From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A85AD2FAD for ; Wed, 18 Aug 2021 15:46:13 +0000 (UTC) Received: by mail-lf1-f44.google.com with SMTP id d4so5538066lfk.9 for ; Wed, 18 Aug 2021 08:46:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=JieIqWdhDDBOyoPQjj0L36XO6x8aJlMqSaMCMlfoZXA=; b=djv3Y4pk3V9YUhEA2+Gp7+1puSGj/ScHPzkFaChXRMQ9M5OMmulU1OjrBl8G1QZ+Sd u/OsC07L8kILBtvZw3VRSsYC2EFjSMQbF5wT+1yI9SCq0UfT2ra5mmwQLk71rDCt52ix +WGFoDUc0+yAkAosChOb9CVwlpU8GOJOVGPb6vn+ghBMisK2B72C3WCnuVO1CY4z0SFW dwbBRAzomUOkWquhEQgz6ZWmGjojVv1nYnUhIzdx0oQg23e6McWrhqImpDmmiXFwn1Ch axdy3S2COKId/VAFRe/Vw3Og9nEzScvpEh5CqOIRp3SqzrgDxkvcVltSFp1kEPyMrI3N dOrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=JieIqWdhDDBOyoPQjj0L36XO6x8aJlMqSaMCMlfoZXA=; b=r+iFDNJv4hp9f6nXLY1aZSlbZx78N3oonjTqkhwGnGILFlmt55o/qqdZtUQRbFXLyx azWEYZvxCvW3JI/8Ji0mgudr9uSRxWsDn3MNka2w/WlVTxrzAxuslXwF7+54P1H+YL4o POLLZC8KWsd4S3N1BKW43Qr9+XC4evfdCH1WD7/cbUGtcnwMHZ4mwBsdm+pKtN++QOtQ PQqZYGpBnXY2CaHIM7l7/DvCeqFZ2XGK/KZzkW1XTxz8rc/nAxxYxwj1vrOHpAynh9Bh incVn5nMx9orNQhVkfmxpNLYzMvHe4uhpA8xDrBZAJbqxq7CDcyJSISMRvXuh+s0WLTE k+jQ== X-Gm-Message-State: AOAM532bFgS0QczcUgXpOuoX58nJeHrxUJzhOIS8KIx4HS7t+CEjOBU0 zUV+A1+VnT5FNUBl31D8k1c= X-Google-Smtp-Source: ABdhPJyz6htisvp+J6/IItkzMKPUV9WFPIMTTkHzWeWJzG1OYk6xq6Q2Gi45+ssTCXzSje0g7I6JOg== X-Received: by 2002:a05:6512:45b:: with SMTP id y27mr6749279lfk.619.1629301571851; Wed, 18 Aug 2021 08:46:11 -0700 (PDT) Received: from [192.168.2.145] (46-138-85-91.dynamic.spd-mgts.ru. [46.138.85.91]) by smtp.googlemail.com with ESMTPSA id g27sm6017lfh.300.2021.08.18.08.46.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Aug 2021 08:46:11 -0700 (PDT) Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper From: Dmitry Osipenko To: Ulf Hansson , Viresh Kumar Cc: Thierry Reding , Jonathan Hunter , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Mark Brown , Lee Jones , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Nishanth Menon , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Adrian Hunter , Mauro Carvalho Chehab , Rob Herring , Michael Turquette , Linux Kernel Mailing List , linux-tegra , Linux PM , Linux USB List , linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc , Linux Media Mailing List , dri-devel , DTML , linux-clk References: <20210818043131.7klajx6drvvkftoc@vireshk-i7> <20210818045307.4brb6cafkh3adjth@vireshk-i7> <080469b3-612b-3a34-86e5-7037a64de2fe@gmail.com> <20210818055849.ybfajzu75ecpdrbn@vireshk-i7> <20210818062723.dqamssfkf7lf7cf7@vireshk-i7> <20210818091417.dvlnsxlgybdsn76x@vireshk-i7> <20210818095044.e2ntsm45h5cddk7s@vireshk-i7> <0354acbe-d856-4040-f453-8e8164102045@gmail.com> Message-ID: Date: Wed, 18 Aug 2021 18:46:10 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <0354acbe-d856-4040-f453-8e8164102045@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit 18.08.2021 18:43, Dmitry Osipenko пишет: > 18.08.2021 13:08, Ulf Hansson пишет: >> On Wed, 18 Aug 2021 at 11:50, Viresh Kumar wrote: >>> >>> On 18-08-21, 11:41, Ulf Hansson wrote: >>>> On Wed, 18 Aug 2021 at 11:14, Viresh Kumar wrote: >>>>> What we need here is just configure. So