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Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=driverdev-devel-bounces@linuxdriverproject.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 7027F8759C; Tue, 28 Jul 2020 10:37:09 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tzAQ8HKrhis0; Tue, 28 Jul 2020 10:37:08 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by whitealder.osuosl.org (Postfix) with ESMTP id 6E0598706B; Tue, 28 Jul 2020 10:37:08 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by ash.osuosl.org (Postfix) with ESMTP id 4C27F1BF396 for ; Tue, 28 Jul 2020 10:37:07 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 454788823B for ; Tue, 28 Jul 2020 10:37:07 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cwtMl8ztKC+H for ; Tue, 28 Jul 2020 10:37:06 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from comms.puri.sm (comms.puri.sm [159.203.221.185]) by hemlock.osuosl.org (Postfix) with ESMTPS id 731098817D for ; Tue, 28 Jul 2020 10:37:06 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id C27C3E01B1; Tue, 28 Jul 2020 03:37:05 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id biIKMNImzc_b; Tue, 28 Jul 2020 03:37:04 -0700 (PDT) Subject: Re: nxp imx8m CSI drivers From: Martin Kepplinger To: slongerbeam@gmail.com, p.zabel@pengutronix.de, "mchehab@kernel.org" , Pavel Machek References: Autocrypt: addr=martin.kepplinger@puri.sm; keydata= 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Pengutronix Kernel Team , Shawn Guo , "linux-arm-kernel@lists.infradead.org" , "linux-media@vger.kernel.org" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" On 09.07.20 11:32, Martin Kepplinger wrote: > hi linux-media people, > > TL-DR: when exactly is "sd->entity.function == MEDIA_ENT_F_VID_MUX"? > > > I try to use the camera on our librem5-devkit (imx8mq): I try to use > only mainline drivers except for "mxc-mipi-csi2_yav" taken from > linux-imx (which we can prepare to submit if a PoC works. This is the > tree I'm experimenting with: > > https://source.puri.sm/martin.kepplinger/linux-next/-/commits/5.8-rc4/librem5___csi > > * "imx7-media-csi" / imx-media-capture / imx-media-utils currently in > staging (that should work according to NXP) > * ov5640 mainline driver > * mxc-mipi-csi2_yav from NXP tree (linux-imx) with > v4l2_subdev_video_ops' mipi_csis_g_parm and mipi_csis_s_parm callbacks > removed (due to missing API in mainline) > > the drivers probe and run but the following fails when trying to use the > camera (gstreamer): > > in imx-media-utils' imx_media_pipeline_set_stream() the call to > v4l2_subdev_call(sd, video, s_stream, 1) returns with 32 (broken pipe) > and thus the application that tries to use the camera too. > > One problem is definitely the trees' last commit (that I did as a > workaround) in this tree that makes the drivers probe but only by > ignoring this probably needed check: > > imx7-media-csi's imx7_csi_notify_bound() callback implementation gets > called during startup. But if (WARN_ON(sd->entity.function != > MEDIA_ENT_F_VID_MUX)) is true so this is the wrong type of subdev (?). > > I just want to put this out there and check if the general approach is > valid at all and if there's anything that comes to your mind. > > thanks a lot, > martin > (added Pavel Machek) still I'm only on the librem5 Devkit: the situation regarding a tree that should use the imx7-media-csi csi_bridge driver hasn't changed, see above for the details. The tree I tried now is this one: https://source.puri.sm/martin.kepplinger/linux-next/-/commits/5.8-rc7/librem5___csi_ml1 A tree that includes NXP's csi_bridge and mipi-csi drivers (and camera driver) on the other hand works, and I have one based on v5.8-rcX too: https://source.puri.sm/martin.kepplinger/linux-next/-/commits/5.8-rc7/librem5___csi_nxp Since I want to look into a different camera driver, I might use that nxp-drivers tree to work on that, but our goal is obviously to use what is already in staging and should work (the csi bridge driver at least). In case you know more about the v4l2 details that don't match over there, please have a look. thanks a lot in advance, martin _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel