target/linux/bcm27xx/patches-5.4/950-0661-media-bcm2835-unicam-Add-support-for-the-FRAME_SYNC-.patch

   1 From 20caa3607c972f5c28b3e9aceb0b8a1d2094c0a7 Mon Sep 17 00:00:00 2001
   2 From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   3 Date: Tue, 24 Mar 2020 23:13:02 +0200
   4 Subject: [PATCH] media: bcm2835-unicam: Add support for the FRAME_SYNC
   5  event
   6
   7 The FRAME_SYNC event is useful for userspace image processing algorithms
   8 to program the camera sensor as early as possible after frame start.
   9 Support it.
  10
  11 Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  12 Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
  13 Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
  14 Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
  15 ---
  16  drivers/media/platform/bcm2835/bcm2835-unicam.c | 14 ++++++++++++++
  17  1 file changed, 14 insertions(+)
  18
  19 --- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
  20 +++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
  21 @@ -772,6 +772,16 @@ static int unicam_all_nodes_disabled(str
  22                !dev->node[METADATA_PAD].streaming;
  23  }
  24
  25 +static void unicam_queue_event_sof(struct unicam_device *unicam)
  26 +{
  27 +       struct v4l2_event event = {
  28 +               .type = V4L2_EVENT_FRAME_SYNC,
  29 +               .u.frame_sync.frame_sequence = unicam->sequence,
  30 +       };
  31 +
  32 +       v4l2_event_queue(&unicam->node[IMAGE_PAD].video_dev, &event);
  33 +}
  34 +
  35  /*
  36   * unicam_isr : ISR handler for unicam capture
  37   * @irq: irq number
  38 @@ -853,6 +863,8 @@ static irqreturn_t unicam_isr(int irq, v
  39                          */
  40                         unicam_schedule_dummy_buffer(&unicam->node[i]);
  41                 }
  42 +
  43 +               unicam_queue_event_sof(unicam);
  44         }
  45         /*
  46          * Cannot swap buffer at frame end, there may be a race condition
  47 @@ -2022,6 +2034,8 @@ static int unicam_subscribe_event(struct
  48                                   const struct v4l2_event_subscription *sub)
  49  {
  50         switch (sub->type) {
  51 +       case V4L2_EVENT_FRAME_SYNC:
  52 +               return v4l2_event_subscribe(fh, sub, 2, NULL);
  53         case V4L2_EVENT_SOURCE_CHANGE:
  54                 return v4l2_event_subscribe(fh, sub, 4, NULL);
  55         }