ipa: rkisp1: Add AF algorithm basing on common AfHillClimbing class

Rockchip ISP AF block allows calculation of sharpness and luminance
in up to three user defined windows. If no windows are set, there are
some default settings applied for the first window and exposed through
the driver. For each frame, use the sharpness value calculated for this
default window and feed the hill climbing algorithm with them. Then set
the lens position to value calculated by the algorithm.

Signed-off-by: Daniel Semkowicz <dse@thaumatec.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/af.h b/src/ipa/rkisp1/algorithms/af.h
new file mode 100644
index 00000000..882be952
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/af.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2022, Theobroma Systems
+ *
+ * af.h - RkISP1 AF hill climbing based control algorithm
+ */
+
+#pragma once
+
+#include <linux/rkisp1-config.h>
+
+#include "libipa/algorithms/af_hill_climbing.h"
+
+#include "algorithm.h"
+
+namespace libcamera::ipa::rkisp1::algorithms {
+
+class Af : public ipa::common::algorithms::AfHillClimbing, public Algorithm
+{
+public:
+	Af() = default;
+	~Af() = default;
+
+	int init(IPAContext &context, const YamlObject &tuningData) override;
+	int configure(IPAContext &context, const IPACameraSensorInfo &configInfo) override;
+	void queueRequest(IPAContext &context, const uint32_t frame,
+			  IPAFrameContext &frameContext, const ControlList &controls) override;
+	void prepare(IPAContext &context, const uint32_t frame,
+		     IPAFrameContext &frameContext, rkisp1_params_cfg *params) override;
+	void process(IPAContext &context, const uint32_t frame,
+		     IPAFrameContext &frameContext, const rkisp1_stat_buffer *stats,
+		     ControlList &metadata) override;
+
+private:
+	void setMeteringMode(controls::AfMeteringEnum metering) final;
+	void setWindows(Span<const Rectangle> windows) final;
+
+	/* Wait number of frames after changing lens position */
+	uint32_t waitFramesLens_;
+};
+
+} /* namespace libcamera::ipa::rkisp1::algorithms */