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Thu, 21 Mar 2019 21:29:53 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas1p1.samsung.com (KnoxPortal) with ESMTPA id 20190321122953epcas1p192f681df4dff207eae429e7b59db46af~N_ScqtbYV1075710757epcas1p1X; Thu, 21 Mar 2019 12:29:53 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20190321122953epsmtrp2d99e115518aa2dd51d35a615496e9e11~N_ScnejxG0292502925epsmtrp2W; Thu, 21 Mar 2019 12:29:53 +0000 (GMT) X-AuditID: b6c32a39-8b7ff7000000100c-1d-5c9383c175ce Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 67.6B.03692.0C3839C5; Thu, 21 Mar 2019 21:29:52 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20190321122952epsmtip25680efc3cb9a9606d00ec5fcfc74aca4~N_ScajTKM2765327653epsmtip2W; Thu, 21 Mar 2019 12:29:52 +0000 (GMT) Subject: Re: [PATCH v2] clocksource: exynos_mct: Increase priority over ARM arch timer To: Marek Szyprowski , linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Thomas Gleixner , Daniel Lezcano , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz From: Chanwoo Choi Organization: Samsung Electronics Message-ID: Date: Thu, 21 Mar 2019 21:30:08 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190321082608.21366-1-m.szyprowski@samsung.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA01Se0hTcRTmtzvvrtXquixPg5bdnhrqrja7ilrQgwuZmYFFGXrT2xT3YndK VvSgkY/eDaPWw8gsk2S1dIllkpklgRPsRWRYswdFalpR/qFtu4v87zvnfN855/v9DoEpHLiS KDBYeLOB01H4JKnrYUR01IODtix1qVXN3DrjCGIujsxm3O6bMsbpeRHE9DSfx5kz7vsSpr69 V8bcdlZiKwjWWVeOs29e3MPZga4uGXv7yj72WEMdYkecqnR8S2FSPs/l8eZw3pBrzCswaJOp tRuzV2Zr4tV0FJ3ALKPCDZyeT6ZWpaZHrSnQedehwos5XZE3lc4JAhWTkmQ2Fln48HyjYEmm eFOezpRgihY4vVBk0EbnGvWJtFodq/EScwrz+598lZl+he609XzH96OGkAoUTAC5FF66Tssq 0CRCQTYh+NzXIRGDYQTPRt2Byi8EL28MBf2TWIdf42KhBcHgWE2ANYjg6vBl5GNNJzeDq+et nxVK2hG4PY2YL8DIRgSfjtllPhZORkLr51e4D08j58Lz3x6/Wk6mgPuCzTuPIKTkAnA4l/nS M7xNBz/clYqUEOg82+/HwV661XMc82GMDIPX/VUSEc+Bg43n/HOBHMfh8NAdmehhFdQdqQ34 mQ5fHjcE8koYGWjBRbwbrne246K4DEFDa3dAEAetNTaJbzmMjABHc4w4bCoM/Dzi3xlIOZQd UojsedDT1ysR8SyoLi0PtGdhtNuFnUBz7RPs2CdYsE+wYP8/7BKS1qGZvEnQa3mBNmkm/rcT +Y81MqEJdXSltiGSQNQUORt7KksRxBULJfo2BARGhcqbt9qyFPI8rmQXbzZmm4t0vNCGNN7H PokpZ+QavadvsGTTmti4uDhmKR2voWkqTO5YsTJLQWo5C1/I8ybe/E8nIYKV+9HqzJxS65IC +pHlz+bMa+04u/eUyVP1bt722E2Jxe75Gaqh6vfvkmTV2yfv+LZTVXngo2o0sdLTX8mPtzQ1 /TCHdRjJvpzR9Rpiz8OnztxtNZ0RClX8F3t7uXKqZ2vCYmP1FtXz5bUpexdu+F7y4NXNRfZe 61NqLE2b4Tr6tr5wXRolFfI5OhIzC9xfDRKDbsIDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJIsWRmVeSWpSXmKPExsWy7bCSvO6B5skxBv0vrSw2zljPajHvs6zF +fMb2C02Pb7GanF51xw2ixnn9zFZrD1yl91i86apzA4cHptWdbJ53Lm2h83j3blz7B6bl9R7 9G1ZxejxeZNcAFsUl01Kak5mWWqRvl0CV8aTE6/ZC76JVEy+/JGtgXGLYBcjJ4eEgIlEy6db bF2MXBxCArsZJf7sfMgGkZCUmHbxKHMXIweQLSxx+HAxRM1bRomvN2azgtQIC0RIbLt8D6xZ RGAWo8S1tZdYQRxmge2MEle39DJBtExklNg6/QTYWDYBLYn9L26A2fwCihJXfzxmBLF5Bewk zs+dzAqyjkVAVWL9JnOQsCjQhrsXX7BAlAhKnJz5BMzmBCpvedzPDGIzC6hL/Jl3CcoWl7j1 ZD4ThC0v0bx1NvMERuFZSNpnIWmZhaRlFpKWBYwsqxglUwuKc9Nziw0LDPNSy/WKE3OLS/PS 