something like this then: >>>>> >>>>> - genpd->get_performance_state() >>>>> -> dev_pm_opp_get_current_opp() //New API >>>>> -> dev_pm_genpd_set_performance_state(dev, current_opp->pstate); >>>>> >>>>> This can be done just once from probe() then. >>>> >>>> How would dev_pm_opp_get_current_opp() work? Do you have a suggestion? >>> >>> The opp core already has a way of finding current OPP, that's what >>> Dmitry is trying to use here. It finds it using clk_get_rate(), if >>> that is zero, it picks the lowest freq possible. >>> >>>> I am sure I understand the problem. When a device is getting probed, >>>> it needs to consume power, how else can the corresponding driver >>>> successfully probe it? >>> >>> Dmitry can answer that better, but a device doesn't necessarily need >>> to consume energy in probe. It can consume bus clock, like APB we >>> have, but the more energy consuming stuff can be left disabled until >>> the time a user comes up. Probe will just end up registering the >>> driver and initializing it. >> >> That's perfectly fine, as then it's likely that it won't vote for an >> OPP, but can postpone that as well. >> >> Perhaps the problem is rather that the HW may already carry a non-zero >> vote made from a bootloader. If the consumer driver tries to clear >> that vote (calling dev_pm_opp_set_rate(dev, 0), for example), it would >> still not lead to any updates of the performance state in genpd, >> because genpd internally has initialized the performance-state to >> zero. > > We don't need to discover internal SoC devices because we use > device-tree on ARM. For most devices power isn't required at a probe > time because probe function doesn't touch h/w at all, thus devices are > left in suspended state after probe. > > We have three components comprising PM on Tegra: > > 1. Power gate > 2. Clock state > 3. Voltage state > > GENPD on/off represents the 'power gate'. > > Clock and reset are controlled by device drivers using clk and rst APIs. > > Voltage state is represented by GENPD's performance level. OPP framework couples the performance level with the clock rate. > GENPD core assumes that at a first rpm-resume of a consumer device, its > genpd_performance=0. Not true for Tegra because h/w of the device is > preconfigured to a non-zero perf level initially, h/w may not support > zero level at all. > > GENPD core assumes that consumer devices can work at any performance > level. Not true for Tegra because voltage needs to be set in accordance > to the clock rate before clock is enabled, otherwise h/w won't work > properly, perhaps clock may be unstable or h/w won't be latching. > > Performance level should be set to 0 while device is suspended. > Performance level needs to be bumped on rpm-resume of a device in > accordance to h/w state before hardware is enabled. > 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=-4.2 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 2F394C4338F for ; Wed, 18 Aug 2021 15:46:56 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E60246101A for ; Wed, 18 Aug 2021 