From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2CC7C28CC5 for ; Sat, 8 Jun 2019 10:43:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9E6972146E for ; Sat, 8 Jun 2019 10:43:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726692AbfFHKnu (ORCPT ); Sat, 8 Jun 2019 06:43:50 -0400 Received: from mout.kundenserver.de ([217.72.192.73]:41925 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726816AbfFHKnt (ORCPT ); Sat, 8 Jun 2019 06:43:49 -0400 Received: from [192.168.1.162] ([37.4.249.160]) by mrelayeu.kundenserver.de (mreue109 [212.227.15.183]) with ESMTPSA (Nemesis) id 1N0X4c-1gfNnc3WUe-00wRCN; Sat, 08 Jun 2019 12:43:24 +0200 Subject: Re: [PATCH v2 0/7] cpufreq support for Raspberry Pi To: Nicolas Saenz Julienne , linux-kernel@vger.kernel.org Cc: mbrugger@suse.de, viresh.kumar@linaro.org, rjw@rjwysocki.net, sboyd@kernel.org, eric@anholt.net, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, ptesarik@suse.com, linux-rpi-kernel@lists.infradead.org, ssuloev@orpaltech.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mturquette@baylibre.com, linux-pm@vger.kernel.org References: <20190606142255.29454-1-nsaenzjulienne@suse.de> From: Stefan Wahren Openpgp: preference=signencrypt Autocrypt: addr=stefan.wahren@i2se.com; keydata= xsFNBFt6gBMBEACub/pBevHxbvJefyZG32JINmn2bsEPX25V6fejmyYwmCGKjFtL/DoUMEVH DxCJ47BMXo344fHV1C3AnudgN1BehLoBtLHxmneCzgH3KcPtWW7ptj4GtJv9CQDZy27SKoEP xyaI8CF0ygRxJc72M9I9wmsPZ5bUHsLuYWMqQ7JcRmPs6D8gBkk+8/yngEyNExwxJpR1ylj5 bjxWDHyYQvuJ5LzZKuO9LB3lXVsc4bqXEjc6VFuZFCCk/syio/Yhse8N+Qsx7MQagz4wKUkQ QbfXg1VqkTnAivXs42VnIkmu5gzIw/0tRJv50FRhHhxpyKAI8B8nhN8Qvx7MVkPc5vDfd3uG YW47JPhVQBcUwJwNk/49F9eAvg2mtMPFnFORkWURvP+G6FJfm6+CvOv7YfP1uewAi4ln+JO1 g+gjVIWl/WJpy0nTipdfeH9dHkgSifQunYcucisMyoRbF955tCgkEY9EMEdY1t8iGDiCgX6s 50LHbi3k453uacpxfQXSaAwPksl8MkCOsv2eEr4INCHYQDyZiclBuuCg8ENbR6AGVtZSPcQb enzSzKRZoO9CaqID+favLiB/dhzmHA+9bgIhmXfvXRLDZze8po1dyt3E1shXiddZPA8NuJVz EIt2lmI6V8pZDpn221rfKjivRQiaos54TgZjjMYI7nnJ7e6xzwARAQABzSlTdGVmYW4gV2Fo cmVuIDxzdGVmYW4ud2FocmVuQGluLXRlY2guY29tPsLBdwQTAQgAIQUCXIdehwIbAwULCQgH AgYVCAkKCwIEFgIDAQIeAQIXgAAKCRCUgewPEZDy2yHTD/9UF7QlDkGxzQ7AaCI6N95iQf8/ 1oSUaDNu2Y6IK+DzQpb1TbTOr3VJwwY8a3OWz5NLSOLMWeVxt+osMmlQIGubD3ODZJ8izPlG /JrNt5zSdmN5IA5f3esWWQVKvghZAgTDqdpv+ZHW2EmxnAJ1uLFXXeQd3UZcC5r3/g/vSaMo 9xek3J5mNuDm71lEWsAs/BAcFc+ynLhxwBWBWwsvwR8bHtJ5DOMWvaKuDskpIGFUe/Kb2B+j ravQ3Tn6s/HqJM0cexSHz5pe+0sGvP+t9J7234BFQweFExriey8UIxOr4XAbaabSryYnU/zV