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Mon, 26 Oct 2020 14:32:35 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20201026053235epsmtip2184f98d87a9a3c0045043aa06d1285a2~Bc_GlRiKt2730627306epsmtip2D; Mon, 26 Oct 2020 05:32:35 +0000 (GMT) Subject: Re: [PATCH] clk: exynos7: Mark aclk_fsys1_200 as critical To: =?UTF-8?Q?Pawe=c5=82_Chmiel?= , kgene@kernel.org, krzk@kernel.org, mturquette@baylibre.com, sboyd@kernel.org Cc: s.nawrocki@samsung.com, tomasz.figa@gmail.com, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: Chanwoo Choi Organization: Samsung Electronics Message-ID: <56fb4ede-e81a-5721-1927-77f2410d5885@samsung.com> Date: Mon, 26 Oct 2020 14:46:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Thunderbird/59.0 MIME-Version: 1.0 In-Reply-To: <20201024154346.9589-1-pawel.mikolaj.chmiel@gmail.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrHJsWRmVeSWpSXmKPExsWy7bCmvm5J/LR4g533uC36H79mtjh/fgO7 xabH11gtPvbcY7W4vGsOm8WM8/uYLC6ecrX4cbyP2eLwm3ZWi3/XNrJYrNr1h9GB2+P9jVZ2 j52z7rJ7bFrVyeaxeUm9R9+WVYwenzfJBbBFZdtkpCampBYppOYl56dk5qXbKnkHxzvHm5oZ GOoaWlqYKynkJeam2iq5+AToumXmAF2npFCWmFMKFApILC5W0rezKcovLUlVyMgvLrFVSi1I ySmwLNArTswtLs1L10vOz7UyNDAwMgUqTMjOaGzdxVrwgL/i3OqEBsYW3i5GTg4JAROJGbc/ MXYxcnEICexglHh/6QwzSEJI4BOjRN/kCIjEZ0aJ5tmPmLoYOcA6Hk6UhIjvYpR4vvsLVMN7 RokJDVUgtrCAk8ThxfdYQIpEBCYxSvx98JoVxGEW2M4osenONnaQKjYBLYn9L26wgdj8AooS V388ZgSxeQXsJNo/3GcCsVkEVCU6e4+zgtiiAmESJ7e1QNUISpyc+YQFxOYUcJb4smsKWD2z gLjErSfzoWx5ieats5lBFksIHOCQaPmxkgniaReJkz/+MkPYwhKvjm9hh7ClJD6/28sGYVdL rDx5hA2iuYNRYsv+C6wQCWOJ/Usng8OCWUBTYv0ufYiwosTO33MZIRbzSbz72sMKCS5eiY42 IYgSZYnLD+5CnSApsbi9k20Co9IsJO/MQvLCLCQvzEJYtoCRZRWjWGpBcW56arFhgTFyZG9i BCdcLfMdjNPeftA7xMjEwXiIUYKDWUmEd47M1Hgh3pTEyqrUovz4otKc1OJDjKbAAJ7ILCWa nA9M+Xkl8YamRsbGxhYmhmamhoZK4rx/tDvihQTSE0tSs1NTC1KLYPqYODilGph8xcxcfht7 qr71Z7xwYoLdDHHFoPR19yM8dyRq+Hzp/yr/Nvjd3iotMRalH/vntb5kUueM+BI+5xq70aqJ sab5IQHdM0MnGsVxHczs4rqz7VPw05fXHKJKeJr+X3imeXGrbqYjn8N2uZaE93f4muxtLl++ z5yY6K/b5XNCodNh3gpPJf6J57mWxMg+v6P7c97LEj7H2WI3GV7N6J0x8xObavbJiVVbF4qe v7ydLU1G2cNe++EOl3/rZ/XsWNOT9OXY67y13daPUw9P8hVq6+l4t9uq++8nAUcpzpW9Sw1C Zn9TTGSuvNUi69L8+vn6bi4lqdWh/ydmSwU+2JU5+fV9rh1G970KWLPMSqU37FViKc5INNRi LipOBAA6pPrsQQQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJIsWRmVeSWpSXmKPExsWy7bCSvG5x/LR4g923pCz6H79mtjh/fgO7 xabH11gtPvbcY7W4vGsOm8WM8/uYLC6ecrX4cbyP2eLwm3ZWi3/XNrJYrNr1h9GB2+P9jVZ2 j52z7rJ7bFrVyeaxeUm9R9+WVYwenzfJBbBFcdmkpOZklqUW6dslcGU0tu5iLXjAX3FudUID YwtvFyMHh4SAicTDiZJdjFwcQgI7GCVeX33I2sXICRSXlJh28SgzRI2wxOHDxRA1bxklNu95 yAhSIyzgJHF48T0WkISIwCRGiU8fO9lBHGaB7YwSXw8eYAKpEhKYxijRv9UMxGYT0JLY/+IG G4jNL6AocfXHY7BJvAJ2Eu0f7oPVswioSnT2Hge7QlQgTGLnksdMEDWCEidnPmEBsTkFnCW+ 7JoCFmcWUJf4M+8SM4QtLnHryXyouLxE89bZzBMYhWchaZ+FpGUWkpZZSFoWMLKsYpRMLSjO Tc8tNiwwykst1ytOzC0uzUvXS87P3cQIjj0trR2Me1Z90DvEyMTBeIhRgoNZSYR3jszUeCHe lMTKqtSi/Pii0pzU4kOM0hwsSuK8X2ctjBMSSE8sSc1OTS1ILYLJMnFwSjUwNcx0yTk29Uwz