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From: Marek Szyprowski <m.szyprowski@samsung.com>
To: linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH 3/5] clocksource: exynos_mct: Increase priority over ARM arch timer
Date: Fri, 15 Feb 2019 13:52:27 +0100	[thread overview]
Message-ID: <20190215125229.30180-4-m.szyprowski@samsung.com> (raw)
In-Reply-To: <20190215125229.30180-1-m.szyprowski@samsung.com>

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 <m.szyprowski@samsung.com>
---
 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 49413900b24c..58090f57ada3 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -211,7 +211,7 @@ static void exynos4_frc_resume(struct clocksource *cs)
 
 static struct clocksource mct_frc = {
 	.name		= "mct-frc",
-	.rating		= 400,
+	.rating		= 450,
 	.read		= exynos4_frc_read,
 	.mask		= CLOCKSOURCE_MASK(32),
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
@@ -465,7 +465,7 @@ 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;
 
 	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 fd586d0301e7..bdd544f21102 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_ARMADA_TIMER_STARTING,
-- 
2.17.1


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  parent reply	other threads:[~2019-02-15 12:53 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190215125238eucas1p2f56fe48600aedcec048bc378ed184419@eucas1p2.samsung.com>
2019-02-15 12:52 ` [PATCH 0/5] Exynos SoCs: enable support for ARM Architected Timers Marek Szyprowski
2019-02-15 12:52   ` [PATCH 1/5] clocksource: exynos_mct: Remove dead code Marek Szyprowski
2019-02-15 12:52   ` [PATCH v4 2/6] clocksource: exynos_mct: Fix error path in timer resources initialization Marek Szyprowski
2019-02-15 12:52   ` Marek Szyprowski [this message]
2019-02-15 12:59     ` [PATCH 3/5] clocksource: exynos_mct: Increase priority over ARM arch timer Krzysztof Kozlowski
2019-02-15 16:35     ` Daniel Lezcano
2019-02-18  7:41       ` Marek Szyprowski
2019-02-18  9:24         ` Daniel Lezcano
2019-02-18  9:49           ` Marek Szyprowski
2019-02-18 10:21             ` Daniel Lezcano
2019-02-18  8:53       ` Krzysztof Kozlowski
2019-02-18  8:55         ` Daniel Lezcano
2019-02-15 12:52   ` [PATCH 4/5] ARM: dts: exynos: Add support ARM architected timers Marek Szyprowski
2019-02-18 11:58     ` Chanwoo Choi
2019-02-18 12:24       ` Marek Szyprowski
2019-02-19  0:03         ` Chanwoo Choi
2019-02-15 12:52   ` [PATCH 5/5] ARM: exynos: Enable support for " Marek Szyprowski
2019-02-19  0:06     ` Chanwoo Choi
2019-02-15 16:36   ` [PATCH 0/5] Exynos SoCs: enable support for ARM Architected Timers Daniel Lezcano

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