From patchwork Wed Oct 26 10:13:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 1694870 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=o2dclP6T; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4My4QM4rh7z20S2 for ; Wed, 26 Oct 2022 21:13:31 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231877AbiJZKN3 (ORCPT ); Wed, 26 Oct 2022 06:13:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231706AbiJZKN2 (ORCPT ); Wed, 26 Oct 2022 06:13:28 -0400 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2084.outbound.protection.outlook.com [40.107.223.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B43D9CE2D; Wed, 26 Oct 2022 03:13:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Iku/frUeTrlKdIP2ZEsFnhPqdR/5qviqbHL0fS0ftci2esJlYcrVGaz0girEnaJuHuglko3GaFS0P+P68c86plcak7vmVEvdBY3jUhAKBGVH4mqkoFmXzJwqspmHkmKZRu0Or1SoQpYw/l1Itmuh5EkLAtPiSFjO82Z6G9OrOw6ARDToaRD0RfD5P4pNweNxuYLvoNSiCh3Gr1/kStOqqoUIea/ZdZGSyBNKPABhI/GHCRNgj0dmg2y9mz+EQ1lpT3Sx+5eCzRE/bP4ozvHgzsiNG3ciCBVM8cgr4HUyOrgL2gL59ctAax1n2AtPAc0x3hs9/0qyxYowVq9xIwBUdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Fjf8HerWatKfxdEDcdH4yB+7hO9HdkeTb8mnp2Y/LeI=; b=oeUeOXjCd7gmwTVq+OtNZtZhMla++Pv7gpPngX8iBzc84gijatC2MuCtBSfNKtSDxlnYxGeErTvQrcr0YJhBzrRdvzoWFq24dPBnyYfcv16dJNHOEBDLnPePJSWVJLabSJwR16WCupjyyQYwtPeI3EdcC3QH0H6/8JafI62fBuJ4uMT9gK5UoN7HzzBIn+4JpvYoHPtGsNf5WivdNU2p+EAAb0M4E7NTnoT8YcwAUTkA2IPy1TBrOsmN7lOaRS7avWstEmWbFV6rYG4CHYH9wHEasAeDrAc8xaQaR8y5XYFahLP1wFf1SmK/OOl61BpY9S9wjgTD8mKcVypPza6L0w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.161) smtp.rcpttodomain=gmail.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Fjf8HerWatKfxdEDcdH4yB+7hO9HdkeTb8mnp2Y/LeI=; b=o2dclP6T8R5VvOvZP672SIcTlmNJqKbqLUEAY7A8PAVZWJivc+xOcfXj6OfWYdg0eFSgaH01dcZYuSY8ekcrtWPuHINoIx2SJbJ5Qxx1s/Jj0BmBQz5gSl+CZNfHU7ZqT3o+ghgadY7sJXq5PSz1uiVcAuwADvPoxbRd/gw0Ujw7qyTiu3chJeGHu4e3AblJqErt1jx9QL4x1mnSsklcu6J07MXlvUOhJCYX8OsjTUyAzKTAYaL7LNohZvVZRc+GkgsnBiwY6wE1cxz99O5uRk7xbwBR1tU2AI9il/umGD2glmHQzkPaNH0qH+e+soFOntGUkdM0V5JIOcE4h5rkTQ== Received: from MW4PR04CA0044.namprd04.prod.outlook.com (2603:10b6:303:6a::19) by PH8PR12MB6915.namprd12.prod.outlook.com (2603:10b6:510:1bc::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28; Wed, 26 Oct 2022 10:13:26 +0000 Received: from CO1NAM11FT088.eop-nam11.prod.protection.outlook.com (2603:10b6:303:6a:cafe::6c) by MW4PR04CA0044.outlook.office365.com (2603:10b6:303:6a::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28 via Frontend Transport; Wed, 26 Oct 2022 10:13:26 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.161) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by CO1NAM11FT088.mail.protection.outlook.com (10.13.175.131) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.16 via Frontend Transport; Wed, 26 Oct 2022 10:13:25 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.26; Wed, 26 Oct 2022 03:13:17 -0700 Received: from rnnvmail202.nvidia.com (10.129.68.7) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Wed, 26 Oct 2022 03:13:17 -0700 Received: from moonraker.home (10.127.8.14) by mail.nvidia.com (10.129.68.7) with Microsoft SMTP Server id 15.2.986.29 via Frontend Transport; Wed, 26 Oct 2022 03:13:15 -0700 From: Jon Hunter To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= CC: , , Jon Hunter Subject: [PATCH 1/2] pwm: tegra: Improve required rate calculation Date: Wed, 26 Oct 2022 11:13:04 +0100 Message-ID: <20221026101305.30670-1-jonathanh@nvidia.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-NVConfidentiality: public X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT088:EE_|PH8PR12MB6915:EE_ X-MS-Office365-Filtering-Correlation-Id: 11dd3eab-52d6-456b-cc3c-08dab73ab8b0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(396003)(346002)(39860400002)(376002)(136003)(451199015)(46966006)(36840700001)(40470700004)(40460700003)(41300700001)(2906002)(186003)(1076003)(26005)(83380400001)(356005)(336012)(2616005)(36756003)(7636003)(82740400003)(47076005)(426003)(8936002)(82310400005)(5660300002)(478600001)(40480700001)(107886003)(6666004)(86362001)(36860700001)(8676002)(4326008)(70206006)(70586007)(316002)(54906003)(110136005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 10:13:25.9364 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 11dd3eab-52d6-456b-cc3c-08dab73ab8b0 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT088.