From 42e18c96bcb70a00d2fefce2ff01bc58dbdd7389 Mon Sep 17 00:00:00 2001
From: Stefan Klug <stefan.klug@ideasonboard.com>
Date: Mon, 7 Jul 2025 10:55:07 +0200
Subject: [PATCH] libipa: agc_mean_luminance: Add debug logging

When debugging the AEGC it is important to know when the constraints
apply. As this is important information for anyone doing tuning file
optimization, add it upstream.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 src/ipa/libipa/agc_mean_luminance.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/ipa/libipa/agc_mean_luminance.cpp b/src/ipa/libipa/agc_mean_luminance.cpp
index d37a9b66..ebdb4d75 100644
--- a/src/ipa/libipa/agc_mean_luminance.cpp
+++ b/src/ipa/libipa/agc_mean_luminance.cpp
@@ -467,12 +467,20 @@ double AgcMeanLuminance::constraintClampGain(uint32_t constraintModeIndex,
 				 hist.interQuantileMean(constraint.qLo, constraint.qHi);
 
 		if (constraint.bound == AgcConstraint::Bound::Lower &&
-		    newGain > gain)
+		    newGain > gain) {
 			gain = newGain;
+			LOG(AgcMeanLuminance, Debug)
+				<< "Apply lower bound: " << gain << " to "
+				<< newGain;
+		}
 
 		if (constraint.bound == AgcConstraint::Bound::Upper &&
-		    newGain < gain)
+		    newGain < gain) {
 			gain = newGain;
+			LOG(AgcMeanLuminance, Debug)
+				<< "Apply upper bound: " << gain << " to "
+				<< newGain;
+		}
 	}
 
 	return gain;