15:46:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E60246101A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:References:Cc:To:From:Subject:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=B8wtRd5QXsAw9NiKmftWcQur0eRasEGtfuuowbl8his=; b=lzMvGtvmNP05tgP/YW/XPfXMnd lm1bdNhdmODE9VRoxmFRJQLgLcgY323BJ4JM3VQN6hfofNL8fhNJ7WV4yMiwv0nZmnHVrmHb5DFyR TtuQ3MNzqcTZFBCXSbn5s4xeYBOSp0VN7UWz1iHGtIQfU/funVOZwSiRA1VbdtPWjAEf/SDuwuKfi RWn96JyJhC/4dCgMWhLpsI3V2ETkFne6rppQV3v9gDEJmhPGaWlVgf2eKNRYsV9uILbnvzLfR5nIR 22C+xS1MYaCNG0KXC3wH4trJ3Q4jGnG4TE03sqc/rLqwv4Acwcido7mS/cXmTa2BI8H3+fmTt/K67 mtBgKA9g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mGNlh-0066Be-JV; Wed, 18 Aug 2021 15:46:17 +0000 Received: from mail-lf1-x129.google.com ([2a00:1450:4864:20::129]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mGNld-0066AN-EN for linux-mtd@lists.infradead.org; Wed, 18 Aug 2021 15:46:15 +0000 Received: by mail-lf1-x129.google.com with SMTP id y34so5550415lfa.8 for ; Wed, 18 Aug 2021 08:46:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=JieIqWdhDDBOyoPQjj0L36XO6x8aJlMqSaMCMlfoZXA=; b=djv3Y4pk3V9YUhEA2+Gp7+1puSGj/ScHPzkFaChXRMQ9M5OMmulU1OjrBl8G1QZ+Sd u/OsC07L8kILBtvZw3VRSsYC2EFjSMQbF5wT+1yI9SCq0UfT2ra5mmwQLk71rDCt52ix +WGFoDUc0+yAkAosChOb9CVwlpU8GOJOVGPb6vn+ghBMisK2B72C3WCnuVO1CY4z0SFW dwbBRAzomUOkWquhEQgz6ZWmGjojVv1nYnUhIzdx0oQg23e6McWrhqImpDmmiXFwn1Ch axdy3S2COKId/VAFRe/Vw3Og9nEzScvpEh5CqOIRp3SqzrgDxkvcVltSFp1kEPyMrI3N dOrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=JieIqWdhDDBOyoPQjj0L36XO6x8aJlMqSaMCMlfoZXA=; b=EcXhJ8YB2glgcqABXDgz3Hv0Fw0GpdcG55ZzAZRT9+CTmjpuz10nFOc0PjHKfZDR9v 59mSgzNRKg3FTzw06F5AHeM0uQDVV9N/oh6C2wZUZ2utvjX5s0s1chNj64W5xlWR1GBq viGT6XFqa6o+XYoDqB43ocTaZvl23iSCu61Ay70PHc64t2Qv0GEqyEjYgp4Gdsq2Xlt5 UCSScYrT+oq8rta8zVdgc7RX5DK6b3fBVrIIAv8XiKoiPv1hbjuRVPLvjNfhaaEo3OE3 91WmASRqUXasPXvQgrhmGGxTBCi7tTCg6UTe/N40tlr85PSlhDeWIFdNphfuJSIAnRIp lT7g== X-Gm-Message-State: AOAM5330/RhtJ12lqAtJAKiHmeT32Eai36cKM1r8nVsPDxb2L4tCtwza oVyFJ3mjxVZWkibb8YyqmnI= X-Google-Smtp-Source: ABdhPJyz6htisvp+J6/IItkzMKPUV9WFPIMTTkHzWeWJzG1OYk6xq6Q2Gi45+ssTCXzSje0g7I6JOg== X-Received: by 2002:a05:6512:45b:: with SMTP id y27mr6749279lfk.619.1629301571851; Wed, 18 Aug 2021 08:46:11 -0700 (PDT) Received: from [192.168.2.145] (46-138-85-91.dynamic.spd-mgts.ru. [46.138.85.91]) by smtp.googlemail.com with ESMTPSA id g27sm6017lfh.300.2021.08.18.08.46.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Aug 2021 08:46:11 -0700 (PDT) Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper From: Dmitry Osipenko To: Ulf Hansson , Viresh Kumar Cc: Thierry Reding , Jonathan Hunter , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Mark Brown , Lee Jones , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Nishanth Menon , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Adrian Hunter , Mauro Carvalho Chehab , Rob Herring , Michael Turquette , Linux Kernel Mailing List , linux-tegra , Linux PM , Linux USB List , linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc , Linux Media Mailing List , dri-devel , DTML , linux-clk References: <20210818043131.7klajx6drvvkftoc@vireshk-i7> 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