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6915 X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org For the case where dev_pm_opp_set_rate() is called to set the PWM clock rate, the requested rate is calculated as ... required_clk_rate = (NSEC_PER_SEC / period_ns) << PWM_DUTY_WIDTH; The above calculation may lead to rounding errors because the NSEC_PER_SEC is divided by 'period_ns' before applying the PWM_DUTY_WIDTH multiplication factor. For example, if the period is 45334ns, the above calculation yields a rate of 5646848Hz instead of 5646976Hz. Fix this by applying the multiplication factor before dividing and using the DIV_ROUND_UP macro which yields the expected result of 5646976Hz. Fixes: 1d7796bdb63a ("pwm: tegra: Support dynamic clock frequency configuration") Signed-off-by: Jon Hunter Reviewed-by: Uwe Kleine-König --- drivers/pwm/pwm-tegra.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c index dad9978c9186..8a33c500f93b 100644 --- a/drivers/pwm/pwm-tegra.c +++ b/drivers/pwm/pwm-tegra.c @@ -145,8 +145,8 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * source clock rate as required_clk_rate, PWM controller will * be able to configure the requested period. */ - required_clk_rate = - (NSEC_PER_SEC / period_ns) << PWM_DUTY_WIDTH; + required_clk_rate = DIV_ROUND_UP_ULL((NSEC_PER_SEC << PWM_DUTY_WIDTH), + period_ns); err = dev_pm_opp_set_rate(pc->dev, required_clk_rate); if (err < 0) From patchwork Wed Oct 26 10:13:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 1694871 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=pinoDzYg; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4My4QT1kXkz1ygr for ; Wed, 26 Oct 2022 21:13:37 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233119AbiJZKNf (ORCPT ); Wed, 26 Oct 2022 06:13:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233096AbiJZKNe (ORCPT ); Wed, 26 Oct 2022 06:13:34 -0400 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2048.outbound.protection.outlook.com [40.107.223.48]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F29DD95E44; Wed, 26 Oct 2022 03:13:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=OXfrPpBQII4zbh6prCjrHfH8wTvOBGaPpgCUzCvl9RLnL7tLJMSK0v34IIO5XE1Sera+8btwgNk+WrXobOBOWIB5YHPCn2U2yzZBX8cvGu9l0bZz530+ei8ujwJO+ePUzv7TBG3JRdzoqjyf7Aea1wqa5/KrCo41kDJBXnkKH1PfTLQAaTiuJ7GdkswT+JkYkYaGVic/4Gr3KpzPQGLJy6gGgDTL8yTqzOXCNC+EvD3jDjwZZUzhI7GCDnvOEITkGWGpQmCRW22Q3ArlPpTpwvIt2c+5apF+Y8bNVMAG2cNppH18yux5qqzZjp2ghpgjjgRNLBY3dTxo+lZpV0y9OA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Zho1N5Ybe25hDM2yJysuIqe3dbizTlMV5GBZkuzeHNM=; b=Cf9upWMRJArw8h20vuZofdWapVj6ZRuUcTg8r6JYFyWiqLrD22CZtDSUTEZJe2017Cidu7eCHdPY7pK+BYJreFYcjhCuewI9qnyZdRNedfM2XjOxIsRvSvB78E7bWsHsleGAKkUEt+MyIiCgTojR1uVAB7nuDNvtiolWsuT+UDqW+TIznLjG9VhQl1URgDgM0auBKeO1aVctQFiN8iRZjUvqSmBKQ+ojICQdp0YMlOvbKtcBiQNNFjs156F9k/qtzqa2+RPqA1eZYuTqpjjKYsaJjxEJ4RNEWF2Aqjodxf2xzsy5DgpSrWYuQxwIqgkhnvQye7yNC2xv9oFWlb4HCQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) smtp.rcpttodomain=gmail.