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Tue, 22 Jun 2021 06:23:09 +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: <4084b547-0bd2-4309-0948-384b81f1026f@samsung.com> Date: Tue, 22 Jun 2021 15:42:24 +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: <1f4d7943-c540-bafd-b372-0d0ed8172f33@linaro.org> Content-Language: en-US Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCJsWRmVeSWpSXmKPExsWy7bCmvu65xosJBsd3i1rM+yxrcf78BnaL jW9/MFlsenyN1eLyrjlsFmuP3GW32LxpKrNFyx1TBw6PWQ29bB6bVnWyedy5tofN4925c+we m5fUe/RtWcXo8XmTXAB7VLZNRmpiSmqRQmpecn5KZl66rZJ3cLxzvKmZgaGuoaWFuZJCXmJu qq2Si0+ArltmDtBJSgpliTmlQKGAxOJiJX07m6L80pJUhYz84hJbpdSClJwCywK94sTc4tK8 dL3k/FwrQwMDI1OgwoTsjHufFzIXHOSu+N4Z18A4gbOLkZNDQsBE4teTBYxdjFwcQgI7GCWe TdzECuF8YpToPnOPGcL5xihx8sQidpiWe6u+QlXtZZTY+aiVBcJ5zyix8uIsoAwHh7BArMT1 pcogDSIC/hKz2w6yg9QwC/xnlPj4+jPYJDYBLYn9L26wgdj8AooSV388ZgSxeQXsJOZcusQM YrMIqEp8PPAWrF5UIEzi5LYWqBpBiZMzn7CA2JxA9dNuXACbwywgLnHryXwmCFteYvvbOWAv SAis5ZBY+GoxI8QLLhJ/Jv1mgrCFJV4d3wL1mpTE53d72SDsaomVJ4+wQTR3MEps2X+BFSJh LLF/6WQmkC+ZBTQl1u/ShwgrSuz8PZcRYjGfxLuvPeCAkBDglehoE4IoUZa4/OAu1FpJicXt nWwTGJVmIXlnFpIXZiF5YRbCsgWMLKsYxVILinPTU4sNC4yRY3sTIzi5apnvYJz29oPeIUYm DsZDjBIczEoivC+yLyYI8aYkVlalFuXHF5XmpBYfYjQFBvBEZinR5Hxges8riTc0NTI2NrYw MTQzNTRUEufdyXYoQUggPbEkNTs1tSC1CKaPiYNTqoGJy+pK4Z2NuV9zD/1vc1qW0aW6/UmH iPHalaz/viXveJUc27yx17Y9SXLixWiBfbbq66/O9RFdPu3OhQPpgbpsU14l9yRN2/aT64nv XJVlh1uM5y7JnNNQNC3N8+NzZ1GVrEuFM3zWMFmVLDXyOfnax+vSXqXnSa9/xccePTmzevat u48/Z6Y7iT3ykZ8v9vgO39q9ARkzgv18H3E18Gn0ZjzvCshgW8w80/QC02t15f9uew1U3sv+ ZXq1I3KxSw7/qglXZff90Vx4xurKglecN2pf9KVpr+GfaLV+x2Uhs/xC0R0vRRg5vK1jKhOl m044Bxc7XL/F09o+leXIgreuq0Nis3TLVtpUe346dN1ciaU4I9FQi7moOBEAC6FdHTcEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplkeLIzCtJLcpLzFFi42LZdlhJTvds48UEg54jqhbzPstanD+/gd1i 49sfTBabHl9jtbi8aw6bxdojd9ktNm+aymzRcsfUgcNjVkMvm8emVZ1sHneu7WHzeHfuHLvH 5iX1Hn1bVjF6fN4kF8AexWWTkpqTWZZapG+XwJVx7/NC5oKD3BXfO+MaGCdwdjFyckgImEjc W/WVtYuRi0NIYDejxOHvt9kgEpIS0y4eZe5i5ACyhSUOHy4GCQsJvGWU2D3fGSQsLBArcX2p MkhYRMBX4v+Da+wgY5gFGpkkni+cwA4x8xeLxJqlE5hBqtgEtCT2v7gBNp9fQFHi6o/HjCA2 r4CdxJxLl8BqWARUJT4eeMsOYosKhEnsXPKYCaJGUOLkzCcsIDYnUP20GxfA5jALqEv8mQfR yywgLnHryXwmCFteYvvbOcwTGIVnIWmfhaRlFpKWWUhaFjCyrGKUTC0ozk3PLTYsMMxLLdcr TswtLs1L10vOz93ECI4xLc0djNtXfdA7xMjEwXiIUYKDWUmE90X2xQQh3pTEyqrUovz4otKc 1OJDjNIcLErivBe6TsYLCaQnlqRmp6YWpBbBZJk4OKUamJh7vj3Q8nl0eKPttG3Pp36ou7h6 