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Tue, 22 Jun 2021 02:21:38 +0000 (GMT) Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 To: Daniel Lezcano , Will Deacon Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marek Szyprowski , Krzysztof Kozlowski , Krzysztof Kozlowski , Thomas Gleixner From: Chanwoo Choi Organization: Samsung Electronics Message-ID: Date: Tue, 22 Jun 2021 11:40:50 +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: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> Content-Language: en-US Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCJsWRmVeSWpSXmKPExsWy7bCmga6J58UEg/f/9CzmfZa1OH9+A7vF xrc/mCw2Pb7GanF51xw2i7VH7rJbbN40ldmi5Y6pA4fHrIZeNo9NqzrZPO5c28Pm8e7cOXaP zUvqPfq2rGL0+LxJLoA9KtsmIzUxJbVIITUvOT8lMy/dVsk7ON453tTMwFDX0NLCXEkhLzE3 1VbJxSdA1y0zB+gkJYWyxJxSoFBAYnGxkr6dTVF+aUmqQkZ+cYmtUmpBSk6BZYFecWJucWle ul5yfq6VoYGBkSlQYUJ2xuLToQWbOSr+LF/N1sB4ha2LkZNDQsBEYurlpSxdjFwcQgI7GCUO nLgG5XxilHh27js7hPOZUeLhuncsMC0fzx+GqtrFKPFz1XIo5z2jxLHzL5m7GDk4hAViJa4v VQZpEBHwl5jddhBsErPAf0aJj68/s4Mk2AS0JPa/uAF2CL+AosTVH48ZQWxeATuJFUvvMIPY LAKqEttW3QSrFxUIkzi5rQWqRlDi5MwnYBdxAtWfmN4OVsMsIC5x68l8JghbXmL72znMIIsl BNZySDRueMAK8YKLRNeCRiYIW1ji1fEt7BC2lMTnd3uhIVMtsfLkETaI5g5GiS37L0A1G0vs XzqZCeRLZgFNifW79CHCihI7f89lhFjMJ/Huaw8rSImEAK9ER5sQRImyxOUHd6HWSkosbu9k m8CoNAvJO7OQvDALyQuzEJYtYGRZxSiWWlCcm55abFhgghzbmxjByVXLYgfj3Lcf9A4xMnEw HmKU4GBWEuG9mXIhQYg3JbGyKrUoP76oNCe1+BCjKTCAJzJLiSbnA9N7Xkm8oamRsbGxhYmh mamhoZI47062QwlCAumJJanZqakFqUUwfUwcnFINTJPuL1gx48Zc742rX/9/JBckLPFI5mp4 uEjDle6TZy6+LQytzmiRuWbVYJTW3LvY1MAx5sDvwKYJLZlMa8V6Cp5Y7okT6MlfwFF8j+Ws 4a9Tf1UvnF7F8S/VpmZ/Qeruw59YD+1/e29/mn2ZxHa/f5tvOi/78cWFUe6lQk7pQocFexVv fIyzmdLP+fZ8vGjfsQ9ZUtIrHp0U/LbQcy5H8T5D6/jFixU+G4h07V0ewjtLpe6KLp/1tr+F ay83rfMx+KseIbjBS3nv39Dvk5+tUeR9/0juaN2zZTZTPH5oCGg9OylksLMngWtGQojqh96J rRO2ik1wrzkj9eDpnEux72On+h0qEc/8nXbncPUzrz9KLMUZiYZazEXFiQDou4JWNwQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjkeLIzCtJLcpLzFFi42LZdlhJTtfI82KCwaHpZhbzPstanD+/gd1i 49sfTBabHl9jtbi8aw6bxdojd9ktNm+aymzRcsfUgcNjVkMvm8emVZ1sHneu7WHzeHfuHLvH 5iX1Hn1bVjF6fN4kF8AexWWTkpqTWZZapG+XwJWx+HRowWaOij/LV7M1MF5h62Lk5JAQMJH4 eP4wSxcjF4eQwA5Gia8TjzFDJCQlpl08CmRzANnCEocPF0PUvGWUuHD5JwtIXFggVuL6UmWQ chEBX4n/D66xg9QwCzQySTxfOIEdomEii8SuS89ZQKrYBLQk9r+4AbaZX0BR4uqPx4wgNq+A ncSKpXfAFrMIqEpsW3WTHcQWFQiT2LnkMRNEjaDEyZlPwOZwAtWfmN4OVsMsoC7xZ94lZghb XOLWk/lMELa8xPa3c5gnMArPQtI+C0nLLCQts5C0LGBkWcUomVpQnJueW2xYYJSXWq5XnJhb XJqXrpecn7uJERxlWlo7GPes+qB3iJGJg/EQowQHs5II782UCwlCvCmJlVWpRfnxRaU5qcWH GKU5WJTEeS90nYwXEkhPLEnNTk0tSC2CyTJxcEo1MAWnGMYXtIQHWx5rvLE3o+TptT9WG7a7 1VhMybfeyxpzPmdXYdlew3uf97pceO1+pVvZ5a3i0ZPuHJJ8P/Z9mGus86R45UYJFqkdPKLS sUl7Dhw54a3D5vc9vmLDzT06q5Jr3ZxcboUv23HB6UaWtB7j80WZMm21qpdWXPe6kKz12rPP JezvOsfLfKunqh3wqz/lp96lvnsn4/KzO+c4aLS+WXvJ1KNtPV/y3bsbWe40zJY7dnTTs5WW XacX9K57tr/b50iVTc7C7nvedatv3pvRs63NdYGXs4nZ2h/CTZlJkvcu+AneD17tOWvH/JrP B653aWXv+71BnF9lYVbeVYfdhxdt/ruvNk7XeHbfnVlKLMUZiYZazEXFiQBTgXOsIQMAAA== X-CMS-MailID: 20210622022138epcas1p121cfd8f377ebda53fceaeb99ceaf08cd 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: 20210608154400epcas1p1b22fd50629611a9475cb4d2b8dd9442d References: <20210608154341.10794-1-will@kernel.org> <20210608154341.10794-2-will@kernel.org> <466bfc19-2260-87c6-c458-b43cf23617e3@samsung.com> <2a0181ea-a26e-65e9-16f6-cc233b6b296f@linaro.org> <20210617214748.GC25403@willie-the-truck> <20210621101058.GB28788@willie-the-truck> <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/21/21 7:18 PM, Daniel Lezcano wrote: > On 21/06/2021 12:10, Will Deacon wrote: > > [ ... ] > >>>> exynos4_mct_frc_start() is called unconditionally from probe via >>>> exynos4_clocksource_init() so as long as the mct probes first, then the >>>> arch timer should work, no? The rating shouldn't affect that. >>> >>> How do you ensure the exynos mct is probed before the arch timer ? >>> >>> The Makefile provides the right order, but the dependency is implicit. >> >> Currently, I think it's done by the order of the CPU hotplug notifiers ( >> see the hunk of 6282edb72bed which touches cpuhotplug.h). > > Ah, right. Indeed whatever the DT order, the cpuhotplug order solves the > dependency. > > Chanwoo, are fine with this change ? OK about the order. Actually, I have not fully tested the arch timer on Exynos5433 64bit because of the dependency between arch timer and MCT as we knew. If the Krzysztof and Marek have no any objection, I have no any objection anymore. Thanks. -- 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=-5.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 9B292C4743C for ; Tue, 22 Jun 2021 02:23:52 +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 59E6860E08 for ; Tue, 22 Jun 2021 02:23:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 59E6860E08 Authentication-Results: mail.kernel.org; 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Tue, 22 Jun 2021 11:21:38 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20210622022138epsmtip1ad5ee47b412ceeb52e34d3900f62d008~Kxineta_31343113431epsmtip1V; Tue, 22 Jun 2021 02:21:38 +0000 (GMT) Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 To: Daniel Lezcano , Will Deacon Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marek Szyprowski , Krzysztof Kozlowski , Krzysztof Kozlowski , Thomas Gleixner From: Chanwoo Choi Organization: Samsung Electronics Message-ID: Date: Tue, 22 Jun 2021 11:40:50 +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: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCJsWRmVeSWpSXmKPExsWy7bCmga6J58UEg/f/9CzmfZa1OH9+A7vF xrc/mCw2Pb7GanF51xw2i7VH7rJbbN40ldmi5Y6pA4fHrIZeNo9NqzrZPO5c28Pm8e7cOXaP zUvqPfq2rGL0+LxJLoA9KtsmIzUxJbVIITUvOT8lMy/dVsk7ON453tTMwFDX0NLCXEkhLzE3 1VbJxSdA1y0zB+gkJYWyxJxSoFBAYnGxkr6dTVF+aUmqQkZ+cYmtUmpBSk6BZYFecWJucWle ul5yfq6VoYGBkSlQYUJ2xuLToQWbOSr+LF/N1sB4ha2LkZNDQsBEYurlpSxdjFwcQgI7GCUO nLgG5XxilHh27js7hPOZUeLhuncsMC0fzx+GqtrFKPFz1XIo5z2jxLHzL5m7GDk4hAViJa4v VQZpEBHwl5jddhBsErPAf0aJj68/s4Mk2AS0JPa/uAF2CL+AosTVH48ZQWxeATuJFUvvMIPY LAKqEttW3QSrFxUIkzi5rQWqRlDi5MwnYBdxAtWfmN4OVsMsIC5x68l8JghbXmL72znMIIsl BNZySDRueMAK8YKLRNeCRiYIW1ji1fEt7BC2lMTnd3uhIVMtsfLkETaI5g5GiS37L0A1G0vs XzqZCeRLZgFNifW79CHCihI7f89lhFjMJ/Huaw8rSImEAK9ER5sQRImyxOUHd6HWSkosbu9k m8CoNAvJO7OQvDALyQuzEJYtYGRZxSiWWlCcm55abFhgghzbmxjByVXLYgfj3Lcf9A4xMnEw HmKU4GBWEuG9mXIhQYg3JbGyKrUoP76oNCe1+BCjKTCAJzJLiSbnA9N7Xkm8oamRsbGxhYmh