p9wy2a88dgE77O9VqXnLGl5ZVft7tbXaT1PjSz9N1/rnxr9Ynv8608rylPoCTqVSx9aG3y87 p7YuX/ryVWjWKqXoHuEFzzZEfZg63zGUJ/Lgoqz5x1fyuDsdtpaeLaYZH8YcOaVpe0d+2Zlz zlZ5ejVbQqaFiO54ZR6gzSB0at0NFYO6lrD9iYdZYxcbW6xI/elvsal+l3bz3e9TVrFIFif+ XH5ixktmqZcTC55z7+5xqWlcbu6U+59306NL1rbe51W+eWlaJghHx5+YanHK4pMNW8p36xzX E1+vPTBjYluS8dJFdfKdfS67D4reM3nZ9T18fTz/H7HLuxbeOMypksm0W9pciaU4I9FQi7mo OBEAA8zKtiwDAAA= X-CMS-MailID: 20201026053235epcas1p3fc6aafa2a1e33066b70535824385b0c7 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20201024154433epcas1p3e6cbd7855e24cb5798026134e61c05b1 References: <20201024154346.9589-1-pawel.mikolaj.chmiel@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Paweł Chmiel, On 10/25/20 12:43 AM, Paweł Chmiel wrote: > This clock must be always enabled to allow access to any registers in > fsys1 CMU. Until proper solution based on runtime PM is applied > (similar to what was done for Exynos5433), mark that clock as critical > so it won't be disabled. > > It was observed on Samsung Galaxy S6 device (based on Exynos7420), where > UFS module is probed before pmic used to power that device. > In this case defer probe was happening and that clock was disabled by > UFS driver, causing whole boot to hang on next CMU access. > > Signed-off-by: Paweł Chmiel > --- > drivers/clk/samsung/clk-exynos7.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/clk/samsung/clk-exynos7.c b/drivers/clk/samsung/clk-exynos7.c > index c1ff715e960c..1048d83f097b 100644 > --- a/drivers/clk/samsung/clk-exynos7.c > +++ b/drivers/clk/samsung/clk-exynos7.c > @@ -538,7 +538,8 @@ static const struct samsung_gate_clock top1_gate_clks[] __initconst = { > ENABLE_ACLK_TOP13, 28, CLK_SET_RATE_PARENT | > CLK_IS_CRITICAL, 0), > GATE(CLK_ACLK_FSYS1_200, "aclk_fsys1_200", "dout_aclk_fsys1_200", > - ENABLE_ACLK_TOP13, 24, CLK_SET_RATE_PARENT, 0), > + ENABLE_ACLK_TOP13, 24, CLK_SET_RATE_PARENT | > + CLK_IS_CRITICAL, 0), As you commented, in order to keep the always on state, we can use CLK_IS_CRITICAL. Instead, you can enable the specific clock with detailed comment on clk-exynos7.c as following merged patches[1][2]: [1] 67f96ff7c8f0 ("clk: samsung: exynos5420: Keep top G3D clocks enabled") [2] 0212a0483b0a ("clk: samsung: Keep top BPLL mux on Exynos542x enabled") The patches[1][2] enable the clock with clk_prepare_enable() instead of adding CLK_IS_CRITICAL. You can refer to it. > > GATE(CLK_SCLK_PHY_FSYS1_26M, "sclk_phy_fsys1_26m", > "dout_sclk_phy_fsys1_26m", ENABLE_SCLK_TOP1_FSYS11, > -- Best Regards, Chanwoo Choi Samsung Electronics 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=-13.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 086BCC2D0A3 for ; Mon, 26 Oct 2020 05:34:42 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 958812087C for ; 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