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 AFDCDECE579 for ; Mon, 9 Sep 2024 10:05:57 +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=7JZDDq1Ka/fc/cFLBdldI8F5ukKOlth6vlTz3FeFMYw=; b=whzEJyXfgEheMiRaM1aJivWcpk ugak3eqCmN4CUkHuP036I9Ukkn6+xLT5Wh37FXmkPwIEePXNkk8O7czxg2I+BugzYTUkmaEWfyzP6 uqjI6OMVutMBIwlAJNNCzozGCOQkWvvXUQwnSSoMrusGcNOapUs/zbulqgd+X/3UoXmPQSyOn7fYW F3kHM+GjA3nzt5fs2GijSIADqsHwFiY1CWGkacWFGMSuMXYGQ5vaqH0i9/ADmnhxsqnMK4Q66cxNZ Y+UJj6Fy7WdWnhI/ZUiOWvxy7iJXHir8it2qe/b5SjMGcSZseWwOI6Qc3QQslLi18N8N3UO8ZaBzG LymjgJLg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1snbHG-00000001RJn-042j; Mon, 09 Sep 2024 10:05:46 +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 1snbGD-00000001R1D-2M4f; Mon, 09 Sep 2024 10:04:43 +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 8A9FE2C6; Mon, 9 Sep 2024 12:03:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725876203; bh=ymRc9T1231dcpqjjn5AU9XZ6RS59mvxlxY50H0r1sMc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Eh916ok5NX/vL63O8nGjfIuAwt3XJHFVB987787s8Ir4hZ+4ILkFrWyU5n/jOHdAC WjXj1dhhtMQuWBHKa2dhIp0rc8kaMtd7EhkjCKngk86cc42OUlPNchtPcvZHgpphey /kv6V7O/jbiHfrGdmZ3Ap0IaCXq3nKQkSU+vOsvY= Message-ID: Date: Mon, 9 Sep 2024 13:04:35 +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: 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 , Sakari Ailus , 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> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; keydata= xsFNBE6ms0cBEACyizowecZqXfMZtnBniOieTuFdErHAUyxVgtmr0f5ZfIi9Z4l+uUN4Zdw2 wCEZjx3o0Z34diXBaMRJ3rAk9yB90UJAnLtb8A97Oq64DskLF81GCYB2P1i0qrG7UjpASgCA Ru0lVvxsWyIwSfoYoLrazbT1wkWRs8YBkkXQFfL7Mn3ZMoGPcpfwYH9O7bV1NslbmyJzRCMO eYV258gjCcwYlrkyIratlHCek4GrwV8Z9NQcjD5iLzrONjfafrWPwj6yn2RlL0mQEwt1lOvn LnI7QRtB3zxA3yB+FLsT1hx0va6xCHpX3QO2gBsyHCyVafFMrg3c/7IIWkDLngJxFgz6DLiA G4ld1QK/jsYqfP2GIMH1mFdjY+iagG4DqOsjip479HCWAptpNxSOCL6z3qxCU8MCz8iNOtZk DYXQWVscM5qgYSn+fmMM2qN+eoWlnCGVURZZLDjg387S2E1jT/dNTOsM/IqQj+ZROUZuRcF7 0RTtuU5q1HnbRNwy+23xeoSGuwmLQ2UsUk7Q5CnrjYfiPo3wHze8avK95JBoSd+WIRmV3uoO rXCoYOIRlDhg9XJTrbnQ3Ot5zOa0Y9c4IpyAlut6mDtxtKXr4+8OzjSVFww7tIwadTK3wDQv Bus4jxHjS6dz1g2ypT65qnHen6mUUH63lhzewqO9peAHJ0SLrQARAQABzTBUb21pIFZhbGtl aW5lbiA8dG9taS52YWxrZWluZW5AaWRlYXNvbmJvYXJkLmNvbT7CwY4EEwEIADgWIQTEOAw+ ll79gQef86f6PaqMvJYe9QUCX/HruAIbAwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRD6 PaqMvJYe9WmFD/99NGoD5lBJhlFDHMZvO+Op8vCwnIRZdTsyrtGl72rVh9xRfcSgYPZUvBuT VDxE53mY9HaZyu1eGMccYRBaTLJSfCXl/g317CrMNdY0k40b9YeIX10feiRYEWoDIPQ3tMmA 0nHDygzcnuPiPT68JYZ6tUOvAt7r6OX/litM+m2/E9mtp8xCoWOo/kYO4mOAIoMNvLB8vufi uBB4e/AvAjtny4ScuNV5c5q8MkfNIiOyag9QCiQ/JfoAqzXRjVb4VZG72AKaElwipiKCWEcU R4+Bu5Qbaxj7Cd36M/bI54OrbWWETJkVVSV1i0tghCd6HHyquTdFl7wYcz6cL1hn/6byVnD+ sR3BLvSBHYp8WSwv0TCuf6tLiNgHAO1hWiQ1pOoXyMEsxZlgPXT+wb4dbNVunckwqFjGxRbl Rz7apFT/ZRwbazEzEzNyrBOfB55xdipG/2+SmFn0oMFqFOBEszXLQVslh64lI0CMJm2OYYe3 PxHqYaztyeXsx13Bfnq9+bUynAQ4uW1P5DJ3OIRZWKmbQd/Me3Fq6TU57LsvwRgE0Le9PFQs