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+renesas@xxxxxxxxxxxx>
---
drivers/media/platform/rcar-vin/rcar-core.c | 179 +++++++++++++++++++++++++++-
drivers/media/platform/rcar-vin/rcar-vin.h | 38 ++++++
2 files changed, 216 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index dd0525f2ba336bc2..4218a73eb6885486 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -20,11 +20,170 @@
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/slab.h>
#include <media/v4l2-fwnode.h>
#include "rcar-vin.h"
+/* -----------------------------------------------------------------------------
+ * Gen3 CSI2 Group Allocator
+ */
+
+static int rvin_group_read_id(struct rvin_dev *vin, struct device_node *np)
+{
+ u32 val;
+ int ret;
+
+ ret = of_property_read_u32(np, "renesas,id", &val);
+ if (ret) {
+ vin_err(vin, "%s: No renesas,id property found\n",
+ of_node_full_name(np));
+ return -EINVAL;
+ }
+
+ if (val >= RCAR_VIN_NUM) {
+ vin_err(vin, "%s: Invalid renesas,id '%u'\n",
+ of_node_full_name(np), val);
+ return -EINVAL;
+ }
+
+ return val;
+}
+
+static DEFINE_MUTEX(rvin_group_lock);
+static struct rvin_group *rvin_group_data;
+
+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 int rvin_group_add_vin(struct rvin_dev *vin)
+{
+ int ret;
+
+ ret = rvin_group_read_id(vin, vin->dev->of_node);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&vin->group->lock);
+
+ if (vin->group->vin[ret]) {
+ mutex_unlock(&vin->group->lock);
+ vin_err(vin, "VIN number %d already occupied\n", ret);
+ return -EINVAL;
+ }
+
+ vin->group->vin[ret] = vin;
+
+ mutex_unlock(&vin->group->lock);
+
+ vin_dbg(vin, "I'm VIN number %d", ret);
+
+ return 0;
+}
+
+static int 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 -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));
+ 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 ret;
+ }
+ }
+
+ vin->group = group;
+ vin->v4l2_dev.mdev = mdev;
+
+ ret = rvin_group_add_vin(vin);
+ if (ret) {
+ kref_put(&group->refcount, rvin_group_release);
+ mutex_unlock(&rvin_group_lock);
+ return ret;
+ }
+
+ mutex_unlock(&rvin_group_lock);
+
+ return 0;
+}
+
+static void rvin_group_delete(struct rvin_dev *vin)
+{
+ unsigned int i;
+
+ mutex_lock(&vin->group->lock);
+ for (i = 0; i < RCAR_VIN_NUM; i++)
+ if (vin->group->vin[i] == vin)
+ vin->group->vin[i] = NULL;
+ mutex_unlock(&vin->group->lock);
+
+ vin_dbg(vin, "%s: group=%p\n", __func__, &vin->group);
+ kref_put(&vin->group->refcount, rvin_group_release);
+}
+
/* -----------------------------------------------------------------------------
* Async notifier
*/
@@ -283,12 +442,27 @@ static int rvin_digital_graph_init(struct rvin_dev *vin)
static int rvin_group_init(struct rvin_dev *vin)
{
+ int ret;
+
+ ret = rvin_group_allocate(vin);
+ if (ret)
+ return ret;
+
/* All our sources are CSI-2 */
vin->mbus_cfg.type = V4L2_MBUS_CSI2;
vin->mbus_cfg.flags = 0;
vin->pad.flags = MEDIA_PAD_FL_SINK;
- return media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
+ ret = media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
+ if (ret)
+ goto error_group;
+
+ return 0;
+
+error_group:
+ rvin_group_delete(vin);
+
+ return ret;
}
/* -----------------------------------------------------------------------------
@@ -416,6 +590,9 @@ static int rcar_vin_remove(struct platform_device *pdev)
rvin_v4l2_remove(vin);
+ if (vin->info->use_mc)
+ rvin_group_delete(vin);
+
rvin_dma_remove(vin);
return 0;
diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 9c47669669c0469c..88683aaee3b6acd5 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);
--
2.14.0
