Hi Niklas,
On Fri, Apr 28, 2017 at 12:41:57AM +0200, Niklas Söderlund wrote:
> In media controller mode all VIN instances needs to be part of the same
> media graph. There is also a need to each VIN instance to know and in
> some cases be able to communicate with other VIN instances.
>
> Add a allocator framework where the first VIN instance to be probed
> creates a shared data structure and creates a media device.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
> ---
> drivers/media/platform/rcar-vin/rcar-core.c | 112
> +++++++++++++++++++++++++++-
> drivers/media/platform/rcar-vin/rcar-vin.h | 38 ++++++++++
> 2 files changed, 147 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c
> b/drivers/media/platform/rcar-vin/rcar-core.c
> index f560d27449b84882..c10770d5ec37816c 100644
> --- a/drivers/media/platform/rcar-vin/rcar-core.c
> +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> @@ -20,12 +20,110 @@
> #include <linux/of_graph.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> +#include <linux/slab.h>
>
> #include <media/v4l2-of.h>
>
> #include "rcar-vin.h"
>
> /*
> -----------------------------------------------------------------------------
> + * Gen3 CSI2 Group Allocator
> + */
> +
> +static DEFINE_MUTEX(rvin_group_lock);
> +static struct rvin_group *rvin_group_data;
Uh-oh.
It'd be nice to find a way for managing the group of devices without a
global list for the group.
Do all the callers operating on a group have some kind of identifying
information, e.g. OF node or struct device? Could it be used to obtain the
group?
I'm not sure if this would be a real problem though as long as you have only
a single group in a system.
> +
> +static void rvin_group_release(struct kref *kref)
> +{
> + struct rvin_group *group =
> + container_of(kref, struct rvin_group, refcount);
> +
> + mutex_lock(&rvin_group_lock);
> +
> + media_device_unregister(&group->mdev);
> + media_device_cleanup(&group->mdev);
> +
> + rvin_group_data = NULL;
> +
> + mutex_unlock(&rvin_group_lock);
> +
> + kfree(group);
> +}
> +
> +static struct rvin_group *__rvin_group_allocate(struct rvin_dev *vin)
> +{
> + struct rvin_group *group;
> +
> + if (rvin_group_data) {
> + group = rvin_group_data;
> + kref_get(&group->refcount);
> + vin_dbg(vin, "%s: get group=%p\n", __func__, group);
> + return group;
> + }
> +
> + group = kzalloc(sizeof(*group), GFP_KERNEL);
> + if (!group)
> + return NULL;
> +
> + kref_init(&group->refcount);
> + rvin_group_data = group;
> +
> + vin_dbg(vin, "%s: alloc group=%p\n", __func__, group);
> + return group;
> +}
> +
> +static struct rvin_group *rvin_group_allocate(struct rvin_dev *vin)
> +{
> + struct rvin_group *group;
> + struct media_device *mdev;
> + int ret;
> +
> + mutex_lock(&rvin_group_lock);
> +
> + group = __rvin_group_allocate(vin);
> + if (!group) {
> + mutex_unlock(&rvin_group_lock);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + /* Init group data if its not already initialized */
> + mdev = &group->mdev;
> + if (!mdev->dev) {
> + mutex_init(&group->lock);
> + mdev->dev = vin->dev;
> +
> + strlcpy(mdev->driver_name, "Renesas VIN",
> + sizeof(mdev->driver_name));
> + strlcpy(mdev->model, vin->dev->of_node->name,
> + sizeof(mdev->model));
> + strlcpy(mdev->bus_info, of_node_full_name(vin->dev->of_node),
> + sizeof(mdev->bus_info));
> + mdev->driver_version = LINUX_VERSION_CODE;
> + media_device_init(mdev);
> +
> + ret = media_device_register(mdev);
> + if (ret) {
> + vin_err(vin, "Failed to register media device\n");
> + kref_put(&group->refcount, rvin_group_release);
> + mutex_unlock(&rvin_group_lock);
> + return ERR_PTR(ret);
> + }
> + }
> +
> + vin->v4l2_dev.mdev = mdev;
> +
> + mutex_unlock(&rvin_group_lock);
