ipa: rkisp1: Introduce AWB

The RkISP1 ISP calculates a mean value for Y, Cr and Cb at each frame.
There is a RGB mode which could theoretically give us the values for R,
G and B directly, but it seems to be failing right now.

Convert those values into R, G and B and estimate the gain to apply in a
grey world.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Tested-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index 35e9b8e5..f387cace 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -12,6 +12,8 @@
 
 #include <libcamera/base/utils.h>
 
+#include <libcamera/geometry.h>
+
 namespace libcamera {
 
 namespace ipa::rkisp1 {
@@ -26,6 +28,10 @@ struct IPASessionConfiguration {
 	} agc;
 
 	struct {
+		struct rkisp1_cif_isp_window measureWindow;
+	} awb;
+
+	struct {
 		utils::Duration lineDuration;
 	} sensor;
 
@@ -41,6 +47,16 @@ struct IPAFrameContext {
 	} agc;
 
 	struct {
+		struct {
+			double red;
+			double green;
+			double blue;
+		} gains;
+
+		double temperatureK;
+	} awb;
+
+	struct {
 		uint32_t exposure;
 		double gain;
 	} sensor;