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From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Will Deacon <will@kernel.org>
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64
Date: Mon, 21 Jun 2021 12:18:38 +0200	[thread overview]
Message-ID: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> (raw)
In-Reply-To: <20210621101058.GB28788@willie-the-truck>

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 ?


-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
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WARNING: multiple messages have this Message-ID (diff)
From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Will Deacon <will@kernel.org>
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64
Date: Mon, 21 Jun 2021 12:18:38 +0200	[thread overview]
Message-ID: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> (raw)
In-Reply-To: <20210621101058.GB28788@willie-the-truck>

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 ?


-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

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  reply	other threads:[~2021-06-21 10:18 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 15:43 [PATCH 0/2] Use Exynos-MCT timer as wakeup for Arm arch timer Will Deacon
2021-06-08 15:43 ` Will Deacon
2021-06-08 15:43 ` [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 Will Deacon
2021-06-08 15:43   ` Will Deacon
2021-06-09 11:41   ` Krzysztof Kozlowski
2021-06-09 11:41     ` Krzysztof Kozlowski
2021-06-10  1:03   ` Chanwoo Choi
2021-06-10  1:03     ` Chanwoo Choi
2021-06-16 15:25     ` Daniel Lezcano
2021-06-16 15:25       ` Daniel Lezcano
2021-06-17  0:58       ` Chanwoo Choi
2021-06-17  0:58         ` Chanwoo Choi
2021-06-17 21:47         ` Will Deacon
2021-06-17 21:47           ` Will Deacon
2021-06-21  9:25           ` Daniel Lezcano
2021-06-21  9:25             ` Daniel Lezcano
2021-06-21 10:10             ` Will Deacon
2021-06-21 10:10               ` Will Deacon
2021-06-21 10:18               ` Daniel Lezcano [this message]
2021-06-21 10:18                 ` Daniel Lezcano
2021-06-22  2:40                 ` Chanwoo Choi
2021-06-22  2:40                   ` Chanwoo Choi
2021-06-22  5:21                   ` Daniel Lezcano
2021-06-22  5:21                     ` Daniel Lezcano
2021-06-22  6:42                     ` Chanwoo Choi
2021-06-22  6:42                       ` Chanwoo Choi
2021-06-21 10:17             ` Marek Szyprowski
2021-06-21 10:17               ` Marek Szyprowski
2021-06-21 10:24               ` Daniel Lezcano
2021-06-21 10:24                 ` Daniel Lezcano
2021-08-26 16:25   ` [tip: timers/core] " tip-bot2 for Will Deacon
2021-06-08 15:43 ` [PATCH 2/2] clocksource/drivers/exynos_mct: Mark MCT device as CLOCK_EVT_FEAT_PERCPU Will Deacon
2021-06-08 15:43   ` Will Deacon
2021-06-09 11:41   ` Krzysztof Kozlowski
2021-06-09 11:41     ` Krzysztof Kozlowski
2021-06-17  0:59   ` Chanwoo Choi
2021-06-17  0:59     ` Chanwoo Choi
2021-08-26 16:25   ` [tip: timers/core] " tip-bot2 for Will Deacon

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