9ZLzczcxgiNMS3MH4+Ul8YcYBTgYlXh4PYwmxQixJpYVV+YeYpTgYFYS4d0VPTlGiDclsbIq tSg/vqg0J7X4EKM0B4uSOO/TvGORQgLpiSWp2ampBalFMFkmDk6pBsb0VhYvvbPyZ/b4fhLP F2Nf8Jcv4NULp6qOV3oZ0XUJJ088W5cZmm4/UdjXl6FnUuzG1H530YmdpmW9uwPfG3B/355+ p+6x/5EaF+7KDTw9gZ+7D8pmrLx7bNblnwvS5fcdWCP/brbm25YtR3Z8iH0hrZl7usch9fRq zh+bOjbxLlpR1W122lKJpTgj0VCLuag4EQCNuWzZrAIAAA== X-CMS-MailID: 20190321122953epcas1p192f681df4dff207eae429e7b59db46af X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20190321082621eucas1p16d48ef152cd76edb7d46e8c773fa000e References: <20190321082608.21366-1-m.szyprowski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Marek, On 19. 3. 21. 오후 5:26, Marek Szyprowski wrote: > Exynos Multi-Core Timer driver (exynos_mct) must be started before ARM > Architected Timers (arch_timer), because they both share some common > hardware blocks (global system counter) and turning on MCT is needed > to get ARM Architected Timer working properly. Increase MCT timer rating > and hotplug priority over ARM Archictected timer driver to achieve that. > > Signed-off-by: Marek Szyprowski > Reviewed-by: Krzysztof Kozlowski > --- > v2: added comments about the relation to ARM arch timer > rebased onto v5.1-rc1 > v1: https://patchwork.kernel.org/patch/10814921/ > --- > drivers/clocksource/exynos_mct.c | 4 ++-- > include/linux/cpuhotplug.h | 2 +- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c > index 34bd250d46c6..6aa10cbc1d59 100644 > --- a/drivers/clocksource/exynos_mct.c > +++ b/drivers/clocksource/exynos_mct.c > @@ -209,7 +209,7 @@ static void exynos4_frc_resume(struct clocksource *cs) > > static struct clocksource mct_frc = { > .name = "mct-frc", > - .rating = 400, > + .rating = 450, /* use value higher than ARM arch timer */ > .read = exynos4_frc_read, > .mask = CLOCKSOURCE_MASK(32), > .flags = CLOCK_SOURCE_IS_CONTINUOUS, > @@ -464,7 +464,7 @@ static int exynos4_mct_starting_cpu(unsigned int cpu) > evt->set_state_oneshot_stopped = set_state_shutdown; > evt->tick_resume = set_state_shutdown; > evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; > - evt->rating = 450; > + evt->rating = 500; /* use value higher than ARM arch timer */ > > exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET); > > diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h > index e78281d07b70..53fb48de9589 100644 > --- a/include/linux/cpuhotplug.h > +++ b/include/linux/cpuhotplug.h > @@ -115,10 +115,10 @@ enum cpuhp_state { > CPUHP_AP_PERF_ARM_ACPI_STARTING, > CPUHP_AP_PERF_ARM_STARTING, > CPUHP_AP_ARM_L2X0_STARTING, > + CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, > CPUHP_AP_ARM_ARCH_TIMER_STARTING, > CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, > CPUHP_AP_JCORE_TIMER_STARTING, > - CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, > CPUHP_AP_ARM_TWD_STARTING, > CPUHP_AP_QCOM_TIMER_STARTING, > CPUHP_AP_TEGRA_TIMER_STARTING, > As the cover-letter, the arch-timer of Exynos SoC used the h/w block of MCT. I agree. 