dcP2071rMTpqTUteEgODJS4VDf4lXJfY91u32BJkiqM7/62Cqatcz5UWWHq5xeF03MIUTqdE qHWk3RJEoWHWQRzQfcx6Fn2fDAUKhAddvoopfcjAHfpAWJ+ENc7BTQROprNHARAAx0aat8GU hsusCLc4MIxOQwidecCTRc9Dz/7U2goUwhw2O5j9TPqLtp57VITmHILnvZf6q3QAho2QMQyE DDvHubrdtEoqaaSKxKkFie1uhWNNvXPhwkKLYieyL9m2JdU+b88HaDnpzdyTTR4uH7wk0bBa KbTSgIFDDe5lXInypewPO30TmYNkFSexnnM3n1PBCqiJXsJahE4ZQ+WnV5FbPUj8T2zXS2xk 0LZ0+DwKmZ0ZDovvdEWRWrz3UzJ8DLHb7blPpGhmqj3ANXQXC7mb9qJ6J/VSl61GbxIO2Dwb xPNkHk8fwnxlUBCOyBti/uD2uSTgKHNdabhVm2dgFNVuS1y3bBHbI/qjC3J7rWE0WiaHWEqy UVPk8rsph4rqITsj2RiY70vEW0SKePrChvET7D8P1UPqmveBNNtSS7In+DdZ5kUqLV7rJnM9 /4cwy+uZUt8cuCZlcA5u8IsBCNJudxEqBG10GHg1B6h1RZIz9Q9XfiBdaqa5+CjyFs8ua01c 9HmyfkuhXG2OLjfQuK+Ygd56mV3lq0aFdwbaX16DG22c6flkkBSjyWXYepFtHz9KsBS0DaZb 4IkLmZwEXpZcIOQjQ71fqlpiXkXSIaQ6YMEs8WjBbpP81h7QxWIfWtp+VnwNGc6nq5IQDESH mvQcsFS7d3eGVI6eyjCFdcAO8eMAEQEAAcLBXwQYAQIACQUCTqazRwIbDAAKCRD6PaqMvJYe 9fA7EACS6exUedsBKmt4pT7nqXBcRsqm6YzT6DeCM8PWMTeaVGHiR4TnNFiT3otD5UpYQI7S suYxoTdHrrrBzdlKe5rUWpzoZkVK6p0s9OIvGzLT0lrb0HC9iNDWT3JgpYDnk4Z2mFi6tTbq xKMtpVFRA6FjviGDRsfkfoURZI51nf2RSAk/A8BEDDZ7lgJHskYoklSpwyrXhkp9FHGMaYII m9EKuUTX9JPDG2FTthCBrdsgWYPdJQvM+zscq09vFMQ9Fykbx5N8z/oFEUy3ACyPqW2oyfvU CH5WDpWBG0s5BALp1gBJPytIAd/pY/5ZdNoi0Cx3+Z7jaBFEyYJdWy1hGddpkgnMjyOfLI7B CFrdecTZbR5upjNSDvQ7RG85SnpYJTIin+SAUazAeA2nS6gTZzumgtdw8XmVXZwdBfF+ICof 92UkbYcYNbzWO/GHgsNT1WnM4sa9lwCSWH8Fw1o/3bX1VVPEsnESOfxkNdu+gAF5S6+I6n3a ueeIlwJl5CpT5l8RpoZXEOVtXYn8zzOJ7oGZYINRV9Pf8qKGLf3Dft7zKBP832I3PQjeok7F yjt+9S+KgSFSHP3Pa4E7lsSdWhSlHYNdG/czhoUkSCN09C0rEK93wxACx3vtxPLjXu6RptBw 3dRq7n+mQChEB1am0BueV1JZaBboIL0AGlSJkm23kw== In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240909_030441_765270_10544DB3 X-CRM114-Status: GOOD ( 26.87 ) 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 09/09/2024 12:13, Jacopo Mondi wrote: > Hi Tomi > > On Mon, Sep 09, 2024 at 08:22:59AM GMT, Tomi Valkeinen wrote: >> Hi Laurent, Jacopo, >> >> On 09/09/2024 08:08, Tomi Valkeinen wrote: >>> Hi, >>> >>> On 05/09/2024 14:11, Laurent Pinchart wrote: >>>> On Thu, Sep 05, 2024 at 06:50:48PM +0800, kernel test robot wrote: >>>>> Hi Tomi, >>>>> >>>>> kernel test robot noticed the following build warnings: >>>>> >>>>> [auto build test WARNING on 431c1646e1f86b949fa3685efc50b660a364c2b6] >>>>> >>>>> url:    https://github.com/intel-lab-lkp/linux/commits/Tomi- >>>>> Valkeinen/media-uapi-Add-meta-formats-for-PiSP-FE-config-and- >>>>> stats/20240904-192729 >>>>> base:   431c1646e1f86b949fa3685efc50b660a364c2b6 >>>>> patch link:    https://lore.kernel.org/r/20240904-rp1-cfe-v4-3- >>>>> f1b5b3d69c81%40ideasonboard.com >>>>> patch subject: [PATCH v4 3/4] media: raspberrypi: Add support >>>>> for RP1-CFE >>>>> config: m68k-allmodconfig (https://download.01.org/0day-ci/ >>>>> archive/20240905/202409051822.ZzUGw3XQ-lkp@intel.com/config) >>>>> compiler: m68k-linux-gcc (GCC) 14.1.0 >>>>> reproduce (this is a W=1 build): >>>>> (https://download.01.org/0day-ci/ >>>>> archive/20240905/202409051822.ZzUGw3XQ-lkp@intel.com/reproduce) >>>>> >>>>> If you fix the issue in a separate patch/commit (i.e. not just a >>>>> new version of >>>>> the same patch/commit), kindly add following tags >>>>> | Reported-by: kernel test robot >>>>> | Closes: https://lore.kernel.org/oe-kbuild- >>>>> all/202409051822.ZzUGw3XQ-lkp@intel.com/ >>>>> >>>>> All warnings (new ones prefixed by >>): >>>>> >>>>>>> drivers/media/platform/raspberrypi/rp1-cfe/cfe.c:2445:12: >>>>>>> warning: 'cfe_runtime_resume' defined but not used >>>>>>> [-Wunused-function] >>>>>      2445 | static int cfe_runtime_resume(struct device *dev) >>>>>           |            ^~~~~~~~~~~~~~~~~~ >>>>>>> drivers/media/platform/raspberrypi/rp1-cfe/cfe.c:2435:12: >>>>>>> warning: 'cfe_runtime_suspend' defined but not used >>>>>>> [-Wunused-function] >>>>>      2435 | static int cfe_runtime_suspend(struct device *dev) >>>>>           |            ^~~~~~~~~~~~~~~~~~~ >>>>> vim +/cfe_runtime_resume +2445 >>>>> drivers/media/platform/raspberrypi/ rp1-cfe/cfe.c >>>> >>>> The recommended way to fix this is to switch from SET_RUNTIME_PM_OPS() >>>> to RUNTIME_PM_OPS() and use pm_ptr() to set .driver.pm. This being said, >>>> the driver won't work on a kernel with !CONFIG_PM given how you >>>> implemented probe() and remove(). >>>> >>>> The pisp-be driver suffered from the same issue and Jacopo fixed it in >>>> the last version. You can have a look at implement something similar. >>> >>> I can't right away think of any reason to not just depend on CONFIG_PM >>> and be done with it without any tricks. Do you know if there's a reason? > > We had the same discussion, and even if I would be fine depending on > CONFIG_PM, supporting !CONFIG_PM is not that much work, I kept it as > an optional dependency (it was suggested during the review as well) > >> >> Also, I don't think pisp-be is correct. It just calls >> pispbe_runtime_resume() in probe() to wake the IP up (which only enables >> pisp clock), without telling the runtime PM about it. This means the parent >> device and the suppliers may not be powered up. > > Are you referring to the code currently in the tree or to this patch ? > https://patchwork.linuxtv.org/project/linux-media/patch/20240904095836.344833-5-jacopo.mondi@ideasonboard.com/ Ah, I missed that one. I don't think it fixes the issue I mentioned. If we have PM enabled, and the parent device requires powering up for the child device (BE) to be accessible, the driver will crash when calling pispbe_hw_init(). I think you should call pm_runtime_set_active() before calling pispbe_runtime_resume(). However, you said above that "supporting !CONFIG_PM is not that much work". Maybe not. But how much work is it to get it right (for both PM and !PM), and make sure it stays right? =). Just my opinion, but if there are zero use cases for the !PM, I would just go with "depends on PM" to keep the driver simpler, less bug-prone, and easier to maintain. Tomi