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[109.252.193.186]) by smtp.googlemail.com with ESMTPSA id v3sm769788lfa.211.2020.10.25.09.29.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 25 Oct 2020 09:29:33 -0700 (PDT) Subject: Re: [PATCH v5 1/2] PM / devfreq: Add governor feature flag To: Chanwoo Choi , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org Cc: lukasz.luba@arm.com, enric.balletbo@collabora.com, hl@rock-chips.com, thierry.reding@gmail.com, jonathanh@nvidia.com, abel.vesa@nxp.com, k.konieczny@samsung.com, b.zolnierkie@samsung.com, chanwoo@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com References: <20201023102632.740-1-cw00.choi@samsung.com> <20201023102632.740-2-cw00.choi@samsung.com> From: Dmitry Osipenko Message-ID: <622cd840-0b09-e377-fbff-dd3e8ef0ff4e@gmail.com> Date: Sun, 25 Oct 2020 19:29:32 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201023102632.740-2-cw00.choi@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 23.10.2020 13:26, Chanwoo Choi пишет: > The devfreq governor is able to have the specific flag as follows > in order to implement the specific feature. For example, devfreq allows > user to change the governors on runtime via sysfs interface. > But, if devfreq device uses 'passive' governor, don't allow user to change > the governor. For this case, define the DEVFREQ_GOV_FLAG_IMMUTABLE > and set it to flag of passive governor. > > [Definition for governor flag] > - DEVFREQ_GOV_FLAG_IMMUTABLE > : If immutable flag is set, governor is never changeable to other governors. > - DEVFREQ_GOV_FLAG_IRQ_DRIVEN > : Devfreq core won't schedule polling work for this governor if value is set. > > [Table of governor flag for devfreq governors] > ------------------------------------------------------------------------------ > | simple | perfor | power | user | passive | tegra30 > | ondemand | mance | save | space| | > ------------------------------------------------------------------------------ > immutable | X | X | X | X | O | O > interrupt_driven | X(polling)| X | X | X | X | O (irq) > ------------------------------------------------------------------------------ > > Signed-off-by: Chanwoo Choi > --- Reviewed-by: Dmitry Osipenko Tested-by: Dmitry Osipenko