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-rw-r--r--src/ipa/rkisp1/algorithms/agc.cpp6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp
index a4e5500e..e5aeb342 100644
--- a/src/ipa/rkisp1/algorithms/agc.cpp
+++ b/src/ipa/rkisp1/algorithms/agc.cpp
@@ -36,6 +36,9 @@ namespace ipa::rkisp1::algorithms {
LOG_DEFINE_CATEGORY(RkISP1Agc)
+/* Minimum limit for analogue gain value */
+static constexpr double kMinAnalogueGain = 1.0;
+
/* \todo Honour the FrameDurationLimits control instead of hardcoding a limit */
static constexpr utils::Duration kMaxShutterSpeed = 60ms;
@@ -254,7 +257,8 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext &frameContext,
utils::Duration maxShutterSpeed = std::min(configuration.sensor.maxShutterSpeed,
kMaxShutterSpeed);
- double minAnalogueGain = configuration.sensor.minAnalogueGain;
+ double minAnalogueGain = std::max(configuration.sensor.minAnalogueGain,
+ kMinAnalogueGain);
double maxAnalogueGain = configuration.sensor.maxAnalogueGain;
/* Consider within 1% of the target as correctly exposed. */