From 16f3d2de50ffa35295240e247d8cc4cffabf1a53 Mon Sep 17 00:00:00 2001
From: Naushir Patuck <naush@raspberrypi.com>
Date: Wed, 6 Apr 2022 13:35:52 +0100
Subject: libcamera: v4l2_videodevice: Add a dequeue timer

Add a timer that gets reset on every buffer dequeue event. If the timeout
expires, optionally call a slot in the pipeline handler to handle this
condition. This may be useful in detecting and handling stalls in either the
hardware or device driver.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 include/libcamera/internal/v4l2_videodevice.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'include')

diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h
index cfeae7bd..9c9493cc 100644
--- a/include/libcamera/internal/v4l2_videodevice.h
+++ b/include/libcamera/internal/v4l2_videodevice.h
@@ -20,7 +20,9 @@
 #include <libcamera/base/class.h>
 #include <libcamera/base/log.h>
 #include <libcamera/base/signal.h>
+#include <libcamera/base/timer.h>
 #include <libcamera/base/unique_fd.h>
+#include <libcamera/base/utils.h>
 
 #include <libcamera/color_space.h>
 #include <libcamera/framebuffer.h>
@@ -217,6 +219,9 @@ public:
 	int streamOn();
 	int streamOff();
 
+	void setDequeueTimeout(utils::Duration timeout);
+	Signal<> dequeueTimeout;
+
 	static std::unique_ptr<V4L2VideoDevice>
 	fromEntityName(const MediaDevice *media, const std::string &entity);
 
@@ -253,6 +258,8 @@ private:
 	void bufferAvailable();
 	FrameBuffer *dequeueBuffer();
 
+	void watchdogExpired();
+
 	V4L2Capability caps_;
 	V4L2DeviceFormat format_;
 	const PixelFormatInfo *formatInfo_;
@@ -266,6 +273,9 @@ private:
 	EventNotifier *fdBufferNotifier_;
 
 	State state_;
+
+	Timer watchdog_;
+	utils::Duration watchdogDuration_;
 };
 
 class V4L2M2MDevice
-- 
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