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Message-ID: <d73e9504-5d4a-14cd-d834-0e21d0ca0d65@gmail.com>
Date: Tue, 30 Apr 2019 14:59:08 -0700
From: Steve Longerbeam <slongerbeam@...il.com>
To: Rui Miguel Silva <rmfrfs@...il.com>
Cc: linux-media@...r.kernel.org,
Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
"open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/8] media: staging/imx: Switch to sync registration
for IPU subdevs
Thanks Rui for catching the bisect problem, I will fix for v3.
Steve
On 4/30/19 2:56 PM, Rui Miguel Silva wrote:
> Hi Steve,
> On Sun 28 Apr 2019 at 20:09, Steve Longerbeam wrote:
>> Because the IPU sub-devices VDIC and IC are not present in the
>> device-tree, platform devices were created for them instead. This
>> allowed these sub-devices to be added to the media device's async
>> notifier and registered asynchronously along with the other
>> sub-devices that do have a device-tree presence (CSI and devices
>> external to the IPU and SoC).
>>
>> But that approach isn't really necessary. The IPU sub-devices don't
>> actually require a backing device (sd->dev is allowed to be NULL).
>> And that approach can't get around the fact that the IPU sub-devices
>> are not part of a device hierarchy, which makes it awkward to retrieve
>> the parent IPU of these devices.
>>
>> By registering them synchronously, they can be registered from the CSI
>> async bound notifier, so the init function for them can be given the CSI
>> subdev, who's dev->parent is the IPU. That is a somewhat cleaner way
>> to retrieve the parent IPU.
>>
>> So convert to synchronous registration for the VDIC and IC task
>> sub-devices, at the time a CSI sub-device is bound. There is no longer
>> a backing device for them (sd->dev is NULL), but that's ok. Also
>> set the VDIC/IC sub-device owner as the IPU, so that a reference can
>> be taken on the IPU module.
>>
>> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> I am trying to bisect when my capture starts to fail to work with
> this series, since they are so many changes and reorg that I got
> lost on some of them. But... see below.
>
>> ---
>> drivers/staging/media/imx/imx-ic-common.c | 70 ++--
>> drivers/staging/media/imx/imx-ic-prp.c | 34 +-
>> drivers/staging/media/imx/imx-ic-prpencvf.c | 70 ++--
>> drivers/staging/media/imx/imx-ic.h | 7 +-
>> drivers/staging/media/imx/imx-media-capture.c | 7 +-
>> drivers/staging/media/imx/imx-media-csi.c | 2 +-
>> drivers/staging/media/imx/imx-media-dev.c | 121 +-----
>> .../staging/media/imx/imx-media-internal-sd.c | 356 ++++++++----------
>> drivers/staging/media/imx/imx-media-of.c | 38 +-
>> drivers/staging/media/imx/imx-media-vdic.c | 85 ++---
>> drivers/staging/media/imx/imx-media.h | 67 ++--
>> drivers/staging/media/imx/imx7-media-csi.c | 3 +-
>> 12 files changed, 325 insertions(+), 535 deletions(-)
>>
>> + dev_dbg(priv->ipu_dev, "%s: link setup %s -> %s",
> <snip>
>
>> + sd->name, remote->entity->name, local->entity->name);
>>
>> mutex_lock(&priv->lock);
>>
>> @@ -864,9 +856,6 @@ static int vdic_registered(struct v4l2_subdev *sd)
>> int i, ret;
>> u32 code;
>>
>> - /* get media device */
>> - priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
>> -
>> for (i = 0; i < VDIC_NUM_PADS; i++) {
>> priv->pad[i].flags = (i == VDIC_SRC_PAD_DIRECT) ?
>> MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
>> @@ -938,77 +927,55 @@ static const struct v4l2_subdev_internal_ops vdic_internal_ops = {
>> .unregistered = vdic_unregistered,
>> };
>>
>> -static int imx_vdic_probe(struct platform_device *pdev)
>> +struct v4l2_subdev *imx_media_vdic_register(struct imx_media_dev *imxmd,
>> + struct device *ipu_dev,
>> + struct ipu_soc *ipu,
>> + u32 grp_id)
>> {
>> - struct imx_media_ipu_internal_sd_pdata *pdata;
>> + struct v4l2_device *v4l2_dev = &imxmd->v4l2_dev;
>> struct vdic_priv *priv;
>> int ret;
>>
>> - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>> + priv = devm_kzalloc(ipu_dev, sizeof(*priv), GFP_KERNEL);
>> if (!priv)
>> - return -ENOMEM;
>> + return ERR_PTR(-ENOMEM);
>>
>> - platform_set_drvdata(pdev, &priv->sd);
>> - priv->dev = &pdev->dev;
>> -
>> - pdata = priv->dev->platform_data;
>> - priv->ipu_id = pdata->ipu_id;
>> + priv->ipu_dev = ipu_dev;
>> + priv->ipu = ipu;
>> + priv->md = imxmd;
>>
>> v4l2_subdev_init(&priv->sd, &vdic_subdev_ops);
>> v4l2_set_subdevdata(&priv->sd, priv);
>> priv->sd.internal_ops = &vdic_internal_ops;
>> priv->sd.entity.ops = &vdic_entity_ops;
>> priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
>> - priv->sd.dev = &pdev->dev;
>> - priv->sd.owner = THIS_MODULE;
>> + priv->sd.owner = ipu_dev->driver->owner;
>> priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
>> - /* get our group id */
>> - priv->sd.grp_id = pdata->grp_id;
>> - strscpy(priv->sd.name, pdata->sd_name, sizeof(priv->sd.name));
>> + priv->sd.grp_id = grp_id;
>> + imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
>> + priv->sd.grp_id, ipu_get_num(ipu));
>>
>> mutex_init(&priv->lock);
>>
>> - ret = v4l2_async_register_subdev(&priv->sd);
>> + ret = v4l2_device_register_subdev(v4l2_dev, &priv->sd);
>> if (ret)
>> goto free;
>>
>> - return 0;
>> + return &priv->sd;
>> free:
>> mutex_destroy(&priv->lock);
>> - return ret;
>> + return ERR_PTR(ret);
>> }
>>
>> -static int imx_vdic_remove(struct platform_device *pdev)
>> +int imx_media_vdic_unregister(struct v4l2_subdev *sd)
>> {
>> - struct v4l2_subdev *sd = platform_get_drvdata(pdev);
>> struct vdic_priv *priv = v4l2_get_subdevdata(sd);
>>
>> v4l2_info(sd, "Removing\n");
>>
>> - v4l2_async_unregister_subdev(sd);
>> + v4l2_device_unregister_subdev(sd);
>> mutex_destroy(&priv->lock);
>> media_entity_cleanup(&sd->entity);
>>
>> return 0;
>> }
>> -
>> -static const struct platform_device_id imx_vdic_ids[] = {
>> - { .name = "imx-ipuv3-vdic" },
>> - { },
>> -};
>> -MODULE_DEVICE_TABLE(platform, imx_vdic_ids);
>> -
>> -static struct platform_driver imx_vdic_driver = {
>> - .probe = imx_vdic_probe,
>> - .remove = imx_vdic_remove,
>> - .id_table = imx_vdic_ids,
>> - .driver = {
>> - .name = "imx-ipuv3-vdic",
>> - },
>> -};
>> -module_platform_driver(imx_vdic_driver);
>> -
>> -MODULE_DESCRIPTION("i.MX VDIC subdev driver");
>> -MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@...tor.com>");
>> -MODULE_LICENSE("GPL");
>> -MODULE_ALIAS("platform:imx-ipuv3-vdic");
> This breaks compilation until patch 6/8. I think you need to make
> some makefile changes also in this patch.
>
> WARNING: modpost: missing MODULE_LICENSE() in drivers/staging/media/imx/imx-media-ic.o
> see include/linux/module.h for more information
> WARNING: modpost: missing MODULE_LICENSE() in drivers/staging/media/imx/imx-media-vdic.o
> see include/linux/module.h for more information
> ERROR: "imx_media_ic_register" [drivers/staging/media/imx/imx-media.ko] undefined!
> ERROR: "imx_media_vdic_register" [drivers/staging/media/imx/imx-media.ko] undefined!
> ERROR: "imx_media_vdic_unregister" [drivers/staging/media/imx/imx-media.ko] undefined!
> ERROR: "imx_media_ic_unregister" [drivers/staging/media/imx/imx-media.ko] undefined!
> make[2]: *** [scripts/Makefile.modpost:91: __modpost] Error 1
> make[1]: *** [/dev/shm/linux-git/Makefile:1263: modules] Error 2
> make: *** [Makefile:170: sub-make] Error 2
>
> ---
> Cheers,
> Rui
>
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