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[209.132.180.67]) by mx.google.com with ESMTP id b16si13608636pfd.126.2019.06.20.05.03.49; Thu, 20 Jun 2019 05:04:09 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731738AbfFTMBy (ORCPT + 99 others); Thu, 20 Jun 2019 08:01:54 -0400 Received: from lb3-smtp-cloud9.xs4all.net ([194.109.24.30]:40241 "EHLO lb3-smtp-cloud9.xs4all.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726391AbfFTMBx (ORCPT ); Thu, 20 Jun 2019 08:01:53 -0400 Received: from [IPv6:2001:983:e9a7:1:4588:eede:a2a7:f8e] ([IPv6:2001:983:e9a7:1:4588:eede:a2a7:f8e]) by smtp-cloud9.xs4all.net with ESMTPA id dvlAhagzHSfvXdvlDhuoEV; Thu, 20 Jun 2019 14:01:51 +0200 Subject: Re: [PATCH v2 2/3] media: stm32-dcmi: add media controller support To: Hugues Fruchet , Alexandre Torgue , Mauro Carvalho Chehab , Sakari Ailus Cc: linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, Benjamin Gaignard , Yannick Fertre , Philippe CORNU , Mickael GUENE References: <1560242912-17138-1-git-send-email-hugues.fruchet@st.com> <1560242912-17138-3-git-send-email-hugues.fruchet@st.com> From: Hans Verkuil Message-ID: <0ad39c36-5636-b2a6-8098-a1b38e7f907d@xs4all.nl> Date: Thu, 20 Jun 2019 14:01:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1560242912-17138-3-git-send-email-hugues.fruchet@st.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4wfMuT9MZWw84m+HPjf2ZLoTRPZNu9nSJQqRP6UsbmQN1wtPOfW18byDclmW0QkYHEHCjF2jzyDX4GaELr2qSrZrOPBfViS9Ku8P/kF8nTI19cec2L63UG 8AFN6Pm9VncG6Gv52lcLG5fcYUgwbpX6cBmwZKCpOY/rkbOVL0uBm+AZu/5orWCk/hoPBBq1rAHciNoQSOuHT1yANhm1CzN+lLiaKXQ/b8ryZsHpZaONz2Fm 6GUN5ImcoEm0PVl3RT6xA6uU4k7/Jp/xb1SMUe4tcHTDR082Df1R11Lwld2Uw5AweNX6+TI5ODrFI9kscmG8VCwmc7g+a7DhLWgWX+EuR6Q5L7jcFZd4Gbf2 3cJuEqoHXq1g93hDrRuTZCk/oa5VTtZzqRt/i/srUKGjEnoPiAcSGArj9KT6RAvH3XxAbqIK/2FOeadu9LmgZ4RTCKEK020RqEkY3xYTyIahk6t0ac3xwlBm 1H4wqYmNTrG4sqN6GcLGMNEELHLWWXrtWJXuGzpQz3F2y4Nra4AOeKlE2F6D7ztmiBaordsvC7dRPms6F5BEGD6HAfgYUIiVHSAJ4DYxry0h5sP6o1AzFAh3 nGxattgWPtyb57pT2tR4W46UTOhHLpcFz66c8DN77iu1vgzRcuzJJXUfsuRwHc334NI6O2GsFdY2PqhZRPRumqobYpVEsFRZMWVQvdIMlRJVuRvw1wdNZpaf PoD5pEAFlW0= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/11/19 10:48 AM, Hugues Fruchet wrote: > Add media controller support to dcmi. > > Signed-off-by: Hugues Fruchet > --- > drivers/media/platform/Kconfig | 2 +- > drivers/media/platform/stm32/stm32-dcmi.c | 83 +++++++++++++++++++++++-------- > 2 files changed, 63 insertions(+), 22 deletions(-) > > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig > index 8a19654..de7e21f 100644 > --- a/drivers/media/platform/Kconfig > +++ b/drivers/media/platform/Kconfig > @@ -121,7 +121,7 @@ config VIDEO_S3C_CAMIF > > config VIDEO_STM32_DCMI > tristate "STM32 Digital Camera Memory Interface (DCMI) support" > - depends on VIDEO_V4L2 && OF > + depends on VIDEO_V4L2 && OF && MEDIA_CONTROLLER > depends on ARCH_STM32 || COMPILE_TEST > select VIDEOBUF2_DMA_CONTIG > select V4L2_FWNODE > diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c > index 7a4d559..3a69783 100644 > --- a/drivers/media/platform/stm32/stm32-dcmi.c > +++ b/drivers/media/platform/stm32/stm32-dcmi.c > @@ -170,6 +170,9 @@ struct stm32_dcmi { > > /* Ensure DMA operations atomicity */ > struct mutex dma_lock; > + > + struct media_device mdev; > + struct media_pad vid_cap_pad; > }; > > static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n) > @@ -1545,21 +1548,12 @@ static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier) > dev_err(dcmi->dev, "Could not get sensor bounds\n"); > return ret; > } > - > ret = dcmi_set_default_fmt(dcmi); > if (ret) { > dev_err(dcmi->dev, "Could not set default format\n"); > return ret; > } > > - ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1); > - if (ret) { > - dev_err(dcmi->dev, "Failed to register video device\n"); > - return ret; > - } Why was this moved to probe()? Off-hand I see no reason for that. Regards, Hans > - > - dev_dbg(dcmi->dev, "Device registered as %s\n", > - video_device_node_name(dcmi->vdev)); > return 0; > } > > @@ -1648,6 +1642,12 @@ static int dcmi_graph_init(struct