diff --git a/src/libcamera/software_isp/debayer.cpp b/src/libcamera/software_isp/debayer.cpp
index 4b6bab7f..25d83e88 100644
--- a/src/libcamera/software_isp/debayer.cpp
+++ b/src/libcamera/software_isp/debayer.cpp
@@ -336,6 +336,31 @@ Debayer::~Debayer()
  * debayer processing.
  */
 
+/**
+ * \fn int Debayer::start()
+ * \brief Execute a start signal in the debayer object from workerthread context
+ *
+ * The start() method is invoked so that a Debayer object can initialise
+ * internal variables or data. It is called from the software_isp::start
+ * method.
+ *
+ * This method is particularly useful with DebayerEGL as it allows for the
+ * initialisation of the EGL stack after configure in a thread-safe manner.
+ */
+
+/**
+ * \fn void Debayer::stop()
+ * \brief Stop the debayering process and perform cleanup
+ *
+ * The stop() method is invoked as the logically corollary of start().
+ * Debayer::stop() will be called by software_isp::stop() allowing for any
+ * cleanup which should happend with stop().
+ *
+ * The stop method similar to start() is useful for DebayerEGL as it allows
+ * for cleanup of EGL context and/or data that happens in
+ * DebayerEGL::start.
+ */
+
 /**
  * \fn void Debayer::setParams(DebayerParams &params)
  * \brief Select the bayer params to use for the next frame debayer
diff --git a/src/libcamera/software_isp/debayer.h b/src/libcamera/software_isp/debayer.h
index 807dfabc..b8287166 100644
--- a/src/libcamera/software_isp/debayer.h
+++ b/src/libcamera/software_isp/debayer.h
@@ -48,6 +48,8 @@ public:
 	strideAndFrameSize(const PixelFormat &outputFormat, const Size &size) = 0;
 
 	virtual void process(uint32_t frame, FrameBuffer *input, FrameBuffer *output, DebayerParams params) = 0;
+	virtual int start() { return 0; }
+	virtual void stop() {}
 
 	virtual SizeRange sizes(PixelFormat inputFormat, const Size &inputSize) = 0;
 
diff --git a/src/libcamera/software_isp/software_isp.cpp b/src/libcamera/software_isp/software_isp.cpp
index 928a2520..7c9ad916 100644
--- a/src/libcamera/software_isp/software_isp.cpp
+++ b/src/libcamera/software_isp/software_isp.cpp
@@ -347,7 +347,9 @@ int SoftwareIsp::start()
 		return ret;
 
 	ispWorkerThread_.start();
-	return 0;
+
+	return debayer_->invokeMethod(&DebayerCpu::start,
+				      ConnectionTypeBlocking);
 }
 
 /**
@@ -358,9 +360,11 @@ int SoftwareIsp::start()
  */
 void SoftwareIsp::stop()
 {
+	debayer_->invokeMethod(&DebayerCpu::stop,
+			       ConnectionTypeBlocking);
+
 	ispWorkerThread_.exit();
 	ispWorkerThread_.wait();
-	ispWorkerThread_.removeMessages(debayer_.get());
 
 	Thread::current()->dispatchMessages(Message::Type::InvokeMessage, this);