target/linux/bcm27xx/patches-5.4/950-0747-staging-vc04_services-bcm2835-codec-Avoid-fragmentin.patch

   1 From 39956d31d19658af7a0759e05366d4bc1c04a50a Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Fri, 15 May 2020 13:47:13 +0100
   4 Subject: [PATCH] staging:vc04_services: bcm2835-codec: Avoid
   5  fragmenting buffers
   6
   7 The firmware by default is quite happy to fragment encoded
   8 frames as the original MMAL and IL APIs support this.
   9 V4L2 doesn't, so we need to enable the firmware option to avoid this.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 ---
  13  .../vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c      | 8 ++++++++
  14  1 file changed, 8 insertions(+)
  15
  16 --- a/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  17 +++ b/drivers/staging/vc04_services/bcm2835-codec/bcm2835-v4l2-codec.c
  18 @@ -1972,6 +1972,14 @@ static int bcm2835_codec_create_componen
  19                                               &ctx->component->control,
  20                                               MMAL_PARAMETER_VIDEO_ENCODE_HEADERS_WITH_FRAME,
  21                                               &param, sizeof(param));
  22 +               /*
  23 +                * Avoid fragmenting the buffers over multiple frames (unless
  24 +                * the frame is bigger than the whole buffer)
  25 +                */
  26 +               vchiq_mmal_port_parameter_set(ctx->dev->instance,
  27 +                                             &ctx->component->control,
  28 +                                             MMAL_PARAMETER_MINIMISE_FRAGMENTATION,
  29 +                                             &param, sizeof(param));
  30         } else {
  31                 if (ctx->q_data[V4L2_M2M_DST].sizeimage <
  32                         ctx->component->output[0].minimum_buffer.size)