isrUjXMXpu1PDW52Cpyr+89Juq7N9qrhlTkqbmdDZA2Fev//W/yq0LPitVxCjvH5bP/dS66x sdsLcOalzPrftyFC4Ym+110F3tyb7qfrOOruHGCv4GHrPWPG/DjCeuWDv+f7zQy+fWTYumvL udtC+W88MtfGFb0uapEM+fqruFrq55VT0VrHWou9bQtzKvYbb1xRlLe++puF79/SiyLtDX6e V5YZx5+99+xuvky0Ucm9hPszMy35t+3XW7JmseLrleZvXrZqr/TkP+h7qubw81Vy8Y94nK98 udx8wKB+VcmtK3OKsgXXVl14wPeVS7v1mRjHi8dnmTTEhJVYijMSDbWYi4oTAXRXaykgAwAA X-CMS-MailID: 20210622062309epcas1p37ac8ec81df7fbbf4f3e3e95a614a85bc 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> <1f4d7943-c540-bafd-b372-0d0ed8172f33@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/22/21 2:21 PM, Daniel Lezcano wrote: > On 22/06/2021 04:40, Chanwoo Choi wrote: >> 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. >> > > Shall I consider it as an Acked-by ? > Unfortunately, it is not acked. Just no objection. I'm not sure that all cases will be working when using arch timer because as I said, I have only used the exynos mct timer for all of cases. -- 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=-5.5 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 328A7C2B9F4 for ; Tue, 22 Jun 2021 06:25:29 +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 E81606100B for ; 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Tue, 22 Jun 2021 15:23:09 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20210622062309epsmtip1b8e42aec48c2e2f1e90d25979cd36569~K01fBXEDF0264802648epsmtip1R; Tue, 22 Jun 2021 06:23:09 +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: <4084b547-0bd2-4309-0948-384b81f1026f@samsung.com> Date: Tue, 22 Jun 2021 15:42:24 +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: <1f4d7943-c540-bafd-b372-0d0ed8172f33@linaro.org> Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrCJsWRmVeSWpSXmKPExsWy7bCmvu65xosJBsd3i1rM+yxrcf78BnaL jW9/MFlsenyN1eLyrjlsFmuP3GW32LxpKrNFyx1TBw6PWQ29bB6bVnWyedy5tofN4925c+we m5fUe/RtWcXo8XmTXAB7VLZNRmpiSmqRQmpecn5KZl66rZJ3cLxzvKmZgaGuoaWFuZJCXmJu qq2Si0+ArltmDtBJSgpliTmlQKGAxOJiJX07m6L80pJUhYz84hJbpdSClJwCywK94sTc4tK8 dL3k/FwrQwMDI1OgwoTsjHufFzIXHOSu+N4Z18A4gbOLkZNDQsBE4teTBYxdjFwcQgI7GCWe TdzECuF8YpToPnOPGcL5xihx8sQidpiWe6u+QlXtZZTY+aiVBcJ5zyix8uIsoAwHh7BArMT1 pcogDSIC/hKz2w6yg9QwC/xnlPj4+jPYJDYBLYn9L26wgdj8AooSV388ZgSxeQXsJOZcusQM YrMIqEp8PPAWrF5UIEzi5LYWqBpBiZMzn7CA2JxA9dNuXACbwywgLnHryXwmCFteYvvbOWAv SAis5ZBY+GoxI8QLLhJ/Jv1mgrCFJV4d3wL1mpTE53d72SDsaomVJ4+wQTR3MEps2X+BFSJh LLF/6WQmkC+ZBTQl1u/ShwgrSuz8PZcRYjGfxLuvPeCAkBDglehoE4IoUZa4/OAu1FpJicXt