stm32_dcmi *dcmi) > return 0; > } > > +static void dcmi_graph_deinit(struct stm32_dcmi *dcmi) > +{ > + v4l2_async_notifier_unregister(&dcmi->notifier); > + v4l2_async_notifier_cleanup(&dcmi->notifier); > +} > + > static int dcmi_probe(struct platform_device *pdev) > { > struct device_node *np = pdev->dev.of_node; > @@ -1752,10 +1752,27 @@ static int dcmi_probe(struct platform_device *pdev) > > q = &dcmi->queue; > > + dcmi->v4l2_dev.mdev = &dcmi->mdev; > + > + /* Initialize media device */ > + strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model)); > + snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info), > + "platform:%s", DRV_NAME); > + dcmi->mdev.dev = &pdev->dev; > + media_device_init(&dcmi->mdev); > + > + /* Register the media device */ > + ret = media_device_register(&dcmi->mdev); > + if (ret) { > + dev_err(dcmi->dev, "Failed to register media device (%d)\n", > + ret); > + goto err_media_device_cleanup; > + } > + > /* Initialize the top-level structure */ > ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev); > if (ret) > - goto err_dma_release; > + goto err_media_device_unregister; > > dcmi->vdev = video_device_alloc(); > if (!dcmi->vdev) { > @@ -1775,6 +1792,25 @@ static int dcmi_probe(struct platform_device *pdev) > V4L2_CAP_READWRITE; > video_set_drvdata(dcmi->vdev, dcmi); > > + /* Media entity pads */ > + dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK; > + ret = media_entity_pads_init(&dcmi->vdev->entity, > + 1, &dcmi->vid_cap_pad); > + if (ret) { > + dev_err(dcmi->dev, "Failed to init media entity pad\n"); > + goto err_device_unregister; > + } > + dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT; > + > + ret = video_register_device(dcmi->vdev, VFL_TYPE_GRABBER, -1); > + if (ret) { > + dev_err(dcmi->dev, "Failed to register video device\n"); > + goto err_media_entity_cleanup; > + } > + > + dev_dbg(dcmi->dev, "Device registered as %s\n", > + video_device_node_name(dcmi->vdev)); > + > /* Buffer queue */ > q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; > q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF; > @@ -1790,18 +1826,18 @@ static int dcmi_probe(struct platform_device *pdev) > ret = vb2_queue_init(q); > if (ret < 0) { > dev_err(&pdev->dev, "Failed to initialize vb2 queue\n"); > - goto err_device_release; > + goto err_media_entity_cleanup; > } > > ret = dcmi_graph_init(dcmi); > if (ret < 0) > - goto err_device_release; > + goto err_media_entity_cleanup; > > /* Reset device */ > ret = reset_control_assert(dcmi->rstc); > if (ret) { > dev_err(&pdev->dev, "Failed to assert the reset line\n"); > - goto err_cleanup; > + goto err_graph_deinit; > } > > usleep_range(3000, 5000); > @@ -1809,7 +1845,7 @@ static int dcmi_probe(struct platform_device *pdev) > ret = reset_control_deassert(dcmi->rstc); > if (ret) { > dev_err(&pdev->dev, "Failed to deassert the reset line\n"); > - goto err_cleanup; > + goto err_graph_deinit; > } > > dev_info(&pdev->dev, "Probe done\n"); > @@ -1820,13 +1856,16 @@ static int dcmi_probe(struct platform_device *pdev) > > return 0; > > -err_cleanup: > - v4l2_async_notifier_cleanup(&dcmi->notifier); > -err_device_release: > - video_device_release(dcmi->vdev); > +err_graph_deinit: > + dcmi_graph_deinit(dcmi); > +err_media_entity_cleanup: > + media_entity_cleanup(&dcmi->vdev->entity); > err_device_unregister: > v4l2_device_unregister(&dcmi->v4l2_dev); > -err_dma_release: > +err_media_device_unregister: > + media_device_unregister(&dcmi->mdev); > +err_media_device_cleanup: > + media_device_cleanup(&dcmi->mdev); > dma_release_channel(dcmi->dma_chan); > > return ret; > @@ -1838,9 +1877,11 @@ static int dcmi_remove(struct platform_device *pdev) > > pm_runtime_disable(&pdev->dev); > > - v4l2_async_notifier_unregister(&dcmi->notifier); > - v4l2_async_notifier_cleanup(&dcmi->notifier); > + dcmi_graph_deinit(dcmi); > + media_entity_cleanup(&dcmi->vdev->entity); > v4l2_device_unregister(&dcmi->v4l2_dev); > + media_device_unregister(&dcmi->mdev); > + media_device_cleanup(&dcmi->mdev); > > dma_release_channel(dcmi->dma_chan); > >