OpenWrt – Rev 4
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From 13e015450812772f21c874dd310abe3379b87bb5 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Thu, 28 Jun 2018 15:57:25 +0100
Subject: [PATCH 404/454] staging: bcm2835_camera: Ensure all buffers are
returned on disable
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: 9384167 "staging: bcm2835-camera: Remove V4L2/MMAL buffer remapping"
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
.../bcm2835-camera/bcm2835-camera.c | 16 ++++++++++++++++
.../vc04_services/bcm2835-camera/mmal-vchiq.c | 4 ++++
.../vc04_services/bcm2835-camera/mmal-vchiq.h | 3 +++
3 files changed, 23 insertions(+)
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -615,6 +615,7 @@ static void stop_streaming(struct vb2_qu
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);
@@ -658,6 +659,21 @@ static void stop_streaming(struct vb2_qu
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));
+ ret = wait_for_completion_timeout(&dev->capture.frame_cmplt,
+ HZ);
+ if (ret <= 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");
}
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
@@ -318,6 +318,8 @@ static void buffer_work_cb(struct work_s
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,
@@ -461,6 +463,8 @@ buffer_from_host(struct vchiq_mmal_insta
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 */
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
@@ -75,6 +75,9 @@ 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 */