diff --git a/include/libcamera/ipa/soft.mojom b/include/libcamera/ipa/soft.mojom
index ddccd154..347fd69b 100644
--- a/include/libcamera/ipa/soft.mojom
+++ b/include/libcamera/ipa/soft.mojom
@@ -24,6 +24,7 @@ interface IPASoftInterface {
 		=> (int32 ret);
 
 	[async] queueRequest(uint32 frame, libcamera.ControlList sensorControls);
+	[async] fillParamsBuffer(uint32 frame);
 	[async] processStats(uint32 frame,
 			     uint32 bufferId,
 			     libcamera.ControlList sensorControls);
diff --git a/src/ipa/simple/soft_simple.cpp b/src/ipa/simple/soft_simple.cpp
index eb3bbd92..3a0cb6e0 100644
--- a/src/ipa/simple/soft_simple.cpp
+++ b/src/ipa/simple/soft_simple.cpp
@@ -79,6 +79,7 @@ public:
 	void stop() override;
 
 	void queueRequest(const uint32_t frame, const ControlList &controls) override;
+	void fillParamsBuffer(const uint32_t frame) override;
 	void processStats(const uint32_t frame, const uint32_t bufferId,
 			  const ControlList &sensorControls) override;
 
@@ -279,6 +280,13 @@ void IPASoftSimple::queueRequest(const uint32_t frame, const ControlList &contro
 		algo->queueRequest(context_, frame, frameContext, controls);
 }
 
+void IPASoftSimple::fillParamsBuffer(const uint32_t frame)
+{
+	IPAFrameContext &frameContext = context_.frameContexts.get(frame);
+	for (auto const &algo : algorithms())
+		algo->prepare(context_, frame, frameContext, params_);
+}
+
 void IPASoftSimple::processStats([[maybe_unused]] const uint32_t frame,
 				 [[maybe_unused]] const uint32_t bufferId,
 				 const ControlList &sensorControls)
diff --git a/src/libcamera/software_isp/software_isp.cpp b/src/libcamera/software_isp/software_isp.cpp
index eda18947..564e44e8 100644
--- a/src/libcamera/software_isp/software_isp.cpp
+++ b/src/libcamera/software_isp/software_isp.cpp
@@ -352,6 +352,7 @@ void SoftwareIsp::stop()
  */
 void SoftwareIsp::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output)
 {
+	ipa_->fillParamsBuffer(frame);
 	debayer_->invokeMethod(&DebayerCpu::process,
 			       ConnectionTypeQueued, frame, input, output, debayerParams_);
 }