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Thu, 21 Mar 2019 12:29:52 +0000 (GMT) Subject: Re: [PATCH v2] clocksource: exynos_mct: Increase priority over ARM arch timer To: Marek Szyprowski , linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org From: Chanwoo Choi Organization: Samsung Electronics Message-ID: Date: Thu, 21 Mar 2019 21:30:08 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190321082608.21366-1-m.szyprowski@samsung.com> Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA01Se0hTcRTmtzvvrtXquixPg5bdnhrqrja7ilrQgwuZmYFFGXrT2xT3YndK VvSgkY/eDaPWw8gsk2S1dIllkpklgRPsRWRYswdFalpR/qFtu4v87zvnfN855/v9DoEpHLiS KDBYeLOB01H4JKnrYUR01IODtix1qVXN3DrjCGIujsxm3O6bMsbpeRHE9DSfx5kz7vsSpr69 V8bcdlZiKwjWWVeOs29e3MPZga4uGXv7yj72WEMdYkecqnR8S2FSPs/l8eZw3pBrzCswaJOp tRuzV2Zr4tV0FJ3ALKPCDZyeT6ZWpaZHrSnQedehwos5XZE3lc4JAhWTkmQ2Fln48HyjYEmm eFOezpRgihY4vVBk0EbnGvWJtFodq/EScwrz+598lZl+he609XzH96OGkAoUTAC5FF66Tssq 0CRCQTYh+NzXIRGDYQTPRt2Byi8EL28MBf2TWIdf42KhBcHgWE2ANYjg6vBl5GNNJzeDq+et nxVK2hG4PY2YL8DIRgSfjtllPhZORkLr51e4D08j58Lz3x6/Wk6mgPuCzTuPIKTkAnA4l/nS M7xNBz/clYqUEOg82+/HwV661XMc82GMDIPX/VUSEc+Bg43n/HOBHMfh8NAdmehhFdQdqQ34 mQ5fHjcE8koYGWjBRbwbrne246K4DEFDa3dAEAetNTaJbzmMjABHc4w4bCoM/Dzi3xlIOZQd UojsedDT1ysR8SyoLi0PtGdhtNuFnUBz7RPs2CdYsE+wYP8/7BKS1qGZvEnQa3mBNmkm/rcT +Y81MqEJdXSltiGSQNQUORt7KksRxBULJfo2BARGhcqbt9qyFPI8rmQXbzZmm4t0vNCGNN7H PokpZ+QavadvsGTTmti4uDhmKR2voWkqTO5YsTJLQWo5C1/I8ybe/E8nIYKV+9HqzJxS65IC +pHlz+bMa+04u/eUyVP1bt722E2Jxe75Gaqh6vfvkmTV2yfv+LZTVXngo2o0sdLTX8mPtzQ1 /TCHdRjJvpzR9Rpiz8OnztxtNZ0RClX8F3t7uXKqZ2vCYmP1FtXz5bUpexdu+F7y4NXNRfZe 61NqLE2b4Tr6tr5wXRolFfI5OhIzC9xfDRKDbsIDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJIsWRmVeSWpSXmKPExsWy7bCSvO6B5skxBv0vrSw2zljPajHvs6zF +fMb2C02Pb7GanF51xw2ixnn9zFZrD1yl91i86apzA4cHptWdbJ53Lm2h83j3blz7B6bl9R7 9G1ZxejxeZNcAFsUl01Kak5mWWqRvl0CV8aTE6/ZC76JVEy+/JGtgXGLYBcjJ4eEgIlEy6db bF2MXBxCArsZJf7sfMgGkZCUmHbxKHMXIweQLSxx+HAxRM1bRomvN2azgtQIC0RIbLt8D6xZ RGAWo8S1tZdYQRxmge2MEle39DJBtExklNg6/QTYWDYBLYn9L26A2fwCihJXfzxmBLF5Bewk zs+dzAqyjkVAVWL9JnOQsCjQhrsXX7BAlAhKnJz5BMzmBCpvedzPDGIzC6hL/Jl3CcoWl7j1 ZD4ThC0v0bx1NvMERuFZSNpnIWmZhaRlFpKWBYwsqxglUwuKc9Nziw0LDPNSy/WKE3OLS/PS 9ZLzczcxgiNMS3MH4+Ul8YcYBTgYlXh4PYwmxQixJpYVV+YeYpTgYFYS4d0VPTlGiDclsbIq tSg/vqg0J7X4EKM0B4uSOO/TvGORQgLpiSWp2ampBalFMFkmDk6pBsb0VhYvvbPyZ/b4fhLP F2Nf8Jcv4NULp6qOV3oZ0XUJJ088W5cZmm4/UdjXl6FnUuzG1H530YmdpmW9uwPfG3B/355+ p+6x/5EaF+7KDTw9gZ+7D8pmrLx7bNblnwvS5fcdWCP/brbm25YtR3Z8iH0hrZl7usch9fRq zh+bOjbxLlpR1W122lKJpTgj0VCLuag4EQCNuWzZrAIAAA== X-CMS-MailID: 20190321122953epcas1p192f681df4dff207eae429e7b59db46af X-Msg-Generator: CA CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20190321082621eucas1p16d48ef152cd76edb7d46e8c773fa000e References: <20190321082608.21366-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190321_053003_131332_BDD1EA18 X-CRM114-Status: GOOD ( 25.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Gleixner , Daniel Lezcano , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz Content-Type: text/plain; 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