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media: rcar-vin: move subdevice handling to async callbacks 

In preparation for Gen3 support move the subdevice initialization and
clean up from rvin_v4l2_{register,unregister}() directly to the async
callbacks. This simplifies the addition of Gen3 support as the
rvin_v4l2_register() can be shared for both Gen2 and Gen3 while direct
subdevice control are only used on Gen2.

While moving this code drop a large comment which is copied from the
framework documentation and fold rvin_mbus_supported() into its only
caller. Also move the initialization and cleanup code to separate
functions to increase readability.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Niklas Söderlund 2018-04-14 07:56:59 -04:00 committed by Mauro Carvalho Chehab
parent a31ffe939f
commit 23525ef9f8
2 changed files with 71 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
drivers/media/platform/rcar-vin/rcar-core.c
View File

@ -46,30 +46,82 @@ static int rvin_find_pad(struct v4l2_subdev *sd, int direction)
return -EINVAL;
}
static bool rvin_mbus_supported(struct rvin_graph_entity *entity)
/* The vin lock should be held when calling the subdevice attach and detach */
static int rvin_digital_subdevice_attach(struct rvin_dev *vin,
struct v4l2_subdev *subdev)
{
struct v4l2_subdev *sd = entity->subdev;
struct v4l2_subdev_mbus_code_enum code = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
int ret;
/* Find source and sink pad of remote subdevice */
ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SOURCE);
if (ret < 0)
return ret;
vin->digital->source_pad = ret;
ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SINK);
vin->digital->sink_pad = ret < 0 ? 0 : ret;
/* Find compatible subdevices mbus format */
vin->digital->code = 0;
code.index = 0;
code.pad = entity->source_pad;
while (!v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code)) {
code.pad = vin->digital->source_pad;
while (!vin->digital->code &&
!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL, &code)) {
code.index++;
switch (code.code) {
case MEDIA_BUS_FMT_YUYV8_1X16:
case MEDIA_BUS_FMT_UYVY8_2X8:
case MEDIA_BUS_FMT_UYVY10_2X10:
case MEDIA_BUS_FMT_RGB888_1X24:
entity->code = code.code;
return true;
vin->digital->code = code.code;
vin_dbg(vin, "Found media bus format for %s: %d\n",
subdev->name, vin->digital->code);
break;
default:
break;
}
}
return false;
if (!vin->digital->code) {
vin_err(vin, "Unsupported media bus format for %s\n",
subdev->name);
return -EINVAL;
}
/* Read tvnorms */
ret = v4l2_subdev_call(subdev, video, g_tvnorms, &vin->vdev.tvnorms);
if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
return ret;
/* Add the controls */
ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 16);
if (ret < 0)
return ret;
ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, subdev->ctrl_handler,
NULL);
if (ret < 0) {
v4l2_ctrl_handler_free(&vin->ctrl_handler);
return ret;
}
vin->vdev.ctrl_handler = &vin->ctrl_handler;
vin->digital->subdev = subdev;
return 0;
}
static void rvin_digital_subdevice_detach(struct rvin_dev *vin)
{
rvin_v4l2_unregister(vin);
v4l2_ctrl_handler_free(&vin->ctrl_handler);
vin->vdev.ctrl_handler = NULL;
vin->digital->subdev = NULL;
}
static int rvin_digital_notify_complete(struct v4l2_async_notifier *notifier)
@ -77,16 +129,6 @@ static int rvin_digital_notify_complete(struct v4l2_async_notifier *notifier)
struct rvin_dev *vin = notifier_to_vin(notifier);
int ret;
/* Verify subdevices mbus format */
if (!rvin_mbus_supported(vin->digital)) {
vin_err(vin, "Unsupported media bus format for %s\n",
vin->digital->subdev->name);
return -EINVAL;
}
vin_dbg(vin, "Found media bus format for %s: %d\n",
vin->digital->subdev->name, vin->digital->code);
ret = v4l2_device_register_subdev_nodes(&vin->v4l2_dev);
if (ret < 0) {
vin_err(vin, "Failed to register subdev nodes\n");
@ -103,8 +145,10 @@ static void rvin_digital_notify_unbind(struct v4l2_async_notifier *notifier,
struct rvin_dev *vin = notifier_to_vin(notifier);
vin_dbg(vin, "unbind digital subdev %s\n", subdev->name);
rvin_v4l2_unregister(vin);
vin->digital->subdev = NULL;
mutex_lock(&vin->lock);
rvin_digital_subdevice_detach(vin);
mutex_unlock(&vin->lock);
}
static int rvin_digital_notify_bound(struct v4l2_async_notifier *notifier,
@ -114,19 +158,13 @@ static int rvin_digital_notify_bound(struct v4l2_async_notifier *notifier,
struct rvin_dev *vin = notifier_to_vin(notifier);
int ret;
v4l2_set_subdev_hostdata(subdev, vin);
/* Find source and sink pad of remote subdevice */
ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SOURCE);
if (ret < 0)
mutex_lock(&vin->lock);
ret = rvin_digital_subdevice_attach(vin, subdev);
mutex_unlock(&vin->lock);
if (ret)
return ret;
vin->digital->source_pad = ret;
ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SINK);
vin->digital->sink_pad = ret < 0 ? 0 : ret;
vin->digital->subdev = subdev;
v4l2_set_subdev_hostdata(subdev, vin);
vin_dbg(vin, "bound subdev %s source pad: %u sink pad: %u\n",
subdev->name, vin->digital->source_pad,
@ -134,13 +172,13 @@ static int rvin_digital_notify_bound(struct v4l2_async_notifier *notifier,
return 0;
}
static const struct v4l2_async_notifier_operations rvin_digital_notify_ops = {
.bound = rvin_digital_notify_bound,
.unbind = rvin_digital_notify_unbind,
.complete = rvin_digital_notify_complete,
};
static int rvin_digital_parse_v4l2(struct device *dev,
struct v4l2_fwnode_endpoint *vep,
struct v4l2_async_subdev *asd)
@ -277,6 +315,8 @@ static int rcar_vin_remove(struct platform_device *pdev)
v4l2_async_notifier_unregister(&vin->notifier);
v4l2_async_notifier_cleanup(&vin->notifier);
v4l2_ctrl_handler_free(&vin->ctrl_handler);
rvin_dma_unregister(vin);
return 0;

