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linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Thomas Gleixner , Krzysztof Kozlowski , Chanwoo Choi , Bartlomiej Zolnierkiewicz References: <20190530105043.29965-1-m.szyprowski@samsung.com> From: Daniel Lezcano Openpgp: preference=signencrypt Autocrypt: addr=daniel.lezcano@linaro.org; prefer-encrypt=mutual; keydata= mQINBFv/yykBEADDdW8RZu7iZILSf3zxq5y8YdaeyZjI/MaqgnvG/c3WjFaunoTMspeusiFE sXvtg3ehTOoyD0oFjKkHaia1Zpa1m/gnNdT/WvTveLfGA1gH+yGes2Sr53Ht8hWYZFYMZc8V 2pbSKh8wepq4g8r5YI1XUy9YbcTdj5mVrTklyGWA49NOeJz2QbfytMT3DJmk40LqwK6CCSU0 9Ed8n0a+vevmQoRZJEd3Y1qXn2XHys0F6OHCC+VLENqNNZXdZE9E+b3FFW0lk49oLTzLRNIq 0wHeR1H54RffhLQAor2+4kSSu8mW5qB0n5Eb/zXJZZ/bRiXmT8kNg85UdYhvf03ZAsp3qxcr xMfMsC7m3+ADOtW90rNNLZnRvjhsYNrGIKH8Ub0UKXFXibHbafSuq7RqyRQzt01Ud8CAtq+w P9EftUysLtovGpLSpGDO5zQ++4ZGVygdYFr318aGDqCljKAKZ9hYgRimPBToDedho1S1uE6F 6YiBFnI3ry9+/KUnEP6L8Sfezwy7fp2JUNkUr41QF76nz43tl7oersrLxHzj2dYfWUAZWXva 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MIME-Version: 1.0 In-Reply-To: <20190530105043.29965-1-m.szyprowski@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > Reviewed-by: Krzysztof Kozlowski > Reviewed-by: Chanwoo Choi > --- Applied thanks! -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog