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x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.66] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: bd6c229a-daba-4a6e-4af9-08d768b41670 x-ms-traffictypediagnostic: AM0PR04MB4994:|AM0PR04MB4994: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1079; x-forefront-prvs: 02213C82F8 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(396003)(366004)(346002)(376002)(39860400002)(136003)(199004)(189003)(66066001)(305945005)(14454004)(36756003)(71200400001)(71190400001)(4744005)(7736002)(2501003)(99286004)(4326008)(486006)(81156014)(81166006)(25786009)(86362001)(44832011)(2616005)(476003)(50226002)(446003)(11346002)(8676002)(8936002)(52116002)(76176011)(186003)(478600001)(6506007)(386003)(6486002)(6512007)(6436002)(2201001)(102836004)(26005)(316002)(5660300002)(54906003)(110136005)(256004)(3846002)(6116002)(66556008)(6636002)(66446008)(66946007)(64756008)(66476007)(2906002);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB4994;H:AM0PR04MB4481.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: UMqzF/Sh6EO0BeTcSsOmiafcoSCG7f3R+IyjF+W1paKO45SO7HTBtrg8FsxsuLb7u/Q0bUzRvt5oJj8khahSt+tx/3tq5xe8/mZZUaGhN8wBavM5eqUFQPd1+nRrsV6P6JvTFVXl903dwbYYwF9sRiKhtFKfOshOsFTZkx+p8LYsjsd2LMbqwuWlCW1C9qjjVl2hk7rrhfaxWYcFT6ZkK41qDe+/AgxOt4vBQp6wFrF0AEWlZdHw9jxjxr8SE4SF2t5jKcN8bYeVzVpjIA2eSXdL1nuSvcMoG/kI7are0hQjqnMCG0ugWMDUQQRr5m5zSbGfUo03m77P2t+rd3TjytZaC89se1wIKiVIiEmNDx7DWMoKo1z0vJijyU9CGOAbwiYOerdFVPDq4qbfGR826psPbz2yQMWRcxwLDzZ3w1+qMIIniGlDE1y4Tu5yJnTW Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: bd6c229a-daba-4a6e-4af9-08d768b41670 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Nov 2019 03:38:17.9752 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 8hzpYQ5qEiFnsd/yTBxuxDlPT/4lj5XnaIUXtyoJg34nUldMmSx0YT+Hy8Ujbxd1Of3cLRK15Dx0KjPdErxIhg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4994 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peng Fan To ensure writes to clock registers have properly completed, add a readl after writel_relaxed. Then we could make sure when udelay, write has been completed. Signed-off-by: Peng Fan Cc: Will Deacon --- drivers/clk/imx/clk-pll14xx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c index 5b7d41d43b3b..a8af949f0848 100644 --- a/drivers/clk/imx/clk-pll14xx.c +++ b/drivers/clk/imx/clk-pll14xx.c @@ -205,6 +205,12 @@ static int clk_pll1416x_set_rate(struct clk_hw *hw, un= signed long drate, (rate->sdiv << SDIV_SHIFT); writel_relaxed(div_val, pll->base + 0x4); =20 + /* + * readl will force write completed. There is a udelay below, + * we need make sure before udelay, write has been completed + */ + readl(pll->base + 0x4); + /* * According to SPEC, t3 - t2 need to be greater than * 1us and 1/FREF, respectively. --=20 2.16.4 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,URIBL_BLOCKED,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 4D97EC432C3 for ; Thu, 14 Nov 2019 03:38:46 +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 46A90206E1 for ; 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Thu, 14 Nov 2019 03:38:18 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c%4]) with mapi id 15.20.2451.024; Thu, 14 Nov 2019 03:38:18 +0000 From: Peng Fan To: "sboyd@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "festevam@gmail.com" , Abel Vesa Subject: [PATCH V2 2/4] clk: imx: pll14xx: use readl to force write completed Thread-Topic: [PATCH V2 2/4] clk: imx: pll14xx: use readl to force write completed Thread-Index: AQHVmpz0REJ7jtn970iVrRhgUSL+2Q== Date: Thu, 14 Nov 2019 03:38:17 +0000 Message-ID: <1573702559-2744-3-git-send-email-peng.fan@nxp.com> References: <1573702559-2744-1-git-send-email-peng.fan@nxp.com> In-Reply-To: <1573702559-2744-1-git-send-email-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK0PR01CA0033.apcprd01.prod.exchangelabs.com (2603:1096:203:3e::21) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; 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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 From: Peng Fan To ensure writes to clock registers have properly completed, add a readl after writel_relaxed. Then we could make sure when udelay, write has been completed. Signed-off-by: Peng Fan Cc: Will Deacon --- drivers/clk/imx/clk-pll14xx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c index 5b7d41d43b3b..a8af949f0848 100644 --- a/drivers/clk/imx/clk-pll14xx.c +++ b/drivers/clk/imx/clk-pll14xx.c @@ -205,6 +205,12 @@ static int clk_pll1416x_set_rate(struct clk_hw *hw, unsigned long drate, (rate->sdiv << SDIV_SHIFT); writel_relaxed(div_val, pll->base + 0x4); + /* + * readl will force write completed. There is a udelay below, + * we need make sure before udelay, write has been completed + */ + readl(pll->base + 0x4); + /* * According to SPEC, t3 - t2 need to be greater than * 1us and 1/FREF, respectively. -- 2.16.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel