From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f175.google.com (mail-lj1-f175.google.com [209.85.208.175]) (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 A32032FB0 for ; Wed, 18 Aug 2021 04:12:07 +0000 (UTC) Received: by mail-lj1-f175.google.com with SMTP id d16so2572561ljq.4 for ; Tue, 17 Aug 2021 21:12:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=dMTTYDqSJMZu388pZDsE0iPTn5UycM6CSLQvWN7EXiM=; b=oQvzSg1jZXl+3O5uWNXSIj0EIiigE3D8tdhxfqAYJH6UqgsCzmL3hP6cSREL6xokAp 5KKoBF6NlIdSV51xYA8rOXF7SiPPUFEsJnNMVx/Mj1G+zfMpWhRPLIe9M8DhtO6iPc1S p2IPm0+QPqq1JCeEdyb3YV8sJWla7reBX08TZVdwmZTeasDkEcg8u8nsshUvr36URZPn TsiBBjquSJBmTUeTPM4bWFxBpZ+SJu/UDOougRzNQhHeIs1d4mB022t1K5UV5mIhOyHv D9ODeTS1/BkXQUvCftgq3yLT1B2G++QLewhjit+yDz2z/g1qknqoAwH4qRPZOYrgDn/j MmUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=dMTTYDqSJMZu388pZDsE0iPTn5UycM6CSLQvWN7EXiM=; b=oijK4CFU2m2IEhS1WqRXRSnK7RCT0fjVdPoYuct6iKRoXjkcmTY83128SfpFsfPFrM 90GwGViDVzh0k+YOMWFuf3AdInnytb65/heGN8ASSfBAltp2yD5Qf7B7Cg49YeCFaez0 1oTnPXmwcu+KEU9cs1KGnhQPQttnhufz+JL6q+adWwgwAwX79Co+a7tASWAJYBhv/qME dSLahq9HTAyITqRcwXJpgeg2hQH2tYF00pD1htyvqLNoj5WWsr6jhy/vUc0AU4Uat4/C FszPjWFHcZmKpTTsOab7hoDe7lL4GVrNBnfTaQ5fufGgdqfzVBTMh2lqt0qqikqynItG NVYg== X-Gm-Message-State: AOAM530MLVrNfjv5rziLX4y5gcbkwFdJ0wlC+06Ii577ZmQtroyTdFTt e4arnEY+jPXd1rqzEXWBhMY= X-Google-Smtp-Source: ABdhPJygrWrrk6YBOzsJmDVVKkQ3PCLKwObyA1oxnH+eZ3W64yk1hEef6yD4M/Yl5d3DG6PdHy9Hjg== X-Received: by 2002:a2e:9e8e:: with SMTP id f14mr5999025ljk.468.1629259925795; Tue, 17 Aug 2021 21:12:05 -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 m16sm373567lfh.243.2021.08.17.21.12.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Aug 2021 21:12:05 -0700 (PDT) Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper To: Viresh Kumar Cc: Thierry Reding , Jonathan Hunter , Ulf Hansson , 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@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org References: <20210817012754.8710-1-digetx@gmail.com> <20210817012754.8710-2-digetx@gmail.com> <20210817075515.vyyv7z37e6jcrhsl@vireshk-i7> <710261d9-7ae3-5155-c0a2-f8aed2408d0b@gmail.com> <20210818035533.ieqkexltfvvf2p4n@vireshk-i7> From: Dmitry Osipenko Message-ID: <5b2a80c1-9743-e633-6257-ede94c8a274c@gmail.com> Date: Wed, 18 Aug 2021 07:12:04 +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: <20210818035533.ieqkexltfvvf2p4n@vireshk-i7> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit 18.08.2021 06:55, Viresh Kumar пишет: > On 17-08-21, 18:49, Dmitry Osipenko wrote: >> 17.08.2021 10:55, Viresh Kumar пишет: >> ... >>>> +int dev_pm_opp_sync(struct device *dev) >>>> +{ >>>> + struct opp_table *opp_table; >>>> + struct dev_pm_opp *opp; >>>> + int ret = 0; >>>> + >>>> + /* Device may not have OPP table */ >>>> + opp_table = _find_opp_table(dev); >>>> + if (IS_ERR(opp_table)) >>>> + return 0; >>>> + >>>> + if (!_get_opp_count(opp_table)) >>>> + goto put_table; >>>> + >>>> + opp = _find_current_opp(dev, opp_table); >>>> + ret = _set_opp(dev, opp_table, opp, opp->rate); >>> >>> And I am not sure how this will end up working, since new OPP will be >>> equal to old one. Since I see you call this from resume() at many >>> places. >> >> Initially OPP table is "uninitialized" and opp_table->enabled=false, >> hence the first sync always works even if OPP is equal to old one. Once >> OPP has been synced, all further syncs are NO-OPs, hence it doesn't >> matter how many times syncing is called. >> >> https://elixir.bootlin.com/linux/v5.14-rc6/source/drivers/opp/core.c#L1012 > > Right, but how will this work from Resume ? Won't that be a no-op ? The first resume initializes the OPP state on sync, all further syncs on resume are no-ops. 