nWwTGJVmIXlnFpIXZiF5YRbCsgWMLKsYxVILinPTU4sNC4yRY3sTIzi5apnvYJz29oPeIUYm DsZDjBIczEoivC+yLyYI8aYkVlalFuXHF5XmpBYfYjQFBvBEZinR5Hxges8riTc0NTI2NrYw MTQzNTRUEufdyXYoQUggPbEkNTs1tSC1CKaPiYNTqoGJy+pK4Z2NuV9zD/1vc1qW0aW6/UmH iPHalaz/viXveJUc27yx17Y9SXLixWiBfbbq66/O9RFdPu3OhQPpgbpsU14l9yRN2/aT64nv XJVlh1uM5y7JnNNQNC3N8+NzZ1GVrEuFM3zWMFmVLDXyOfnax+vSXqXnSa9/xccePTmzevat u48/Z6Y7iT3ykZ8v9vgO39q9ARkzgv18H3E18Gn0ZjzvCshgW8w80/QC02t15f9uew1U3sv+ ZXq1I3KxSw7/qglXZff90Vx4xurKglecN2pf9KVpr+GfaLV+x2Uhs/xC0R0vRRg5vK1jKhOl m044Bxc7XL/F09o+leXIgreuq0Nis3TLVtpUe346dN1ciaU4I9FQi7moOBEAC6FdHTcEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplkeLIzCtJLcpLzFFi42LZdlhJTvds48UEg54jqhbzPstanD+/gd1i 49sfTBabHl9jtbi8aw6bxdojd9ktNm+aymzRcsfUgcNjVkMvm8emVZ1sHneu7WHzeHfuHLvH 5iX1Hn1bVjF6fN4kF8AexWWTkpqTWZZapG+XwJVx7/NC5oKD3BXfO+MaGCdwdjFyckgImEjc W/WVtYuRi0NIYDejxOHvt9kgEpIS0y4eZe5i5ACyhSUOHy4GCQsJvGWU2D3fGSQsLBArcX2p MkhYRMBX4v+Da+wgY5gFGpkkni+cwA4x8xeLxJqlE5hBqtgEtCT2v7gBNp9fQFHi6o/HjCA2 r4CdxJxLl8BqWARUJT4eeMsOYosKhEnsXPKYCaJGUOLkzCcsIDYnUP20GxfA5jALqEv8mQfR yywgLnHryXwmCFteYvvbOcwTGIVnIWmfhaRlFpKWWUhaFjCyrGKUTC0ozk3PLTYsMMxLLdcr TswtLs1L10vOz93ECI4xLc0djNtXfdA7xMjEwXiIUYKDWUmE90X2xQQh3pTEyqrUovz4otKc 1OJDjNIcLErivBe6TsYLCaQnlqRmp6YWpBbBZJk4OKUamJh7vj3Q8nl0eKPttG3Pp36ou7h6 isrUjXMXpu1PDW52Cpyr+89Juq7N9qrhlTkqbmdDZA2Fev//W/yq0LPitVxCjvH5bP/dS66x sdsLcOalzPrftyFC4Ym+110F3tyb7qfrOOruHGCv4GHrPWPG/DjCeuWDv+f7zQy+fWTYumvL udtC+W88MtfGFb0uapEM+fqruFrq55VT0VrHWou9bQtzKvYbb1xRlLe++puF79/SiyLtDX6e V5YZx5+99+xuvky0Ucm9hPszMy35t+3XW7JmseLrleZvXrZqr/TkP+h7qubw81Vy8Y94nK98 udx8wKB+VcmtK3OKsgXXVl14wPeVS7v1mRjHi8dnmTTEhJVYijMSDbWYi4oTAXRXaykgAwAA X-CMS-MailID: 20210622062309epcas1p37ac8ec81df7fbbf4f3e3e95a614a85bc 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> <1f4d7943-c540-bafd-b372-0d0ed8172f33@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210621_232323_895893_E809A8FF X-CRM114-Status: GOOD ( 25.20 ) 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 6/22/21 2:21 PM, Daniel Lezcano wrote: > On 22/06/2021 04:40, Chanwoo Choi wrote: >> 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. >> > > Shall I consider it as an Acked-by ? > Unfortunately, it is not acked. Just no objection. I'm not sure that all cases will be working when using arch timer because as I said, I have only used the exynos mct timer for all of cases. -- 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