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staging: bcm2835-camera: Ensure all buffers are returned on disable

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With the recent change to match MMAL and V4L2 buffers there
is a need to wait for all MMAL buffers to be returned during
stop_streaming.

Fixes: 9384167070 ("staging: bcm2835-camera: Remove V4L2/MMAL buffer remapping")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Stevenson 2019-06-29 14:13:29 +02:00 committed by Greg Kroah-Hartman
parent fcdd047e8a
commit 70ec64ccda
3 changed files with 23 additions and 6 deletions
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22
drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
View File

@ -584,6 +584,7 @@ static void stop_streaming(struct vb2_queue *vq)
int ret;
unsigned long timeout;
struct bm2835_mmal_dev *dev = vb2_get_drv_priv(vq);
struct vchiq_mmal_port *port = dev->capture.port;
v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev, "%s: dev:%p\n",
__func__, dev);
@ -607,12 +608,6 @@ static void stop_streaming(struct vb2_queue *vq)
&dev->capture.frame_count,
sizeof(dev->capture.frame_count));
/* wait for last frame to complete */
timeout = wait_for_completion_timeout(&dev->capture.frame_cmplt, HZ);
if (timeout == 0)
v4l2_err(&dev->v4l2_dev,
"timed out waiting for frame completion\n");
v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
"disabling connection\n");
@ -627,6 +622,21 @@ static void stop_streaming(struct vb2_queue *vq)
ret);
}
/* wait for all buffers to be returned */
while (atomic_read(&port->buffers_with_vpu)) {
v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
"%s: Waiting for buffers to be returned - %d outstanding\n",
__func__, atomic_read(&port->buffers_with_vpu));
timeout = wait_for_completion_timeout(&dev->capture.frame_cmplt,
HZ);
if (timeout == 0) {
v4l2_err(&dev->v4l2_dev, "%s: Timeout waiting for buffers to be returned - %d outstanding\n",
__func__,
atomic_read(&port->buffers_with_vpu));
break;
}
}
if (disable_camera(dev) < 0)
v4l2_err(&dev->v4l2_dev, "Failed to disable camera\n");
}

4
drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
View File

@ -246,6 +246,8 @@ static void buffer_work_cb(struct work_struct *work)
struct mmal_msg_context *msg_context =
container_of(work, struct mmal_msg_context, u.bulk.work);
atomic_dec(&msg_context->u.bulk.port->buffers_with_vpu);
msg_context->u.bulk.port->buffer_cb(msg_context->u.bulk.instance,
msg_context->u.bulk.port,
msg_context->u.bulk.status,
@ -389,6 +391,8 @@ buffer_from_host(struct vchiq_mmal_instance *instance,
INIT_WORK(&msg_context->u.bulk.buffer_to_host_work,
buffer_to_host_work_cb);
atomic_inc(&port->buffers_with_vpu);
/* prep the buffer from host message */
memset(&m, 0xbc, sizeof(m)); /* just to make debug clearer */

3
drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
View File

@ -72,6 +72,9 @@ struct vchiq_mmal_port {
struct list_head buffers;
/* lock to serialise adding and removing buffers from list */
spinlock_t slock;
/* Count of buffers the VPU has yet to return */
atomic_t buffers_with_vpu;
/* callback on buffer completion */
vchiq_mmal_buffer_cb buffer_cb;
/* callback context */