From 20caa3607c972f5c28b3e9aceb0b8a1d2094c0a7 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Tue, 24 Mar 2020 23:13:02 +0200
Subject: [PATCH] media: bcm2835-unicam: Add support for the FRAME_SYNC
event
The FRAME_SYNC event is useful for userspace image processing algorithms
to program the camera sensor as early as possible after frame start.
Support it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
---
drivers/media/platform/bcm2835/bcm2835-unicam.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -772,6 +772,16 @@ static int unicam_all_nodes_disabled(str
!dev->node[METADATA_PAD].streaming;
}
+static void unicam_queue_event_sof(struct unicam_device *unicam)
+{
+ struct v4l2_event event = {
+ .type = V4L2_EVENT_FRAME_SYNC,
+ .u.frame_sync.frame_sequence = unicam->sequence,
+ };
+
+ v4l2_event_queue(&unicam->node[IMAGE_PAD].video_dev, &event);
+}
+
/*
* unicam_isr : ISR handler for unicam capture
* @irq: irq number
@@ -853,6 +863,8 @@ static irqreturn_t unicam_isr(int irq, v
*/
unicam_schedule_dummy_buffer(&unicam->node[i]);
}
+
+ unicam_queue_event_sof(unicam);
}
/*
* Cannot swap buffer at frame end, there may be a race condition
@@ -2022,6 +2034,8 @@ static int unicam_subscribe_event(struct
const struct v4l2_event_subscription *sub)
{
switch (sub->type) {
+ case V4L2_EVENT_FRAME_SYNC:
+ return v4l2_event_subscribe(fh, sub, 2, NULL);
case V4L2_EVENT_SOURCE_CHANGE:
return v4l2_event_subscribe(fh, sub, 4, NULL);
}