H9U1i2AIQZMWJAevCvVgQ/U+NeRhXude9YUmDMDo2sB2VAFEAqiF2QUHPA2m8a7EO3yfL4rM k0iHzLIKvh6/rH8QCY8i3XxTNL9iCLzBWu/NOnCAbS+zlvLZaiSMh5EfuxTtv4PlVdEjf62P +ZHID16gUDwEmazLAMrx666jH5kuUCTVymbL0TvB+6L6ARl8ANyM4ADmkWkpyM22kCuISYAE fQR3uWXZ9YgxaPMqbV+wBrhJg4HaN6C6xTqGv3r4B2aqb77/CVoRJ1Z9cpHCwiOzIaAmvyzP U6MxCDXZ8FgYlT4v23G5imJP2zgX5s+F6ACUJ9UQPD0uTf+J9Da2r+skh/sWOnZ+ycoHNBQv ocZENAHQf87BTQRbeoATARAA2Hd0fsDVK72RLSDHby0OhgDcDlVBM2M+hYYpO3fX1r++shiq PKCHVAsQ5bxe7HmJimHa4KKYs2kv/mlt/CauCJ//pmcycBM7GvwnKzmuXzuAGmVTZC6WR5Lk akFrtHOzVmsEGpNv5Rc9l6HYFpLkbSkVi5SPQZJy+EMgMCFgjrZfVF6yotwE1af7HNtMhNPa LDN1oUKF5j+RyRg5iwJuCDknHjwBQV4pgw2/5vS8A7ZQv2MbW/TLEypKXif78IhgAzXtE2Xr M1n/o6ZH71oRFFKOz42lFdzdrSX0YsqXgHCX5gItLfqzj1psMa9o1eiNTEm1dVQrTqnys0l1 8oalRNswYlQmnYBwpwCkaTHLMHwKfGBbo5dLPEshtVowI6nsgqLTyQHmqHYqUZYIpigmmC3S wBWY1V6ffUEmkqpAACEnL4/gUgn7yQ/5d0seqnAq2pSBHMUUoCcTzEQUWVkiDv3Rk7hTFmhT sMq78xv2XRsXMR6yQhSTPFZCYDUExElEsSo9FWHWr6zHyYcc8qDLFvG9FPhmQuT2s9Blx6gI 323GnEq1lwWPJVzP4jQkJKIAXwFpv+W8CWLqzDWOvdlrDaTaVMscFTeH5W6Uprl65jqFQGMp cRGCs8GCUW13H0IyOtQtwWXA4ny+SL81pviAmaSXU8laKaRu91VOVaF9f4sAEQEAAcLBXwQY AQIACQUCW3qAEwIbDAAKCRCUgewPEZDy2+oXD/9cHHRkBZOfkmSq14Svx062PtU0KV470TSn p/jWoYJnKIw3G0mXIRgrtH2dPwpIgVjsYyRSVMKmSpt5ZrDf9NtTbNWgk8VoLeZzYEo+J3oP qFrTMs3aYYv7e4+JK695YnmQ+mOD9nia915tr5AZj95UfSTlyUmyic1d8ovsf1fP7XCUVRFc RjfNfDF1oL/pDgMP5GZ2OwaTejmyCuHjM8IR1CiavBpYDmBnTYk7Pthy6atWvYl0fy/CqajT Ksx7+p9xziu8ZfVX+iKBCc+He+EDEdGIDhvNZ/IQHfOB2PUXWGS+s9FNTxr/A6nLGXnA9Y6w 93iPdYIwxS7KXLoKJee10DjlzsYsRflFOW0ZOiSihICXiQV1uqM6tzFG9gtRcius5UAthWaO 1OwUSCQmfCOm4fvMIJIA9rxtoS6OqRQciF3crmo0rJCtN2awZfgi8XEif7d6hjv0EKM9XZoi AZYZD+/iLm5TaKWN6oGIti0VjJv8ZZOZOfCb6vqFIkJW+aOu4orTLFMz28aoU3QyWpNC8FFm dYsVua8s6gN1NIa6y3qa/ZB8bA/iky59AEz4iDIRrgUzMEg8Ak7Tfm1KiYeiTtBDCo25BvXj bqsyxkQD1nkRm6FAVzEuOPIe8JuqW2xD9ixGYvjU5hkRgJp3gP5b+cnG3LPqquQ2E6goKUML AQ== Message-ID: <7c51e65a-e84d-07fa-ac1e-0f34ecce887b@i2se.com> Date: Sat, 8 Jun 2019 12:43:18 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190606142255.29454-1-nsaenzjulienne@suse.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Provags-ID: V03:K1:oANPBkQ2KsQjlx8cfiyIC9oczC/QXncykGstAQioDeCodefMUV9 bW4wXsBgSWz/OzPocIRGDHXyqOHpejs3iBLEfZ1ysMEMLG/0kaPE7/Khly0eedgHYIPTEZf yAn4yAh5/U7XSgfKC5NsT3l8l9H6jk9lc+xGIH2b/WwOwnNvv5COr8VxqFRG/sH5DfMubph 0ZClOfJpLTbgWsboaqzFw== X-UI-Out-Filterresults: notjunk:1;V03:K0:u2UOTKSuFLE=:GinJCXRdmjhbj7l20EMK4B dfYA8BnBeUoi9dLijDSKMgCyb/lTAdw759WEYNfnavlB350IhLfmj3F3V17a7ZuuiX/F35Lx6 