> +
> + return group;
> +}
> +
> +static void rvin_group_delete(struct rvin_dev *vin)
> +{
> + vin_dbg(vin, "%s: group=%p\n", __func__, &vin->group);
> + kref_put(&vin->group->refcount, rvin_group_release);
> +}
> +
> +/*
> -----------------------------------------------------------------------------
> * Async notifier
> */
>
> @@ -263,9 +361,13 @@ static int rvin_group_init(struct rvin_dev *vin)
> {
> int ret;
>
> + vin->group = rvin_group_allocate(vin);
> + if (IS_ERR(vin->group))
> + return PTR_ERR(vin->group);
> +
> ret = rvin_v4l2_mc_probe(vin);
> if (ret)
> - return ret;
> + goto error_group;
>
> vin->pad.flags = MEDIA_PAD_FL_SINK;
> ret = media_entity_pads_init(&vin->vdev->entity, 1, &vin->pad);
> @@ -275,6 +377,8 @@ static int rvin_group_init(struct rvin_dev *vin)
> return 0;
> error_v4l2:
> rvin_v4l2_mc_remove(vin);
> +error_group:
> + rvin_group_delete(vin);
>
> return ret;
> }
> @@ -398,10 +502,12 @@ static int rcar_vin_remove(struct platform_device *pdev)
>
> v4l2_async_notifier_unregister(&vin->notifier);
>
> - if (vin->info->use_mc)
> + if (vin->info->use_mc) {
> rvin_v4l2_mc_remove(vin);
> - else
> + rvin_group_delete(vin);
> + } else {
> rvin_v4l2_remove(vin);
> + }
>
> rvin_dma_remove(vin);
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h
> b/drivers/media/platform/rcar-vin/rcar-vin.h
> index 06934313950253f4..21b6c9292686e41a 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -17,6 +17,8 @@
> #ifndef __RCAR_VIN__
> #define __RCAR_VIN__
>
> +#include <linux/kref.h>
> +
> #include <media/v4l2-async.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-dev.h>
> @@ -30,6 +32,9 @@
> /* Address alignment mask for HW buffers */
> #define HW_BUFFER_MASK 0x7f
>
> +/* Max number on VIN instances that can be in a system */
> +#define RCAR_VIN_NUM 8
> +
> enum chip_id {
> RCAR_H1,
> RCAR_M1,
> @@ -37,6 +42,15 @@ enum chip_id {
> RCAR_GEN3,
> };
>
> +enum rvin_csi_id {
> + RVIN_CSI20,
> + RVIN_CSI21,
> + RVIN_CSI40,
> + RVIN_CSI41,
> + RVIN_CSI_MAX,
> + RVIN_NC, /* Not Connected */
> +};
> +
> /**
> * STOPPED - No operation in progress
> * RUNNING - Operation in progress have buffers
> @@ -75,6 +89,8 @@ struct rvin_graph_entity {
> unsigned int sink_pad;
> };
>
> +struct rvin_group;
> +
> /**
> * struct rvin_info- Information about the particular VIN implementation
> * @chip: type of VIN chip
> @@ -103,6 +119,7 @@ struct rvin_info {
> * @notifier: V4L2 asynchronous subdevs notifier
> * @digital: entity in the DT for local digital subdevice
> *
> + * @group: Gen3 CSI group
> * @pad: pad for media controller
> *
> * @lock: protects @queue
> @@ -134,6 +151,7 @@ struct rvin_dev {
> struct v4l2_async_notifier notifier;
> struct rvin_graph_entity digital;
>
> + struct rvin_group *group;
> struct media_pad pad;
>
> struct mutex lock;
> @@ -162,6 +180,26 @@ struct rvin_dev {
> #define vin_warn(d, fmt, arg...) dev_warn(d->dev, fmt, ##arg)
> #define vin_err(d, fmt, arg...) dev_err(d->dev, fmt, ##arg)
>
> +/**
> + * struct rvin_group - VIN CSI2 group information
> + * @refcount: number of VIN instances using the group
> + *
> + * @mdev: media device which represents the group
> + *
> + * @lock: protects the vin and csi members
> + * @vin: VIN instances which are part of the group
> + * @csi: CSI-2 entities that are part of the group
> + */
> +struct rvin_group {
> + struct kref refcount;
> +
> + struct media_device mdev;
> +
> + struct mutex lock;
> + struct rvin_dev *vin[RCAR_VIN_NUM];
> + struct rvin_graph_entity csi[RVIN_CSI_MAX];
> +};
> +
> int rvin_dma_probe(struct rvin_dev *vin, int irq);
> void rvin_dma_remove(struct rvin_dev *vin);
>
--
Regards,
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
