target/linux/brcm2708/patches-4.14/950-0404-staging-bcm2835_camera-Ensure-all-buffers-are-return.patch

   1 From 13e015450812772f21c874dd310abe3379b87bb5 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Thu, 28 Jun 2018 15:57:25 +0100
   4 Subject: [PATCH 404/454] staging: bcm2835_camera: Ensure all buffers are
   5  returned on disable
   6
   7 With the recent change to match MMAL and V4L2 buffers there
   8 is a need to wait for all MMAL buffers to be returned during
   9 stop_streaming.
  10
  11 Fixes: 9384167 "staging: bcm2835-camera: Remove V4L2/MMAL buffer remapping"
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  13 ---
  14  .../bcm2835-camera/bcm2835-camera.c              | 16 ++++++++++++++++
  15  .../vc04_services/bcm2835-camera/mmal-vchiq.c    |  4 ++++
  16  .../vc04_services/bcm2835-camera/mmal-vchiq.h    |  3 +++
  17  3 files changed, 23 insertions(+)
  18
  19 --- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
  20 +++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
  21 @@ -615,6 +615,7 @@ static void stop_streaming(struct vb2_qu
  22         int ret;
  23         unsigned long timeout;
  24         struct bm2835_mmal_dev *dev = vb2_get_drv_priv(vq);
  25 +       struct vchiq_mmal_port *port = dev->capture.port;
  26
  27         v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev, "%s: dev:%p\n",
  28                  __func__, dev);
  29 @@ -658,6 +659,21 @@ static void stop_streaming(struct vb2_qu
  30                          ret);
  31         }
  32
  33 +       /* wait for all buffers to be returned */
  34 +       while (atomic_read(&port->buffers_with_vpu)) {
  35 +               v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
  36 +                        "%s: Waiting for buffers to be returned - %d outstanding\n",
  37 +                        __func__, atomic_read(&port->buffers_with_vpu));
  38 +               ret = wait_for_completion_timeout(&dev->capture.frame_cmplt,
  39 +                                                 HZ);
  40 +               if (ret <= 0) {
  41 +                       v4l2_err(&dev->v4l2_dev, "%s: Timeout waiting for buffers to be returned - %d outstanding\n",
  42 +                                __func__,
  43 +                                atomic_read(&port->buffers_with_vpu));
  44 +                       break;
  45 +               }
  46 +       }
  47 +
  48         if (disable_camera(dev) < 0)
  49                 v4l2_err(&dev->v4l2_dev, "Failed to disable camera\n");
  50  }
  51 --- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
  52 +++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
  53 @@ -318,6 +318,8 @@ static void buffer_work_cb(struct work_s
  54         struct mmal_msg_context *msg_context =
  55                 container_of(work, struct mmal_msg_context, u.bulk.work);
  56
  57 +       atomic_dec(&msg_context->u.bulk.port->buffers_with_vpu);
  58 +
  59         msg_context->u.bulk.port->buffer_cb(msg_context->u.bulk.instance,
  60                                             msg_context->u.bulk.port,
  61                                             msg_context->u.bulk.status,
  62 @@ -461,6 +463,8 @@ buffer_from_host(struct vchiq_mmal_insta
  63         INIT_WORK(&msg_context->u.bulk.buffer_to_host_work,
  64                   buffer_to_host_work_cb);
  65
  66 +       atomic_inc(&port->buffers_with_vpu);
  67 +
  68         /* prep the buffer from host message */
  69         memset(&m, 0xbc, sizeof(m));    /* just to make debug clearer */
  70
  71 --- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
  72 +++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.h
  73 @@ -75,6 +75,9 @@ struct vchiq_mmal_port {
  74         struct list_head buffers;
  75         /* lock to serialise adding and removing buffers from list */
  76         spinlock_t slock;
  77 +
  78 +       /* Count of buffers the VPU has yet to return */
  79 +       atomic_t buffers_with_vpu;
  80         /* callback on buffer completion */
  81         vchiq_mmal_buffer_cb buffer_cb;
  82         /* callback context */