P02EzGJOHeXK65TfRc0/6BFjWR56+DhE2zumOZNV1XCx+hB4wzkx4OOhSxuP1jrCGEKU2IQ8x Zojuj0ImWp8XP34p/VM7jQHd8ArGy0IgZCBHrUy02bYL6UYh33EHWEDPWhSrrHL6OlZuWBOmQ Bi9O3Y9v2B+TvxW6NOvMsXEkxO1pN8ceNmAD2rotoOay1+MHP8cTsG0bdmtRBc/57vr+dJuEg k5lHbXA8NLoUR8R1HTSgRE158PZ5lnmEnbEbZjIv18Qtf1EFrbExgyFWXlyFMoOP8fnJPw19W HFfW3/kse0lEpZVXBqFWyvrEhW/oxFgJbxCxHJbW/BSoz8Bw9Q9HN/xPI6Bk+Gnkaxq4wzghw STWRL05mGK/Y7vQTyxX0MHcvbq4MdCRs/xU0sl6v4loBQ3syG5raEVlF3YBuRfhy1tuJpYHQM +/yw5cgyEtcPm9E3Z0D/zw7GN14zYKv6MHEyWfzzJJ7pGWgqq0vhCWNwRVJwJTLujwj5AuNgB wx75WreotJLxxAGgcqzggvhfyTRaszjG0TUgcGT17V7nK9UCCYI3rLCpGEV+vAcbJ84ewHENp XyHDRKpB4x6R/fF8wT3EyGrN4FdapZ4Jdm16tpnqxq0kHlNNzqWZ8ctsmnFCGY0sx3eczum+R a029FBQe7UzrnnjK0mPF7UAPznnIPdJyRAhGvziGXmwPpa67pGZ2uWcWppY= Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Am 06.06.19 um 16:22 schrieb Nicolas Saenz Julienne: > Hi all, > this aims at adding cpufreq support to the Raspberry Pi family of > boards. > > The series first factors out 'pllb' from clk-bcm2385 and creates a new > clk driver that operates it over RPi's firmware interface[1]. We are > forced to do so as the firmware 'owns' the pll and we're not allowed to > change through the register interface directly as we might race with the > over-temperature and under-voltage protections provided by the firmware. > > Next it creates a minimal cpufreq driver that populates the CPU's opp > table, and registers cpufreq-dt. Which is needed as the firmware > controls the max and min frequencies available. Here some figures from the Raspberry Pi 3 B+ as before/after comparison: Dhrystone Benchmark 2.1 A7 32 Bit  600 MHz, w/o Turbo (1): 1216.11 VAX MIPS 1400 MHz, w/o Turbo (2): 2839.67 VAX MIPS 1400 MHz, w   Turbo (3): 2839.45 VAX MIPS Whetstone Single Precision C Benchmark  vfpv4 32 Bit  600 MHz, w/o Turbo: 454.565 MWIPS 1400 MHz, w/o Turbo: 1062.494 MWIPS 1400 MHz, w   Turbo: 1061.723 MWIPS Power consumption (32 bit, without Ethernet) with load ( cat /dev/zero )  600 MHz, w/o Turbo: 2.48 W 1400 MHz, w/o Turbo: 3.2 W 1400 MHz, w   Turbo: 3.15 W Note 1: This is the maximum performance before enabling any cpufreq driver. Note 2: This is the maximum performance after enabling V2 of the cpufreq driver http://lists.infradead.org/pipermail/linux-arm-kernel/2019-June/657768.html Note 3: This is the maximum performance after enabling the initial cpufreq driver http://lists.infradead.org/pipermail/linux-rpi-kernel/2019-April/008634.html