.st.com (10.75.90.92) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.439.0; Fri, 4 Oct 2019 14:54:13 +0200 Received: from localhost (10.48.0.192) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.439.0; Fri, 4 Oct 2019 14:54:12 +0200 From: Fabrice Gasnier To: , , Subject: [PATCH v2 3/3] pwm: stm32: add power management support Date: Fri, 4 Oct 2019 14:53:53 +0200 Message-ID: <1570193633-6600-4-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1570193633-6600-1-git-send-email-fabrice.gasnier@st.com> References: <1570193633-6600-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.48.0.192] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-10-04_06:2019-10-03,2019-10-04 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191004_055421_337294_8DC49E46 X-CRM114-Status: GOOD ( 17.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, alexandre.torgue@st.com, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, mcoquelin.stm32@gmail.com, fabrice.gasnier@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, benjamin.gaignard@st.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add suspend/resume PM sleep ops. When going to low power, enforce the PWM channel isn't active. Let the PWM consumers disable it during their own suspend sequence, see [1]. So, perform a check here, and handle the pinctrl states. Also restore the break inputs upon resume, as registers content may be lost when going to low power mode. [1] https://lkml.org/lkml/2019/2/5/770 Signed-off-by: Fabrice Gasnier --- Changes in v2: Follow Uwe suggestions/remarks: - Add a precursor patch to ease reviewing - Use registers read instead of pwm_get_state - Add a comment to mention registers content may be lost in low power mode --- drivers/pwm/pwm-stm32.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index cf8658c..546b661 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -655,6 +656,42 @@ static int stm32_pwm_remove(struct platform_device *pdev) return 0; } +static int __maybe_unused stm32_pwm_suspend(struct device *dev) +{ + struct stm32_pwm *priv = dev_get_drvdata(dev); + unsigned int ch; + u32 ccer, mask; + + /* Look for active channels */ + ccer = active_channels(priv); + + for (ch = 0; ch < priv->chip.npwm; ch++) { + mask = TIM_CCER_CC1E << (ch * 4); + if (ccer & mask) { + dev_err(dev, "The consumer didn't stop us (%s)\n", + priv->chip.pwms[ch].label); + return -EBUSY; + } + } + + return pinctrl_pm_select_sleep_state(dev); +} + +static int __maybe_unused stm32_pwm_resume(struct device *dev) +{ + struct stm32_pwm *priv = dev_get_drvdata(dev); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + /* restore breakinput registers that may have been lost in low power */ + return stm32_pwm_apply_breakinputs(priv); +} + +static SIMPLE_DEV_PM_OPS(stm32_pwm_pm_ops, stm32_pwm_suspend, stm32_pwm_resume); + static const struct of_device_id stm32_pwm_of_match[] = { { .compatible = "st,stm32-pwm", }, { /* end node */ }, @@ -667,6 +704,7 @@ static struct platform_driver stm32_pwm_driver = { .driver = { .name = "stm32-pwm", .of_match_table = stm32_pwm_of_match, + .pm = &stm32_pwm_pm_ops, }, }; module_platform_driver(stm32_pwm_driver); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel