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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 314F1ECE564 for ; Tue, 10 Sep 2024 10:29:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=4bLQGBewMUZB/c5zGglpFztvnxHnUMk6lsU2CR5ULbg=; b=VRaB+yHEo8Ct6E2N9S4gwisQ8s 3P1sGx0WY/xQ6ZaJjujmN4pJjOYppkC/fPwElGT/ePMys/ZZnN/aDeUZRf9f7dwz+eZOe7lrMIKuR pCplJ3qJTmjMvEP5GH39RIv4rxUugbanlBjKkrwyJmMFksbfhcqz7lU6212iD4Zi+8h8888HRqtGB lIwFEsckQqrA8T3V4w323o81Lw5HRTmj7P6pecwNvVgCX9+QC0SAn+g8g7QYHh0/1T3M9fjMFtOBD PhYDOphe0ZvbEq520jFqIn8ryx7HZ2hsKYp0dKQuLaNbftYJu+MKNWccXtRewFl8VT1iJI0z5DIjE 1dTb47wQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sny7z-00000005Eft-3m4A; Tue, 10 Sep 2024 10:29:43 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sny6x-00000005EVE-1KTF; Tue, 10 Sep 2024 10:28:40 +0000 Received: from [192.168.88.20] (91-156-87-48.elisa-laajakaista.fi [91.156.87.48]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 1CF8963F; Tue, 10 Sep 2024 12:27:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725964041; bh=XEbWh0WLTjphokKQvSyqZ5V9lRpdsA8yoA26gsUttoE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=oWj863ObnL3xJ9uh+dJCkvaW6PZhBnORGQYlSRfFaYyoRQWJXorRg7vOwqn+xTkt7 2qm3jogfTQ+O2cWjCxeEeDKN25fkRS2cNpCOGZ0xhCufOlP2RdJ9zaPVL2M1cknMXY cwpkO7AmFeDOYFzqyWccJ3UadHrRNtNaulBHiSAs= Message-ID: <2e9a8d32-1f30-4623-b420-44dfc76c1ef0@ideasonboard.com> Date: Tue, 10 Sep 2024 13:28:34 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/4] media: raspberrypi: Add support for RP1-CFE To: Jacopo Mondi Cc: Sakari Ailus , Laurent Pinchart , Mauro Carvalho Chehab , Raspberry Pi Kernel Maintenance , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , oe-kbuild-all@lists.linux.dev, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Naushir Patuck , Kieran Bingham , kernel test robot References: <20240905111120.GK16183@pendragon.ideasonboard.com> <40cc1e95-b9fc-4c27-9428-1698d0bf9d25@ideasonboard.com> <763b3147-d7cb-44a7-b73b-8f7f4fd622ab@ideasonboard.com> <20240909134516.GA9448@pendragon.ideasonboard.com> <49e375a3-d8e4-4b58-9456-1e6395b02a07@ideasonboard.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240910_032839_532602_C27F4606 X-CRM114-Status: GOOD ( 21.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/09/2024 13:18, Jacopo Mondi wrote: > Hi Tomi > > On Tue, Sep 10, 2024 at 12:56:38PM GMT, Tomi Valkeinen wrote: >> On 10/09/2024 12:19, Jacopo Mondi wrote: >> >>> However, I think this current patch is correct (assuming the above >>> reasoning on i2c sensor drivers is correct) and doesn't require >>> CONFIG_PM, so I would be tempted to keep this version. >> >> I think the existence of this discussion alone proves my point that we >> should only support PM-case, unless !PM is a requirement =). >> >> But if you do want to keep !PM: >> >> Is there a reason why not mark the device as active with >> pm_runtime_set_active() after calling pispbe_runtime_resume and before > > cargo-cult ? > >> accessing the device? That feels like the most logical way to use the >> function, and it would be right regardless whether the core will enable the >> parents before probe() or not. > > Possibly more accurate, but there's no guarantee it's correct. The > peripheral might have requirements on the clock or power rails > enablement order and some might be managed by the parent. I know we're > talking hypothesis but my point is that there's not correctness > guarantee we can enforce unless the parent is powered up when the > device probes ? > > Anyway, I'll defer the call to the group: either keep the patch as it > is right now on the list, or go full runtime_pm. I understand there is > no reason to care about !CONFIG_PM but somehow I feel "bad" in listing > it as a dependency if the peripheral can actually work without it. > Maybe I should just ignore that feeling ? The runtime PM is just a software construct, so all peripherals can work without it. I decided to ignore the feeling, very much based on this thread, and sent CFE v5 with it depending on PM. Tomi