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 E8BB0ECE564 for ; Tue, 10 Sep 2024 09:57:56 +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=17B72M3HCY8s7ADeNYlT3I3PgTf1MqUYbCUE4ye+7ks=; b=PPBScKebWItKFYhZPdegnQ8Mxe wM8Aa6rAADEAt2ivYnwsjYLvci25r09t0HY/FAdZbSI9IQ9Cy+fOr6NWlbR8Z1UFIqnPJ+J91AsOd wG/CyNAEJcNt3TIGu5fPioXZFOv2IJmTBe1waXyr0cpBM0htDS+hQhD+L18PwqlbqudNJQkX+XwEe 3kNU0ouqknt+P5tVGaV6rGeujg5vl8xeEvuG7gTGPIfLf8YasC9fM/9HJKrYhx4KWgjhFQvq0NsQH IbZdSZyfvVK2D++rZEetOcLuWJ5vqo9uaNisEbC5uzNRRf8cQ6Pj2VzFuDYuxLVYoJyJWugE7Os5y P49pDZBQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1snxd5-000000057rh-44nh; Tue, 10 Sep 2024 09:57:47 +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 1snxc4-000000057e3-0HYn; Tue, 10 Sep 2024 09:56:45 +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 269DEC8A; Tue, 10 Sep 2024 11:55:25 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725962126; bh=cc6Sz69UTYW5ymqpxCaEr3bqwBpTbl/qddxLuUhbz10=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=HuwhF+tLPSfyV5u2CfcvJlTx6I7Ig8Z24I+E9PVLiqIA7+w+ULpXGjjOd3XV1AUBt IhT35+SYt4PEgN6TpjyEi/nFxamHLDNKJralo/N80Fofa0CJp8seNap7PUg7O0Y3Yu J0PzZlm5v0858Z64MV/xOltV0fheCL9Iu0y4G8lg= Message-ID: <49e375a3-d8e4-4b58-9456-1e6395b02a07@ideasonboard.com> Date: Tue, 10 Sep 2024 12:56:38 +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 , Sakari Ailus Cc: 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: <20240904-rp1-cfe-v4-3-f1b5b3d69c81@ideasonboard.com> <202409051822.ZzUGw3XQ-lkp@intel.com> <20240905111120.GK16183@pendragon.ideasonboard.com> <40cc1e95-b9fc-4c27-9428-1698d0bf9d25@ideasonboard.com> <763b3147-d7cb-44a7-b73b-8f7f4fd622ab@ideasonboard.com> <20240909134516.GA9448@pendragon.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_025644_288718_9197C2C1 X-CRM114-Status: GOOD ( 12.90 ) 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 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 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. And not related to the BE or CFE drivers, but it strikes me odd that to support PM and !PM we need to play with these tricks. I think the core should just do the right thing if the driver does pm_runtime_get_sync() even with !PM (although maybe the time has passed to be able to do that). Tomi