mamhoZI47062QwlCAumJJanZqakFqUUwfUwcnFINTJPuL1gx48Zc742rX/9/JBckLPFI5mp4 uEjDle6TZy6+LQytzmiRuWbVYJTW3LvY1MAx5sDvwKYJLZlMa8V6Cp5Y7okT6MlfwFF8j+Ws 4a9Tf1UvnF7F8S/VpmZ/Qeruw59YD+1/e29/mn2ZxHa/f5tvOi/78cWFUe6lQk7pQocFexVv fIyzmdLP+fZ8vGjfsQ9ZUtIrHp0U/LbQcy5H8T5D6/jFixU+G4h07V0ewjtLpe6KLp/1tr+F ay83rfMx+KseIbjBS3nv39Dvk5+tUeR9/0juaN2zZTZTPH5oCGg9OylksLMngWtGQojqh96J rRO2ik1wrzkj9eDpnEux72On+h0qEc/8nXbncPUzrz9KLMUZiYZazEXFiQDou4JWNwQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjkeLIzCtJLcpLzFFi42LZdlhJTtfI82KCwaHpZhbzPstanD+/gd1i 49sfTBabHl9jtbi8aw6bxdojd9ktNm+aymzRcsfUgcNjVkMvm8emVZ1sHneu7WHzeHfuHLvH 5iX1Hn1bVjF6fN4kF8AexWWTkpqTWZZapG+XwJWx+HRowWaOij/LV7M1MF5h62Lk5JAQMJH4 eP4wSxcjF4eQwA5Gia8TjzFDJCQlpl08CmRzANnCEocPF0PUvGWUuHD5JwtIXFggVuL6UmWQ chEBX4n/D66xg9QwCzQySTxfOIEdomEii8SuS89ZQKrYBLQk9r+4AbaZX0BR4uqPx4wgNq+A ncSKpXfAFrMIqEpsW3WTHcQWFQiT2LnkMRNEjaDEyZlPwOZwAtWfmN4OVsMsoC7xZ94lZghb XOLWk/lMELa8xPa3c5gnMArPQtI+C0nLLCQts5C0LGBkWcUomVpQnJueW2xYYJSXWq5XnJhb XJqXrpecn7uJERxlWlo7GPes+qB3iJGJg/EQowQHs5II782UCwlCvCmJlVWpRfnxRaU5qcWH GKU5WJTEeS90nYwXEkhPLEnNTk0tSC2CyTJxcEo1MAWnGMYXtIQHWx5rvLE3o+TptT9WG7a7 1VhMybfeyxpzPmdXYdlew3uf97pceO1+pVvZ5a3i0ZPuHJJ8P/Z9mGus86R45UYJFqkdPKLS sUl7Dhw54a3D5vc9vmLDzT06q5Jr3ZxcboUv23HB6UaWtB7j80WZMm21qpdWXPe6kKz12rPP JezvOsfLfKunqh3wqz/lp96lvnsn4/KzO+c4aLS+WXvJ1KNtPV/y3bsbWe40zJY7dnTTs5WW XacX9K57tr/b50iVTc7C7nvedatv3pvRs63NdYGXs4nZ2h/CTZlJkvcu+AneD17tOWvH/JrP B653aWXv+71BnF9lYVbeVYfdhxdt/ruvNk7XeHbfnVlKLMUZiYZazEXFiQBTgXOsIQMAAA== X-CMS-MailID: 20210622022138epcas1p121cfd8f377ebda53fceaeb99ceaf08cd X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210608154400epcas1p1b22fd50629611a9475cb4d2b8dd9442d References: <20210608154341.10794-1-will@kernel.org> <20210608154341.10794-2-will@kernel.org> <466bfc19-2260-87c6-c458-b43cf23617e3@samsung.com> <2a0181ea-a26e-65e9-16f6-cc233b6b296f@linaro.org> <20210617214748.GC25403@willie-the-truck> <20210621101058.GB28788@willie-the-truck> <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210621_192149_054090_A30214E3 X-CRM114-Status: GOOD ( 19.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/21/21 7:18 PM, Daniel Lezcano wrote: > On 21/06/2021 12:10, Will Deacon wrote: > > [ ... ] > >>>> exynos4_mct_frc_start() is called unconditionally from probe via >>>> exynos4_clocksource_init() so as long as the mct probes first, then the >>>> arch timer should work, no? The rating shouldn't affect that. >>> >>> How do you ensure the exynos mct is probed before the arch timer ? >>> >>> The Makefile provides the right order, but the dependency is implicit. >> >> Currently, I think it's done by the order of the CPU hotplug notifiers ( >> see the hunk of 6282edb72bed which touches cpuhotplug.h). > > Ah, right. Indeed whatever the DT order, the cpuhotplug order solves the > dependency. > > Chanwoo, are fine with this change ? OK about the order. Actually, I have not fully tested the arch timer on Exynos5433 64bit because of the dependency between arch timer and MCT as we knew. If the Krzysztof and Marek have no any objection, I have no any objection anymore. Thanks. -- Best Regards, Chanwoo Choi Samsung Electronics _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel