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=ham 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 03F65C32792 for ; Thu, 3 Oct 2019 16:10:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCDED21848 for ; Thu, 3 Oct 2019 16:10:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570119044; bh=hl3O/OFJLRd7pyM5aEktlYIQgT6hixGXy1W4f3nfxMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h41zHu/lFzns+dQaovNnmBscl4jKpd5konEIqbKLFX4GxaDe0HFT5+H3AzTFU17py DJRrQb+R6rfoYpad6Eiu2CFqwjikD6I4WguJ1EIrCdwOkdVoI6cboB9a/ZH1eMlUy9 6hx0zioYZIxkF9E/hvP2b3612bUCawml2c9QXYmI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732416AbfJCQKo (ORCPT ); Thu, 3 Oct 2019 12:10:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:60240 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387702AbfJCQKn (ORCPT ); Thu, 3 Oct 2019 12:10:43 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D16A220865; Thu, 3 Oct 2019 16:10:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570119042; bh=hl3O/OFJLRd7pyM5aEktlYIQgT6hixGXy1W4f3nfxMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wvzdcvXenZpyb/gOQhNTPTqGmsclGN0Z8+r1zrIK3O42RJmvVv7I4FUy/JmWeO/0F TyTfOB6bzB1n6xIF9aMPRPnpGcgfdkTCOJgAnnbPnHbEIfgOXTFUFgC5vf+naxYmD0 tCyz+AI3yyPJJ8jMSaOf7RmjswNP1q3i5crV5B7I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kamil Konieczny , Chanwoo Choi , MyungJoo Ham , Sasha Levin Subject: [PATCH 4.14 104/185] PM / devfreq: exynos-bus: Correct clock enable sequence Date: Thu, 3 Oct 2019 17:53:02 +0200 Message-Id: <20191003154502.348273629@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154437.541662648@linuxfoundation.org> References: <20191003154437.541662648@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kamil Konieczny [ Upstream commit 2c2b20e0da89c76759ee28c6824413ab2fa3bfc6 ] Regulators should be enabled before clocks to avoid h/w hang. This require change in exynos_bus_probe() to move exynos_bus_parse_of() after exynos_bus_parent_parse_of() and change in error handling. Similar change is needed in exynos_bus_exit() where clock should be disabled before regulators. Signed-off-by: Kamil Konieczny Acked-by: Chanwoo Choi Signed-off-by: MyungJoo Ham Signed-off-by: Sasha Levin --- drivers/devfreq/exynos-bus.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c index 49f68929e024f..25ff31eb1044c 100644 --- a/drivers/devfreq/exynos-bus.c +++ b/drivers/devfreq/exynos-bus.c @@ -194,11 +194,10 @@ static void exynos_bus_exit(struct device *dev) if (ret < 0) dev_warn(dev, "failed to disable the devfreq-event devices\n"); - if (bus->regulator) - regulator_disable(bus->regulator); - dev_pm_opp_of_remove_table(dev); clk_disable_unprepare(bus->clk); + if (bus->regulator) + regulator_disable(bus->regulator); } /* @@ -386,6 +385,7 @@ static int exynos_bus_probe(struct platform_device *pdev) struct exynos_bus *bus; int ret, max_state; unsigned long min_freq, max_freq; + bool passive = false; if (!np) { dev_err(dev, "failed to find devicetree node\n"); @@ -399,27 +399,27 @@ static int exynos_bus_probe(struct platform_device *pdev) bus->dev = &pdev->dev; platform_set_drvdata(pdev, bus); - /* Parse the device-tree to get the resource information */ - ret = exynos_bus_parse_of(np, bus); - if (ret < 0) - return ret; - profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL); - if (!profile) { - ret = -ENOMEM; - goto err; - } + if (!profile) + return -ENOMEM; node = of_parse_phandle(dev->of_node, "devfreq", 0); if (node) { of_node_put(node); - goto passive; + passive = true; } else { ret = exynos_bus_parent_parse_of(np, bus); + if (ret < 0) + return ret; } + /* Parse the device-tree to get the resource information */ + ret = exynos_bus_parse_of(np, bus); if (ret < 0) - goto err; + goto err_reg; + + if (passive) + goto passive; /* Initialize the struct profile and governor data for parent device */ profile->polling_ms = 50; @@ -509,6 +509,9 @@ static int exynos_bus_probe(struct platform_device *pdev) err: dev_pm_opp_of_remove_table(dev); clk_disable_unprepare(bus->clk); +err_reg: + if (!passive) + regulator_disable(bus->regulator); return ret; } -- 2.20.1