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media: staging: rkisp1: stats: replace locks wq_lock, irq_lock with one lock

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This patch removes two locks in the rkisp1_stats struct:
- The mutex 'wq_lock' that is used to protect the buffers list 'stat'
- The spin_lock 'irq_lock' that is used to protect the
variable 'is_streaming'

It replaces them with one spin_lock 'lock' that protects
both the buffers list and the 'is_streaming' variable.
In later patch the reading of the statistics will move to
the isr so there will be no need for the mutex 'wq_lock'

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Dafna Hirschfeld 2020-06-26 10:51:40 +02:00 committed by Mauro Carvalho Chehab
parent 46c308a964
commit b512ab7a85
2 changed files with 13 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/media/rkisp1/rkisp1-common.h
View File

@ -181,7 +181,7 @@ struct rkisp1_capture {
/*
* struct rkisp1_stats - ISP Statistics device
*
* @irq_lock: buffer queue lock
* @lock: locks the buffer list 'stat' and 'is_streaming'
* @stat: stats buffer list
* @readout_wq: workqueue for statistics information read
*/
@ -189,13 +189,12 @@ struct rkisp1_stats {
struct rkisp1_vdev_node vnode;
struct rkisp1_device *rkisp1;
spinlock_t irq_lock;
spinlock_t lock; /* locks 'is_streaming', and 'stats' */
struct list_head stat;
struct v4l2_format vdev_fmt;
bool is_streaming;
struct workqueue_struct *readout_wq;
struct mutex wq_lock;
};
/*

25
drivers/staging/media/rkisp1/rkisp1-stats.c
View File

@ -133,9 +133,9 @@ static void rkisp1_stats_vb2_buf_queue(struct vb2_buffer *vb)
stats_buf->vaddr[0] = vb2_plane_vaddr(vb, 0);
mutex_lock(&stats_dev->wq_lock);
spin_lock_irq(&stats_dev->lock);
list_add_tail(&stats_buf->queue, &stats_dev->stat);
mutex_unlock(&stats_dev->wq_lock);
spin_unlock_irq(&stats_dev->lock);
}
static int rkisp1_stats_vb2_buf_prepare(struct vb2_buffer *vb)
@ -155,13 +155,13 @@ static void rkisp1_stats_vb2_stop_streaming(struct vb2_queue *vq)
unsigned int i;
/* Make sure no new work queued in isr before draining wq */
spin_lock_irq(&stats->irq_lock);
spin_lock_irq(&stats->lock);
stats->is_streaming = false;
spin_unlock_irq(&stats->irq_lock);
spin_unlock_irq(&stats->lock);
drain_workqueue(stats->readout_wq);
mutex_lock(&stats->wq_lock);
spin_lock_irq(&stats->lock);
for (i = 0; i < RKISP1_ISP_STATS_REQ_BUFS_MAX; i++) {
if (list_empty(&stats->stat))
break;
@ -170,7 +170,7 @@ static void rkisp1_stats_vb2_stop_streaming(struct vb2_queue *vq)
list_del(&buf->queue);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
}
mutex_unlock(&stats->wq_lock);
spin_unlock_irq(&stats->lock);
}
static int
@ -340,14 +340,14 @@ rkisp1_stats_send_measurement(struct rkisp1_stats *stats,
frame_sequence = meas_work->frame_id;
}
mutex_lock(&stats->wq_lock);
spin_lock_irq(&stats->lock);
/* get one empty buffer */
if (!list_empty(&stats->stat)) {
cur_buf = list_first_entry(&stats->stat,
struct rkisp1_buffer, queue);
list_del(&cur_buf->queue);
}
mutex_unlock(&stats->wq_lock);
spin_unlock_irq(&stats->lock);
if (!cur_buf)
return;
@ -396,7 +396,7 @@ void rkisp1_stats_isr(struct rkisp1_stats *stats, u32 isp_ris)
struct rkisp1_isp_readout_work *work;
unsigned int isp_mis_tmp = 0;
spin_lock(&stats->irq_lock);
spin_lock(&stats->lock);
rkisp1_write(rkisp1, RKISP1_STATS_MEAS_MASK, RKISP1_CIF_ISP_ICR);
@ -425,7 +425,7 @@ void rkisp1_stats_isr(struct rkisp1_stats *stats, u32 isp_ris)
}
unlock:
spin_unlock(&stats->irq_lock);
spin_unlock(&stats->lock);
}
static void rkisp1_init_stats(struct rkisp1_stats *stats)
@ -445,10 +445,9 @@ int rkisp1_stats_register(struct rkisp1_stats *stats,
int ret;
stats->rkisp1 = rkisp1;
mutex_init(&stats->wq_lock);
mutex_init(&node->vlock);
INIT_LIST_HEAD(&stats->stat);
spin_lock_init(&stats->irq_lock);
spin_lock_init(&stats->lock);
strscpy(vdev->name, RKISP1_STATS_DEV_NAME, sizeof(vdev->name));
@ -495,7 +494,6 @@ int rkisp1_stats_register(struct rkisp1_stats *stats,
err_release_queue:
vb2_queue_release(vdev->queue);
mutex_destroy(&node->vlock);
mutex_destroy(&stats->wq_lock);
return ret;
}
@ -509,5 +507,4 @@ void rkisp1_stats_unregister(struct rkisp1_stats *stats)
media_entity_cleanup(&vdev->entity);
vb2_queue_release(vdev->queue);
mutex_destroy(&node->vlock);
mutex_destroy(&stats->wq_lock);
}