linux-kernel - Re: [PATCH v3] clocksource: exynos_mct: Increase priority over ARM arch timer

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Message-ID: <a0a97d11-b422-b2c1-0415-ada85f1f493c@linaro.org>
Date:   Fri, 31 May 2019 16:50:44 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3] clocksource: exynos_mct: Increase priority over ARM
 arch timer

On 30/05/2019 12:50, Marek Szyprowski wrote:
> Exynos SoCs based on CA7/CA15 have 2 timer interfaces: custom Exynos MCT
> (Multi Core Timer) and standard ARM Architected Timers.
> 
> There are use cases, where both timer interfaces are used simultanously.
> One of such examples is using Exynos MCT for the main system timer and
> ARM Architected Timers for the KVM and virtualized guests (KVM requires
> arch timers).
> 
> Exynos Multi-Core Timer driver (exynos_mct) must be however 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.
> 
> To ensure selecting Exynos MCT as the main system timer, increase MCT
> timer rating. To ensure proper starting order of both timers during
> suspend/resume cycle, increase MCT hotplug priority over ARM Archictected
> Timers.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---

Applied thanks!

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