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Zho1N5Ybe25hDM2yJysuIqe3dbizTlMV5GBZkuzeHNM=; b=pinoDzYgwlm3kwXA7fn2Hy+/PjKceMNFPBtCFb//UXz/c41ZjEWoDivxeDC/NY4bvgsKWS2PETxFrt/RHReRBY1e04vv5g7iVLyOClbrKmc+hdAeSovJqbhRE2MLZZCl/r2EZwd4ZPl6It+AZzzL0TXlwpTC0v8TH0Fdy06II8JqIxm501l7ExGodsqfXJhiJbsStqjSxJRfy5djvTxGMvBJruHdxlewl9Qm+Clkw3D4mIDruFEIGBnec57nGtteqql9dugXnJWnZBaf3b3Z8W+HKK2xbhwjgPNvuQbvMdXODh8LUe6g0o0dxGLgzKiObWRfL8Ai+AL0IIk3+Po0+A== Received: from BN0PR03CA0051.namprd03.prod.outlook.com (2603:10b6:408:e7::26) by CY8PR12MB7563.namprd12.prod.outlook.com (2603:10b6:930:96::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28; Wed, 26 Oct 2022 10:13:31 +0000 Received: from BN8NAM11FT039.eop-nam11.prod.protection.outlook.com (2603:10b6:408:e7:cafe::6c) by BN0PR03CA0051.outlook.office365.com (2603:10b6:408:e7::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28 via Frontend Transport; Wed, 26 Oct 2022 10:13:31 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.160) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by BN8NAM11FT039.mail.protection.outlook.com (10.13.177.169) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.16 via Frontend Transport; Wed, 26 Oct 2022 10:13:31 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.26; Wed, 26 Oct 2022 03:13:19 -0700 Received: from rnnvmail202.nvidia.com (10.129.68.7) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Wed, 26 Oct 2022 03:13:18 -0700 Received: from moonraker.home (10.127.8.14) by mail.nvidia.com (10.129.68.7) with Microsoft SMTP Server id 15.2.986.29 via Frontend Transport; Wed, 26 Oct 2022 03:13:17 -0700 From: Jon Hunter To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= CC: , , Jon Hunter Subject: [PATCH 2/2] pwm: tegra: Fix required rate when clock is lower than needed Date: Wed, 26 Oct 2022 11:13:05 +0100 Message-ID: <20221026101305.30670-2-jonathanh@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221026101305.30670-1-jonathanh@nvidia.com> References: <20221026101305.30670-1-jonathanh@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT039:EE_|CY8PR12MB7563:EE_ X-MS-Office365-Filtering-Correlation-Id: 69cbafc8-53d5-4168-be6e-08dab73abbc5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(346002)(376002)(396003)(136003)(39860400002)(451199015)(40470700004)(36840700001)(46966006)(47076005)(426003)(83380400001)(86362001)(70206006)(36860700001)(356005)(82740400003)(5660300002)(8936002)(70586007)(4326008)(6666004)(82310400005)(8676002)(40480700001)(107886003)(26005)(2616005)(40460700003)(54906003)(41300700001)(110136005)(2906002)(336012)(186003)(316002)(7636003)(36756003)(478600001)(1076003)(20673002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 10:13:31.0756 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 69cbafc8-53d5-4168-be6e-08dab73abbc5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT039.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7563 X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org If the 'required_clk_rate' is greater than the clock rate that can be provided, then when mul_u64_u64_div_u64() is called to determine the 'rate' for the PWM divider, 0 will be returned. If 'rate' is 0, then we will return -EINVAL and fail to configure the PWM. Fix this by adding 1 to the PWM_DUTY_WIDTH when calculating the 'required_clk_rate' to ensure that 'rate' is greater or equal to 1. This fixes an issue on Tegra234 where configuring the PWM fan fails. Fixes: 8c193f4714df ("pwm: tegra: Optimize period calculation") Signed-off-by: Jon Hunter --- drivers/pwm/pwm-tegra.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c index 8a33c500f93b..973e2c1533ab 100644 --- a/drivers/pwm/pwm-tegra.c +++ b/drivers/pwm/pwm-tegra.c @@ -148,6 +148,19 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, required_clk_rate = DIV_ROUND_UP_ULL((NSEC_PER_SEC << PWM_DUTY_WIDTH), period_ns); + /* + * If the 'required_clk_rate' is greater than the clock rate + * that can be provided, then when mul_u64_u64_div_u64() is + * called to determine the 'rate' for the PWM divider, 0 will + * be returned. If 'rate' is 0, then we will return -EINVAL and + * fail to configure the PWM. If this case, add 1 to the + * PWM_DUTY_WIDTH when calculating the 'required_clk_rate' to + * ensure that 'rate' is greater or equal to 1. + */ + if (required_clk_rate > clk_round_rate(pc->clk, required_clk_rate)) + required_clk_rate = DIV_ROUND_UP_ULL((NSEC_PER_SEC << (PWM_DUTY_WIDTH + 1)), + period_ns); + err = dev_pm_opp_set_rate(pc->dev, required_clk_rate); if (err < 0) return -EINVAL;