35
drivers/media/platform/rcar-vin/rcar-v4l2.c
View File

@ -847,9 +847,6 @@ void rvin_v4l2_unregister(struct rvin_dev *vin)
v4l2_info(&vin->v4l2_dev, "Removing %s\n",
video_device_node_name(&vin->vdev));
/* Checks internaly if handlers have been init or not */
v4l2_ctrl_handler_free(&vin->ctrl_handler);
/* Checks internaly if vdev have been init or not */
video_unregister_device(&vin->vdev);
}
@ -872,41 +869,10 @@ static void rvin_notify(struct v4l2_subdev *sd,
int rvin_v4l2_register(struct rvin_dev *vin)
{
struct video_device *vdev = &vin->vdev;
struct v4l2_subdev *sd = vin_to_source(vin);
int ret;
v4l2_set_subdev_hostdata(sd, vin);
vin->v4l2_dev.notify = rvin_notify;
ret = v4l2_subdev_call(sd, video, g_tvnorms, &vin->vdev.tvnorms);
if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
return ret;
if (vin->vdev.tvnorms == 0) {
/* Disable the STD API if there are no tvnorms defined */
v4l2_disable_ioctl(&vin->vdev, VIDIOC_G_STD);
v4l2_disable_ioctl(&vin->vdev, VIDIOC_S_STD);
v4l2_disable_ioctl(&vin->vdev, VIDIOC_QUERYSTD);
v4l2_disable_ioctl(&vin->vdev, VIDIOC_ENUMSTD);
}
/* Add the controls */
/*
* Currently the subdev with the largest number of controls (13) is
* ov6550. So let's pick 16 as a hint for the control handler. Note
* that this is a hint only: too large and you waste some memory, too
* small and there is a (very) small performance hit when looking up
* controls in the internal hash.
*/
ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 16);
if (ret < 0)
return ret;
ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, sd->ctrl_handler, NULL);
if (ret < 0)
return ret;
/* video node */
vdev->fops = &rvin_fops;
vdev->v4l2_dev = &vin->v4l2_dev;
@ -915,7 +881,6 @@ int rvin_v4l2_register(struct rvin_dev *vin)
vdev->release = video_device_release_empty;
vdev->ioctl_ops = &rvin_ioctl_ops;
vdev->lock = &vin->lock;
vdev->ctrl_handler = &vin->ctrl_handler;
vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;