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([2a01:e0a:982:cbb0:fcee:f026:296d:135f]) by smtp.gmail.com with ESMTPSA id fm8-20020a05600c0c0800b0040ef718cf81sm9146044wmb.28.2024.02.12.07.02.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Feb 2024 07:02:50 -0800 (PST) Message-ID: <34ee9676-567f-4c07-83b0-f3b8b1e08db9@linaro.org> Date: Mon, 12 Feb 2024 16:02:49 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: neil.armstrong@linaro.org Subject: Re: [PATCH v1 2/2] arm64: dts: amlogic: axg: initialize default SoC capacitance Content-Language: en-US, fr To: Dmitry Rokosov , jbrunet@baylibre.com, mturquette@baylibre.com, adeep@lexina.in, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, khilman@baylibre.com, martin.blumenstingl@googlemail.com, conor+dt@kernel.org Cc: kernel@sberdevices.ru, sdfw_system_team@sberdevices.ru, rockosov@gmail.com, linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20240209212816.11187-1-ddrokosov@salutedevices.com> <20240209212816.11187-3-ddrokosov@salutedevices.com> Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro Developer Services In-Reply-To: <20240209212816.11187-3-ddrokosov@salutedevices.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240212_070252_431665_D8C2FAFB X-CRM114-Status: GOOD ( 16.21 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 09/02/2024 22:28, Dmitry Rokosov wrote: > The capacitance value is required for the usage of the cpufreq cooling > device and power_allocator thermal governor in the appropriate energy > model. > > It helps to compute the power estimated by the SoC at the appropriate > frequency. If it is the frequency of an existing OPP, or at the > frequency of the first OPP above the requested value otherwise. > > The power is estimated as P = C * V^2 * f, with C being the SoC's > capacitance and V and f respectively representing the voltage and > frequency of the OPP. > > Since AXG SoC doesn't have SCMI protocol support, we need to initialize > capacitance using the 'dynamic-power-coefficient' DT entry. Its value is > retrieved from the vendor kernel, and it gives us the following > freq2power mapping: > +-----------+--------+ > | frequency,| power, | > | MHz | uW | > +-----------+--------+ > | 100 | 10354 | > +-----------+--------+ > | 250 | 27104 | > +-----------+--------+ > | 500 | 55447 | > +-----------+--------+ > | 667 | 77327 | > +-----------+--------+ > | 1000 | 129024 | > +-----------+--------+ > | 1200 | 164656 | > +-----------+--------+ > | 1296 | 192489 | > +-----------+--------+ > | 1416 | 239870 | > +-----------+--------+ > > Signed-off-by: Dmitry Rokosov > --- > arch/arm64/boot/dts/amlogic/meson-axg.dtsi | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi > index ea96fef328e8..6d12b760b90f 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi > +++ b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi > @@ -74,6 +74,7 @@ cpu0: cpu@0 { > enable-method = "psci"; > next-level-cache = <&l2>; > clocks = <&scpi_dvfs 0>; > + dynamic-power-coefficient = <140>; > #cooling-cells = <2>; > }; > > @@ -84,6 +85,7 @@ cpu1: cpu@1 { > enable-method = "psci"; > next-level-cache = <&l2>; > clocks = <&scpi_dvfs 0>; > + dynamic-power-coefficient = <140>; > #cooling-cells = <2>; > }; > > @@ -94,6 +96,7 @@ cpu2: cpu@2 { > enable-method = "psci"; > next-level-cache = <&l2>; > clocks = <&scpi_dvfs 0>; > + dynamic-power-coefficient = <140>; > #cooling-cells = <2>; > }; > > @@ -104,6 +107,7 @@ cpu3: cpu@3 { > enable-method = "psci"; > next-level-cache = <&l2>; > clocks = <&scpi_dvfs 0>; > + dynamic-power-coefficient = <140>; > #cooling-cells = <2>; > }; > Reviewed-by: Neil Armstrong _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic