target/linux/bcm27xx/patches-5.15/950-0511-staging-bcm2835_codec-Correct-flushing-code-for-refc.patch

   1 From cd850cb03a564c948db4db8cac672284c55cefc3 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 22 Sep 2021 16:42:49 +0100
   4 Subject: [PATCH] staging: bcm2835_codec: Correct flushing code for
   5  refcounting
   6
   7 Completions don't reference count, so setting the completion
   8 on the first buffer returned and then not reinitialising it
   9 means that the flush function doesn't behave as intended.
  10
  11 Signal the completion when the last buffer is returned.
  12
  13 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  14 ---
  15  .../bcm2835-codec/bcm2835-v4l2-codec.c        | 20 ++++++++++++++-----
  16  1 file changed, 15 insertions(+), 5 deletions(-)
  17
  18 --- a/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  19 +++ b/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  20 @@ -934,7 +934,7 @@ static void ip_buffer_cb(struct vchiq_mm
  21         v4l2_dbg(2, debug, &ctx->dev->v4l2_dev, "%s: done %d input buffers\n",
  22                  __func__, ctx->num_ip_buffers);
  23
  24 -       if (!port->enabled)
  25 +       if (!port->enabled && atomic_read(&port->buffers_with_vpu))
  26                 complete(&ctx->frame_cmplt);
  27  }
  28
  29 @@ -1135,7 +1135,8 @@ static void op_buffer_cb(struct vchiq_mm
  30                          __func__, mmal_buf->mmal_flags);
  31                 if (!(mmal_buf->mmal_flags & MMAL_BUFFER_HEADER_FLAG_EOS)) {
  32                         vb2_buffer_done(&vb2->vb2_buf, VB2_BUF_STATE_QUEUED);
  33 -                       if (!port->enabled)
  34 +                       if (!port->enabled &&
  35 +                           atomic_read(&port->buffers_with_vpu))
  36                                 complete(&ctx->frame_cmplt);
  37                         return;
  38                 }
  39 @@ -1178,7 +1179,7 @@ static void op_buffer_cb(struct vchiq_mm
  40         v4l2_dbg(2, debug, &ctx->dev->v4l2_dev, "%s: done %d output buffers\n",
  41                  __func__, ctx->num_op_buffers);
  42
  43 -       if (!port->enabled)
  44 +       if (!port->enabled && atomic_read(&port->buffers_with_vpu))
  45                 complete(&ctx->frame_cmplt);
  46  }
  47
  48 @@ -1596,6 +1597,8 @@ static int vidioc_s_fmt(struct bcm2835_c
  49                 return 0;
  50
  51         if (port->enabled) {
  52 +               unsigned int num_buffers;
  53 +
  54                 /*
  55                  * This should only ever happen with DECODE and the MMAL output
  56                  * port that has been enabled for resolution changed events.
  57 @@ -1606,10 +1609,18 @@ static int vidioc_s_fmt(struct bcm2835_c
  58                         f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
  59                         atomic_read(&port->buffers_with_vpu));
  60
  61 +               /*
  62 +                * Disable will reread the port format, so retain buffer count.
  63 +                */
  64 +               num_buffers = port->current_buffer.num;
  65 +
  66                 ret = vchiq_mmal_port_disable(ctx->dev->instance, port);
  67                 if (ret)
  68                         v4l2_err(&ctx->dev->v4l2_dev, "%s: Error disabling port update buffer count, ret %d\n",
  69                                  __func__, ret);
  70 +
  71 +               port->current_buffer.num = num_buffers;
  72 +
  73                 reenable_port = true;
  74         }
  75
  76 @@ -2787,7 +2798,7 @@ static void bcm2835_codec_flush_buffers(
  77  {
  78         int ret;
  79
  80 -       while (atomic_read(&port->buffers_with_vpu)) {
  81 +       if (atomic_read(&port->buffers_with_vpu)) {
  82                 v4l2_dbg(1, debug, &ctx->dev->v4l2_dev, "%s: Waiting for buffers to be returned - %d outstanding\n",
  83                          __func__, atomic_read(&port->buffers_with_vpu));
  84                 ret = wait_for_completion_timeout(&ctx->frame_cmplt,
  85 @@ -2796,7 +2807,6 @@ static void bcm2835_codec_flush_buffers(
  86                         v4l2_err(&ctx->dev->v4l2_dev, "%s: Timeout waiting for buffers to be returned - %d outstanding\n",
  87                                  __func__,
  88                                  atomic_read(&port->buffers_with_vpu));
  89 -                       break;
  90                 }
  91         }
  92  }