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[46.138.85.91]) by smtp.googlemail.com with ESMTPSA id m16sm373567lfh.243.2021.08.17.21.12.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Aug 2021 21:12:05 -0700 (PDT) Subject: Re: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper To: Viresh Kumar Cc: Thierry Reding , Jonathan Hunter , Ulf Hansson , 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@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org References: <20210817012754.8710-1-digetx@gmail.com> <20210817012754.8710-2-digetx@gmail.com> <20210817075515.vyyv7z37e6jcrhsl@vireshk-i7> <710261d9-7ae3-5155-c0a2-f8aed2408d0b@gmail.com> <20210818035533.ieqkexltfvvf2p4n@vireshk-i7> From: Dmitry Osipenko Message-ID: <5b2a80c1-9743-e633-6257-ede94c8a274c@gmail.com> Date: Wed, 18 Aug 2021 07:12:04 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210818035533.ieqkexltfvvf2p4n@vireshk-i7> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210817_211207_453745_FEFE71BC X-CRM114-Status: GOOD ( 16.33 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org MTguMDguMjAyMSAwNjo1NSwgVmlyZXNoIEt1bWFyINC/0LjRiNC10YI6Cj4gT24gMTctMDgtMjEs IDE4OjQ5LCBEbWl0cnkgT3NpcGVua28gd3JvdGU6Cj4+IDE3LjA4LjIwMjEgMTA6NTUsIFZpcmVz aCBLdW1hciDQv9C40YjQtdGCOgo+PiAuLi4KPj4+PiAraW50IGRldl9wbV9vcHBfc3luYyhzdHJ1 Y3QgZGV2aWNlICpkZXYpCj4+Pj4gK3sKPj4+PiArCXN0cnVjdCBvcHBfdGFibGUgKm9wcF90YWJs ZTsKPj4+PiArCXN0cnVjdCBkZXZfcG1fb3BwICpvcHA7Cj4+Pj4gKwlpbnQgcmV0ID0gMDsKPj4+ PiArCj4+Pj4gKwkvKiBEZXZpY2UgbWF5IG5vdCBoYXZlIE9QUCB0YWJsZSAqLwo+Pj4+ICsJb3Bw X3RhYmxlID0gX2ZpbmRfb3BwX3RhYmxlKGRldik7Cj4+Pj4gKwlpZiAoSVNfRVJSKG9wcF90YWJs ZSkpCj4+Pj4gKwkJcmV0dXJuIDA7Cj4+Pj4gKwo+Pj4+ICsJaWYgKCFfZ2V0X29wcF9jb3VudChv cHBfdGFibGUpKQo+Pj4+ICsJCWdvdG8gcHV0X3RhYmxlOwo+Pj4+ICsKPj4+PiArCW9wcCA9IF9m aW5kX2N1cnJlbnRfb3BwKGRldiwgb3BwX3RhYmxlKTsKPj4+PiArCXJldCA9IF9zZXRfb3BwKGRl diwgb3BwX3RhYmxlLCBvcHAsIG9wcC0+cmF0ZSk7Cj4+Pgo+Pj4gQW5kIEkgYW0gbm90IHN1cmUg aG93IHRoaXMgd2lsbCBlbmQgdXAgd29ya2luZywgc2luY2UgbmV3IE9QUCB3aWxsIGJlCj4+PiBl cXVhbCB0byBvbGQgb25lLiBTaW5jZSBJIHNlZSB5b3UgY2FsbCB0aGlzIGZyb20gcmVzdW1lKCkg YXQgbWFueQo+Pj4gcGxhY2VzLgo+Pgo+PiBJbml0aWFsbHkgT1BQIHRhYmxlIGlzICJ1bmluaXRp YWxpemVkIiBhbmQgb3BwX3RhYmxlLT5lbmFibGVkPWZhbHNlLAo+PiBoZW5jZSB0aGUgZmlyc3Qg c3luYyBhbHdheXMgd29ya3MgZXZlbiBpZiBPUFAgaXMgZXF1YWwgdG8gb2xkIG9uZS4gT25jZQo+ PiBPUFAgaGFzIGJlZW4gc3luY2VkLCBhbGwgZnVydGhlciBzeW5jcyBhcmUgTk8tT1BzLCBoZW5j ZSBpdCBkb2Vzbid0Cj4+IG1hdHRlciBob3cgbWFueSB0aW1lcyBzeW5jaW5nIGlzIGNhbGxlZC4K Pj4KPj4gaHR0cHM6Ly9lbGl4aXIuYm9vdGxpbi5jb20vbGludXgvdjUuMTQtcmM2L3NvdXJjZS9k cml2ZXJzL29wcC9jb3JlLmMjTDEwMTIKPiAKPiBSaWdodCwgYnV0IGhvdyB3aWxsIHRoaXMgd29y ayBmcm9tIFJlc3VtZSA/IFdvbid0IHRoYXQgYmUgYSBuby1vcCA/CgpUaGUgZmlyc3QgcmVzdW1l IGluaXRpYWxpemVzIHRoZSBPUFAgc3RhdGUgb24gc3luYywgYWxsIGZ1cnRoZXIgc3luY3Mgb24K cmVzdW1lIGFyZSBuby1vcHMuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KTGludXggTVREIGRpc2N1c3Npb24gbWFpbGluZyBsaXN0Cmh0dHA6 Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtbXRkLwo=