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=-5.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,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 69A68C388F9 for ; Wed, 11 Nov 2020 14:08:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 065B520795 for ; Wed, 11 Nov 2020 14:08:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="U9cD5jln" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727132AbgKKOIO (ORCPT ); Wed, 11 Nov 2020 09:08:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727123AbgKKOIL (ORCPT ); Wed, 11 Nov 2020 09:08:11 -0500 Received: from mail-lf1-x143.google.com (mail-lf1-x143.google.com [IPv6:2a00:1450:4864:20::143]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CE4EC0613D1; Wed, 11 Nov 2020 06:08:11 -0800 (PST) Received: by mail-lf1-x143.google.com with SMTP id a9so2311518lfh.2; Wed, 11 Nov 2020 06:08:11 -0800 (PST) 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=LHvXV2kmqfCvFfKCOYzmtXPEAteV60xqIVKGiujdMpY=; b=U9cD5jlnZqzk6ZCMmI2ELj+L2+qxFbClK/3/2fRC5UhG+8kSOaSIhEDeImnrtZ442B 4ehc0ZUi0WycwJd6FABCVOSUmCQIQJvaTRz3nTFEKZzMEy/GQVxE/teL37gy2EmbsnDY TLoaD4KbOM1SvFQdmTdpPhb1AJF21ZfAHLLQdLQmDZGXKVdKIqYkPN8kdsy0/rt0DCqi Ttv7PT+23g5FO7QLZPv8e8B5p/I38/sTTEFmOI9MddGrCIUJDDtc4x36pJ3XzktySr5F TSj8SkePimEGsCznB1AcTSHmkxBEabttgzce3OGZsGXN/v7vcmZTcyDNTmGVbnFaWRG1 hIpw== 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=LHvXV2kmqfCvFfKCOYzmtXPEAteV60xqIVKGiujdMpY=; b=PKZd6GC1N/RAgnlmGVLiQnv6nPUNL7d2bptOm8gCUIHpumFA4384WcZ1GmbK+OHl9M 5b+NXXkGPSSwCaGrusdyHDU/wWV0OjS3blzABHNbxP7VAVXjgr0n5vDekulU5aTdM1Ld mD/345TuY2G78oU0EcGu+4q8Eug3AmJ3Zmhm8EkeynSuUSqqr9VCmzQ7KhExbZc3PKJG K5c5sEVcUajDCvafgGLuUiiOyQ4kUjb16GR3ywFVWTzItSt3Pq/wtPXESoRIZWKZwCMN /RYWvoFpnFoChGxifqs9ZG+ZZYYcT04xMNBHYR/QMXXVdoTpk8FY4oPr4xvysBiB0Xj6 ueow== X-Gm-Message-State: AOAM532cce6rr6CIMYXAd3MsN6PASIgmlDGuTFMkYhEr3FJhQK9hMQz/ DWkEFWCu7UzyVrHMcSQrRxA= X-Google-Smtp-Source: ABdhPJyJuXZQ+wqXZ67sRla82+eaC3FA04CxCwIzaymyQabbK1aGONYj5LMmAEiiozxq/aRiBW7laA== X-Received: by 2002:a19:6551:: with SMTP id c17mr5471726lfj.46.1605103689744; Wed, 11 Nov 2020 06:08:09 -0800 (PST) Received: from [192.168.2.145] (109-252-193-159.dynamic.spd-mgts.ru. [109.252.193.159]) by smtp.googlemail.com with ESMTPSA id 136sm232266lfb.62.2020.11.11.06.08.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2020 06:08:08 -0800 (PST) Subject: Re: [PATCH v8 09/26] memory: tegra30: Support interconnect framework To: Viresh Kumar Cc: Thierry Reding , Jonathan Hunter , Georgi Djakov , Rob Herring , Michael Turquette , Stephen Boyd , Peter De Schrijver , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Mikko Perttunen , Viresh Kumar , Peter Geis , Nicolas Chauvet , Krzysztof Kozlowski , linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org References: <20201111011456.7875-1-digetx@gmail.com> <20201111011456.7875-10-digetx@gmail.com> <20201111055313.tefidnmc7f4yb3jk@vireshk-i7> <185e9140-fdce-29ef-68c3-aa7da02b249d@gmail.com> <20201111061855.2azilyhfoxwzpoir@vireshk-i7> <7f5c15c6-44d2-c997-442c-8f6670794f0e@gmail.com> <20201111075402.y52c2zwcw74eeyko@vireshk-i7> From: Dmitry Osipenko Message-ID: <406ecffe-6df5-0fbf-b608-606372ed95dc@gmail.com> Date: Wed, 11 Nov 2020 17:08:07 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <20201111075402.y52c2zwcw74eeyko@vireshk-i7> 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 11.11.2020 10:54, Viresh Kumar пишет: > On 11-11-20, 10:32, Dmitry Osipenko wrote: >> 11.11.2020 09:18, Viresh Kumar пишет: >>> On 11-11-20, 09:14, Dmitry Osipenko wrote: >>>> The dev_pm_opp_of_add_table() will produce a error message which doesn't >>>> give a clue about what's wrong, i.e. that device-tree needs to be updated. >>> >>> If you think that you need to print something more, then you can do >>> that in the error message you print when dev_pm_opp_of_add_table() >>> fails. I would suggest to drop this redundant check here. >>> >> >> Please give the rationale. > > The rationale is that the check is already performed by > dev_pm_opp_of_add_table() and it isn't going to add *any* benefit to > check it again here. Such a check for matching compatible platforms is > normally fine, but not for this. This is like open coding part of > dev_pm_opp_of_add_table(), and so is redundant. The > dev_pm_opp_of_add_table() helper also checks for OPPv1 bindings in the > DT (yes you won't be using them on your platform) and so relying on > that API is a better thing to do. > > As you already said, you just wanted a better print message and so you > have added this check. If you really care only about the print > message, then you can add a print of your choice in the driver but > otherwise this check is not going to benefit you much I am afraid. > > Having said that, this isn't the code I maintain. I need to guarantee > that the OPP core APIs are used properly and are not misused and so I > have a higher say there. But in this case all I can do is _suggest_ > and not enforce. And as I said earlier, I suggest to drop this > redundant check in order to make your code better and faster. > > Thanks. > I took a closer look and turned out that devm_pm_opp_of_add_table() silently returns -ENODEV if OPP is missing in a DT. Hence indeed it should be good to drop the property-check. I'll improve it in the next revision, thank you. 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=-4.8 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,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 37D24C2D0A3 for ; Thu, 12 Nov 2020 08:16:17 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 BF296221FB for ; Thu, 12 Nov 2020 08:16:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="U9cD5jln" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF296221FB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 991436E197; Thu, 12 Nov 2020 08:15:53 +0000 (UTC) Received: from mail-lf1-x143.google.com (mail-lf1-x143.google.com [IPv6:2a00:1450:4864:20::143]) by gabe.freedesktop.org (Postfix) with ESMTPS id C331D6E037 for ; Wed, 11 Nov 2020 14:08:11 +0000 (UTC) Received: by mail-lf1-x143.google.com with SMTP id e27so3301665lfn.7 for ; Wed, 11 Nov 2020 06:08:11 -0800 (PST) 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=LHvXV2kmqfCvFfKCOYzmtXPEAteV60xqIVKGiujdMpY=; b=U9cD5jlnZqzk6ZCMmI2ELj+L2+qxFbClK/3/2fRC5UhG+8kSOaSIhEDeImnrtZ442B 4ehc0ZUi0WycwJd6FABCVOSUmCQIQJvaTRz3nTFEKZzMEy/GQVxE/teL37gy2EmbsnDY TLoaD4KbOM1SvFQdmTdpPhb1AJF21ZfAHLLQdLQmDZGXKVdKIqYkPN8kdsy0/rt0DCqi Ttv7PT+23g5FO7QLZPv8e8B5p/I38/sTTEFmOI9MddGrCIUJDDtc4x36pJ3XzktySr5F TSj8SkePimEGsCznB1AcTSHmkxBEabttgzce3OGZsGXN/v7vcmZTcyDNTmGVbnFaWRG1 hIpw== 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=LHvXV2kmqfCvFfKCOYzmtXPEAteV60xqIVKGiujdMpY=; b=niHpFLxL3U8kyJ+mrbHC/M36dDrItFoht8PxA8a3xax8aJ0vPTvQ9fyQRSKGYq4SCh 6VERhThpzBFrEYbO+sy1g4EanlNsifvSTt2YwSRmfeegOelQLXV+/ezyM+DsW8fTRalC wDTbcr7qeLQeSbGrmEL0z6Rh/0Vt5UrhnC/j3grsfTxscuvc33lGOKEHagALbtR7VMt8 MonFGj3OoNmPrV8Z2KYVnfx5AKUYnN7fG/Wc4hcAeGTzylWKgO1Fb8u4FPz6DwmteIxu wf4/V6Sj8y2DDB2CbN5GqyCG82phq1ex5Cd3KOOXGycIfgAJj+TEYw0g4U0ZH/La7psZ 4JjQ== X-Gm-Message-State: AOAM532bskTVI+Y2OG/toG/R6W9VfBKGaXwJBPJDtfvmajjl/SjnR9dC 1B7UfImUFlOdXLuT8nthyafRW/yyttc= X-Google-Smtp-Source: ABdhPJyJuXZQ+wqXZ67sRla82+eaC3FA04CxCwIzaymyQabbK1aGONYj5LMmAEiiozxq/aRiBW7laA== X-Received: by 2002:a19:6551:: with SMTP id c17mr5471726lfj.46.1605103689744; Wed, 11 Nov 2020 06:08:09 -0800 (PST) Received: from [192.168.2.145] (109-252-193-159.dynamic.spd-mgts.ru. [109.252.193.159]) by smtp.googlemail.com with ESMTPSA id 136sm232266lfb.62.2020.11.11.06.08.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2020 06:08:08 -0800 (PST) Subject: Re: [PATCH v8 09/26] memory: tegra30: Support interconnect framework To: Viresh Kumar References: <20201111011456.7875-1-digetx@gmail.com> <20201111011456.7875-10-digetx@gmail.com> <20201111055313.tefidnmc7f4yb3jk@vireshk-i7> <185e9140-fdce-29ef-68c3-aa7da02b249d@gmail.com> <20201111061855.2azilyhfoxwzpoir@vireshk-i7> <7f5c15c6-44d2-c997-442c-8f6670794f0e@gmail.com> <20201111075402.y52c2zwcw74eeyko@vireshk-i7> From: Dmitry Osipenko Message-ID: <406ecffe-6df5-0fbf-b608-606372ed95dc@gmail.com> Date: Wed, 11 Nov 2020 17:08:07 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <20201111075402.y52c2zwcw74eeyko@vireshk-i7> Content-Language: en-US X-Mailman-Approved-At: Thu, 12 Nov 2020 08:15:51 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter De Schrijver , Krzysztof Kozlowski , Mikko Perttunen , dri-devel@lists.freedesktop.org, Nicolas Chauvet , Stephen Boyd , Viresh Kumar , Michael Turquette , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , Jonathan Hunter , Chanwoo Choi , Kyungmin Park , Thierry Reding , MyungJoo