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Thu, 18 Jul 2019 18:57:43 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20190718095743epsmtip1b3f029b76eb5e619ca28169f19a51173~yd_kUvRsZ2451724517epsmtip1H; Thu, 18 Jul 2019 09:57:43 +0000 (GMT) Subject: Re: [PATCH v4 23/24] PM / devfreq: tegra30: Increase sampling period to 16ms To: Dmitry Osipenko , Thierry Reding , MyungJoo Ham , Kyungmin Park , Jonathan Hunter , Tomeu Vizoso Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org From: Chanwoo Choi Organization: Samsung Electronics Message-ID: <2dbe4ea5-13af-4b88-5539-b4a738f6fb1c@samsung.com> Date: Thu, 18 Jul 2019 19:00:53 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190707223303.6755-24-digetx@gmail.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLJsWRmVeSWpSXmKPExsWy7bCmnu4MJ4NYg/P7eCxWf3zMaNEyaxGL xdmmN+wWl3fNYbP43HuE0aLzyyw2i9uNK9gsfu6ax2LRt/YSmwOnx467Sxg9ds66y+7R2/yO zaNvyypGj8+b5AJYo7JtMlITU1KLFFLzkvNTMvPSbZW8g+Od403NDAx1DS0tzJUU8hJzU22V XHwCdN0yc4AOUlIoS8wpBQoFJBYXK+nb2RTll5akKmTkF5fYKqUWpOQUWBboFSfmFpfmpesl 5+daGRoYGJkCFSZkZ1y/upqp4ANHxYQLJ1gaGLvYuxg5OCQETCSWtkp1MXJxCAnsYJT4vukw axcjJ5DziVGieYIeROIbo8Tcaw1MIAmQhk1b/jFDFO1llPi72hzCfs8ocf4mJ4gtLBAucWl1 AxtIs4jAP0aJzp/NbCAJZoFIicM7V4MNYhPQktj/4gZYnF9AUeLqj8eMIDavgJ3ErZMnwGpY BFQlutu3gS0TFYiQOHVkHgtEjaDEyZlPwGxOATOJE9t2sEPMF5e49WQ+E4QtL9G8dTYzyBES Ar/ZJKbcbYP6wEVi7Z8uRghbWOLV8S3sELaUxOd3e9kg7GqJlSePsEE0dzBKbNl/gRUiYSyx f+lkJlDYMQtoSqzfpQ8RVpTY+XsuI8RiPol3X3tYIcHLK9HRJgRRoixx+cFdqBMkJRa3d7JN YFSaheSdWUhemIXkhVkIyxYwsqxiFEstKM5NTy02LDBEjutNjOCkqmW6g3HKOZ9DjAIcjEo8 vDeU9GOFWBPLiitzDzFKcDArifDefgkU4k1JrKxKLcqPLyrNSS0+xGgKDO2JzFKiyfnAhJ9X Em9oamRsbGxhYmhmamioJM47749mrJBAemJJanZqakFqEUwfEwenVAMjj3zH0/6/rsxLi3ir AnkXvvrF2+8aVZHS6zx1bl66e92/unbhY9/4rxUV/JBTfvro9jRLpso1vmrrohSv7p+y48q2 4kn9i3Y7Lfp86r7CNrHnXCoHX1nqeRTU62myLTy1V2/1BemFlwVEixd/WJf2m6f7d/jcnxs0 0ra4aJhWLG+viRaryLVSYinOSDTUYi4qTgQAmfqmKcADAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprFIsWRmVeSWpSXmKPExsWy7bCSnO50J4NYg21PdCxWf3zMaNEyaxGL xdmmN+wWl3fNYbP43HuE0aLzyyw2i9uNK9gsfu6ax2LRt/YSmwOnx467Sxg9ds66y+7R2/yO zaNvyypGj8+b5AJYo7hsUlJzMstSi/TtErgyrl9dzVTwgaNiwoUTLA2MXexdjJwcEgImEpu2 /GPuYuTiEBLYzSgxd/45VoiEpMS0i0eBEhxAtrDE4cPFEDVvGSX+vW0FiwsLhEvcPe8PEhcR aGKS2NR7AWwos0CkRM/cLWwQDVsYJVa+es4IkmAT0JLY/+IGG4jNL6AocfXHY7A4r4CdxK2T J5hAbBYBVYnu9m3MILaoQITEpGs7WSBqBCVOznwCZnMKmEmc2LYDapm6xJ95l5ghbHGJW0/m M0HY8hLNW2czT2AUnoWkfRaSlllIWmYhaVnAyLKKUTK1oDg3PbfYsMAoL7Vcrzgxt7g0L10v OT93EyM4xrS0djCeOBF/iFGAg1GJh/eGkn6sEGtiWXFl7iFGCQ5mJRHe2y+BQrwpiZVVqUX5 8UWlOanFhxilOViUxHnl849FCgmkJ5akZqemFqQWwWSZODilGhh53NPMn7TMWXFMacPs83vu P9Yx2m+j3/I/j5tVXmuumPmmxSqqjnnfz7kX/eeb2zGlOeiSzdsrPZ8E39iaLzvAte9T1z62 WScP51zaHyOpcuiF+I+vrlx8svfu9c8+nrKBJ5T90ieBesEXDVlTw6aUddjxVynOPHeWbW7E 263vDc/wBnW6C6YqsRRnJBpqMRcVJwIA2+3lVa0CAAA= X-CMS-MailID: 20190718095743epcas1p152702a3de7adce67a3744f339c303ab8 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20190707223611epcas1p47b94d7e80981515efcc4ef0d7b00733c References: <20190707223303.6755-1-digetx@gmail.com> <20190707223303.6755-24-digetx@gmail.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 19. 7. 8. 오전 7:33, Dmitry Osipenko wrote: > Increase sampling period by 4ms to get a nicer pow2 value, converting > diving into shifts in the code. That's more preferable for Tegra30 that > doesn't have hardware divider instructions because of older Cortex-A9 CPU. > In a result boosting events are delayed by 4ms, which is not sensible in > practice at all. > > Signed-off-by: Dmitry Osipenko > --- > drivers/devfreq/tegra30-devfreq.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c > index 19e872a64148..bde19b758643 100644 > --- a/drivers/devfreq/tegra30-devfreq.c > +++ b/drivers/devfreq/tegra30-devfreq.c > @@ -71,7 +71,7 @@ > * translates to 2 ^ (K_VAL + 1). ex: 2 ^ (6 + 1) = 128 > */ > #define ACTMON_AVERAGE_WINDOW_LOG2 6 > -#define ACTMON_SAMPLING_PERIOD 12 /* ms */ > +#define ACTMON_SAMPLING_PERIOD 16 /* ms */ > > #define KHZ 1000 > > Reviewed-by: Chanwoo Choi -- Best Regards, Chanwoo Choi Samsung Electronics