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[media] staging: v4l: omap4iss: Use V4L2 graph PM operations

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Power on devices represented by entities in the graph through the pipeline
state using V4L2 graph PM operations instead of what was in the omap3isp
driver.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Sakari Ailus 2016-02-21 13:25:11 -03:00 committed by Mauro Carvalho Chehab
parent 506a47eb4c
commit a288b78b83
4 changed files with 7 additions and 226 deletions
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211
drivers/staging/media/omap4iss/iss.c
View File

@ -362,215 +362,6 @@ static irqreturn_t iss_isr(int irq, void *_iss)
return IRQ_HANDLED;
}
/* -----------------------------------------------------------------------------
* Pipeline power management
*
* Entities must be powered up when part of a pipeline that contains at least
* one open video device node.
*
* To achieve this use the entity use_count field to track the number of users.
* For entities corresponding to video device nodes the use_count field stores
* the users count of the node. For entities corresponding to subdevs the
* use_count field stores the total number of users of all video device nodes
* in the pipeline.
*
* The omap4iss_pipeline_pm_use() function must be called in the open() and
* close() handlers of video device nodes. It increments or decrements the use
* count of all subdev entities in the pipeline.
*
* To react to link management on powered pipelines, the link setup notification
* callback updates the use count of all entities in the source and sink sides
* of the link.
*/
/*
* iss_pipeline_pm_use_count - Count the number of users of a pipeline
* @entity: The entity
*
* Return the total number of users of all video device nodes in the pipeline.
*/
static int iss_pipeline_pm_use_count(struct media_entity *entity,
struct media_entity_graph *graph)
{
int use = 0;
media_entity_graph_walk_start(graph, entity);
while ((entity = media_entity_graph_walk_next(graph))) {
if (is_media_entity_v4l2_io(entity))
use += entity->use_count;
}
return use;
}
/*
* iss_pipeline_pm_power_one - Apply power change to an entity
* @entity: The entity
* @change: Use count change
*
* Change the entity use count by @change. If the entity is a subdev update its
* power state by calling the core::s_power operation when the use count goes
* from 0 to != 0 or from != 0 to 0.
*
* Return 0 on success or a negative error code on failure.
*/
static int iss_pipeline_pm_power_one(struct media_entity *entity, int change)
{
struct v4l2_subdev *subdev;
subdev = is_media_entity_v4l2_subdev(entity)
? media_entity_to_v4l2_subdev(entity) : NULL;
if (entity->use_count == 0 && change > 0 && subdev) {
int ret;
ret = v4l2_subdev_call(subdev, core, s_power, 1);
if (ret < 0 && ret != -ENOIOCTLCMD)
return ret;
}
entity->use_count += change;
WARN_ON(entity->use_count < 0);
if (entity->use_count == 0 && change < 0 && subdev)
v4l2_subdev_call(subdev, core, s_power, 0);
return 0;
}
/*
* iss_pipeline_pm_power - Apply power change to all entities in a pipeline
* @entity: The entity
* @change: Use count change
*
* Walk the pipeline to update the use count and the power state of all non-node
* entities.
*
* Return 0 on success or a negative error code on failure.
*/
static int iss_pipeline_pm_power(struct media_entity *entity, int change,
struct media_entity_graph *graph)
{
struct media_entity *first = entity;
int ret = 0;
if (!change)
return 0;
media_entity_graph_walk_start(graph, entity);
while (!ret && (entity = media_entity_graph_walk_next(graph)))
if (is_media_entity_v4l2_subdev(entity))
ret = iss_pipeline_pm_power_one(entity, change);
if (!ret)
return 0;
media_entity_graph_walk_start(graph, first);
while ((first = media_entity_graph_walk_next(graph)) &&
first != entity)
if (is_media_entity_v4l2_subdev(first))
iss_pipeline_pm_power_one(first, -change);
return ret;
}
/*
* omap4iss_pipeline_pm_use - Update the use count of an entity
* @entity: The entity
* @use: Use (1) or stop using (0) the entity
*
* Update the use count of all entities in the pipeline and power entities on or
* off accordingly.
*
* Return 0 on success or a negative error code on failure. Powering entities
* off is assumed to never fail. No failure can occur when the use parameter is
* set to 0.
*/
int omap4iss_pipeline_pm_use(struct media_entity *entity, int use,
struct media_entity_graph *graph)
{
int change = use ? 1 : -1;
int ret;
mutex_lock(&entity->graph_obj.mdev->graph_mutex);
/* Apply use count to node. */
entity->use_count += change;
WARN_ON(entity->use_count < 0);
/* Apply power change to connected non-nodes. */
ret = iss_pipeline_pm_power(entity, change, graph);
if (ret < 0)
entity->use_count -= change;
mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
return ret;
}
/*
* iss_pipeline_link_notify - Link management notification callback
* @link: The link
* @flags: New link flags that will be applied
*
* React to link management on powered pipelines by updating the use count of
* all entities in the source and sink sides of the link. Entities are powered
* on or off accordingly.
*
* Return 0 on success or a negative error code on failure. Powering entities
* off is assumed to never fail. This function will not fail for disconnection
* events.
*/
static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
unsigned int notification)
{
struct media_entity_graph *graph =
&container_of(link->graph_obj.mdev, struct iss_device,
media_dev)->pm_count_graph;
struct media_entity *source = link->source->entity;
struct media_entity *sink = link->sink->entity;
int source_use;
int sink_use;
int ret;
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
ret = media_entity_graph_walk_init(graph,
link->graph_obj.mdev);
if (ret)
return ret;
}
source_use = iss_pipeline_pm_use_count(source, graph);
sink_use = iss_pipeline_pm_use_count(sink, graph);
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
!(flags & MEDIA_LNK_FL_ENABLED)) {
/* Powering off entities is assumed to never fail. */
iss_pipeline_pm_power(source, -sink_use, graph);
iss_pipeline_pm_power(sink, -source_use, graph);
return 0;
}
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
(flags & MEDIA_LNK_FL_ENABLED)) {
ret = iss_pipeline_pm_power(source, sink_use, graph);
if (ret < 0)
return ret;
ret = iss_pipeline_pm_power(sink, source_use, graph);
if (ret < 0)
iss_pipeline_pm_power(source, -sink_use, graph);
}
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH)
media_entity_graph_walk_cleanup(graph);
return ret;
}
/* -----------------------------------------------------------------------------
* Pipeline stream management
*/
@ -1197,7 +988,7 @@ static int iss_register_entities(struct iss_device *iss)
strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
sizeof(iss->media_dev.model));
iss->media_dev.hw_revision = iss->revision;
iss->media_dev.link_notify = iss_pipeline_link_notify;
iss->media_dev.link_notify = v4l2_pipeline_link_notify;
ret = media_device_register(&iss->media_dev);
if (ret < 0) {
dev_err(iss->dev, "Media device registration failed (%d)\n",

6
drivers/staging/media/omap4iss/iss.h
View File

@ -15,6 +15,8 @@
#define _OMAP4_ISS_H_
#include <media/v4l2-device.h>
#include <media/v4l2-mc.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/platform_device.h>
@ -87,7 +89,6 @@ struct iss_reg {
struct iss_device {
struct v4l2_device v4l2_dev;
struct media_device media_dev;
struct media_entity_graph pm_count_graph;
struct device *dev;
u32 revision;
@ -152,9 +153,6 @@ void omap4iss_isp_subclk_enable(struct iss_device *iss,
void omap4iss_isp_subclk_disable(struct iss_device *iss,
enum iss_isp_subclk_resource res);
int omap4iss_pipeline_pm_use(struct media_entity *entity, int use,
struct media_entity_graph *graph);
int omap4iss_register_entities(struct platform_device *pdev,
struct v4l2_device *v4l2_dev);
void omap4iss_unregister_entities(struct platform_device *pdev);

15
drivers/staging/media/omap4iss/iss_video.c
View File

@ -19,8 +19,10 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mc.h>
#include "iss_video.h"
#include "iss.h"
@ -1009,13 +1011,7 @@ static int iss_video_open(struct file *file)
goto done;
}
ret = media_entity_graph_walk_init(&handle->graph,
&video->iss->media_dev);
if (ret)
goto done;
ret = omap4iss_pipeline_pm_use(&video->video.entity, 1,
&handle->graph);
ret = v4l2_pipeline_pm_use(&video->video.entity, 1);
if (ret < 0) {
omap4iss_put(video->iss);
goto done;
@ -1054,7 +1050,6 @@ static int iss_video_open(struct file *file)
done:
if (ret < 0) {
v4l2_fh_del(&handle->vfh);
media_entity_graph_walk_cleanup(&handle->graph);
kfree(handle);
}
@ -1070,13 +1065,11 @@ static int iss_video_release(struct file *file)
/* Disable streaming and free the buffers queue resources. */
iss_video_streamoff(file, vfh, video->type);
omap4iss_pipeline_pm_use(&video->video.entity, 0, &handle->graph);
v4l2_pipeline_pm_use(&video->video.entity, 0);
/* Release the videobuf2 queue */
vb2_queue_release(&handle->queue);
/* Release the file handle. */
media_entity_graph_walk_cleanup(&handle->graph);
v4l2_fh_del(vfh);
kfree(handle);
file->private_data = NULL;

1
drivers/staging/media/omap4iss/iss_video.h
View File

@ -183,7 +183,6 @@ struct iss_video_fh {
struct vb2_queue queue;
struct v4l2_format format;
struct v4l2_fract timeperframe;
struct media_entity_graph graph;
};
#define to_iss_video_fh(fh) container_of(fh, struct iss_video_fh, vfh)