Ham , Peter Geis , linux-tegra@vger.kernel.org, Georgi Djakov Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" MTEuMTEuMjAyMCAxMDo1NCwgVmlyZXNoIEt1bWFyINC/0LjRiNC10YI6Cj4gT24gMTEtMTEtMjAs IDEwOjMyLCBEbWl0cnkgT3NpcGVua28gd3JvdGU6Cj4+IDExLjExLjIwMjAgMDk6MTgsIFZpcmVz aCBLdW1hciDQv9C40YjQtdGCOgo+Pj4gT24gMTEtMTEtMjAsIDA5OjE0LCBEbWl0cnkgT3NpcGVu a28gd3JvdGU6Cj4+Pj4gVGhlIGRldl9wbV9vcHBfb2ZfYWRkX3RhYmxlKCkgd2lsbCBwcm9kdWNl IGEgZXJyb3IgbWVzc2FnZSB3aGljaCBkb2Vzbid0Cj4+Pj4gZ2l2ZSBhIGNsdWUgYWJvdXQgd2hh dCdzIHdyb25nLCBpLmUuIHRoYXQgZGV2aWNlLXRyZWUgbmVlZHMgdG8gYmUgdXBkYXRlZC4KPj4+ Cj4+PiBJZiB5b3UgdGhpbmsgdGhhdCB5b3UgbmVlZCB0byBwcmludCBzb21ldGhpbmcgbW9yZSwg dGhlbiB5b3UgY2FuIGRvCj4+PiB0aGF0IGluIHRoZSBlcnJvciBtZXNzYWdlIHlvdSBwcmludCB3 aGVuIGRldl9wbV9vcHBfb2ZfYWRkX3RhYmxlKCkKPj4+IGZhaWxzLiBJIHdvdWxkIHN1Z2dlc3Qg dG8gZHJvcCB0aGlzIHJlZHVuZGFudCBjaGVjayBoZXJlLgo+Pj4KPj4KPj4gUGxlYXNlIGdpdmUg dGhlIHJhdGlvbmFsZS4KPiAKPiBUaGUgcmF0aW9uYWxlIGlzIHRoYXQgdGhlIGNoZWNrIGlzIGFs cmVhZHkgcGVyZm9ybWVkIGJ5Cj4gZGV2X3BtX29wcF9vZl9hZGRfdGFibGUoKSBhbmQgaXQgaXNu J3QgZ29pbmcgdG8gYWRkICphbnkqIGJlbmVmaXQgdG8KPiBjaGVjayBpdCBhZ2FpbiBoZXJlLiBT dWNoIGEgY2hlY2sgZm9yIG1hdGNoaW5nIGNvbXBhdGlibGUgcGxhdGZvcm1zIGlzCj4gbm9ybWFs bHkgZmluZSwgYnV0IG5vdCBmb3IgdGhpcy4gVGhpcyBpcyBsaWtlIG9wZW4gY29kaW5nIHBhcnQg b2YKPiBkZXZfcG1fb3BwX29mX2FkZF90YWJsZSgpLCBhbmQgc28gaXMgcmVkdW5kYW50LiBUaGUK PiBkZXZfcG1fb3BwX29mX2FkZF90YWJsZSgpIGhlbHBlciBhbHNvIGNoZWNrcyBmb3IgT1BQdjEg YmluZGluZ3MgaW4gdGhlCj4gRFQgKHllcyB5b3Ugd29uJ3QgYmUgdXNpbmcgdGhlbSBvbiB5b3Vy IHBsYXRmb3JtKSBhbmQgc28gcmVseWluZyBvbgo+IHRoYXQgQVBJIGlzIGEgYmV0dGVyIHRoaW5n IHRvIGRvLgo+IAo+IEFzIHlvdSBhbHJlYWR5IHNhaWQsIHlvdSBqdXN0IHdhbnRlZCBhIGJldHRl ciBwcmludCBtZXNzYWdlIGFuZCBzbyB5b3UKPiBoYXZlIGFkZGVkIHRoaXMgY2hlY2suIElmIHlv dSByZWFsbHkgY2FyZSBvbmx5IGFib3V0IHRoZSBwcmludAo+IG1lc3NhZ2UsIHRoZW4geW91IGNh biBhZGQgYSBwcmludCBvZiB5b3VyIGNob2ljZSBpbiB0aGUgZHJpdmVyIGJ1dAo+IG90aGVyd2lz ZSB0aGlzIGNoZWNrIGlzIG5vdCBnb2luZyB0byBiZW5lZml0IHlvdSBtdWNoIEkgYW0gYWZyYWlk Lgo+IAo+IEhhdmluZyBzYWlkIHRoYXQsIHRoaXMgaXNuJ3QgdGhlIGNvZGUgSSBtYWludGFpbi4g SSBuZWVkIHRvIGd1YXJhbnRlZQo+IHRoYXQgdGhlIE9QUCBjb3JlIEFQSXMgYXJlIHVzZWQgcHJv cGVybHkgYW5kIGFyZSBub3QgbWlzdXNlZCBhbmQgc28gSQo+IGhhdmUgYSBoaWdoZXIgc2F5IHRo ZXJlLiBCdXQgaW4gdGhpcyBjYXNlIGFsbCBJIGNhbiBkbyBpcyBfc3VnZ2VzdF8KPiBhbmQgbm90 IGVuZm9yY2UuIEFuZCBhcyBJIHNhaWQgZWFybGllciwgSSBzdWdnZXN0IHRvIGRyb3AgdGhpcwo+ IHJlZHVuZGFudCBjaGVjayBpbiBvcmRlciB0byBtYWtlIHlvdXIgY29kZSBiZXR0ZXIgYW5kIGZh c3Rlci4KPiAKPiBUaGFua3MuCj4gCgpJIHRvb2sgYSBjbG9zZXIgbG9vayBhbmQgdHVybmVkIG91 dCB0aGF0IGRldm1fcG1fb3BwX29mX2FkZF90YWJsZSgpCnNpbGVudGx5IHJldHVybnMgLUVOT0RF ViBpZiBPUFAgaXMgbWlzc2luZyBpbiBhIERULiBIZW5jZSBpbmRlZWQgaXQKc2hvdWxkIGJlIGdv b2QgdG8gZHJvcCB0aGUgcHJvcGVydHktY2hlY2suIEknbGwgaW1wcm92ZSBpdCBpbiB0aGUgbmV4 dApyZXZpc2lvbiwgdGhhbmsgeW91LgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVl ZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5m by9kcmktZGV2ZWwK