[PATCH 4/4] ipa: rkisp1: Initialize FrameContext.agc.meteringMode

[Jacopo Mondi]

The RkISP1 AGC algorithms assumes the metering mode to be
"MeteringMatrix" and pre-fill an array of weights associated
with it stored in meteringModes_[MeteringMatrix] when intializing
the algorithm in parseMeteringModes().

It laters fetches the weights when computing parameters using the
FrameContext.agc.meteringMode as index of the meteringModes_ array.

When a Request gets queued to the algorithm, the
FrameContext.agc.meteringMode index is populated from the algorithm's
active state, and optionally updated if the application has specified
a different metering mode.

In case of Request underrun however, a non-initialized FrameContext
gets provided to the algorithm, causing an (unhandled) exception when
accessing the meteringModes_ array.

Fix this by intializing the AGC metering mode to a supported value
coming from the ActiveState in IPAFrameContext::init().

Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
---
 src/ipa/rkisp1/algorithms/agc.cpp | 2 ++
 src/ipa/rkisp1/ipa_context.cpp    | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp
index 17d074d9c03e..dd7e9468741e 100644
--- a/src/ipa/rkisp1/algorithms/agc.cpp
+++ b/src/ipa/rkisp1/algorithms/agc.cpp
@@ -175,6 +175,8 @@ int Agc::configure(IPAContext &context, const IPACameraSensorInfo &configInfo)
 		static_cast<controls::AeConstraintModeEnum>(constraintModes().begin()->first);
 	context.activeState.agc.exposureMode =
 		static_cast<controls::AeExposureModeEnum>(exposureModeHelpers().begin()->first);
+
+	/* Use the metering matrix mode by default. */
 	context.activeState.agc.meteringMode =
 		static_cast<controls::AeMeteringModeEnum>(meteringModes_.begin()->first);
 
diff --git a/src/ipa/rkisp1/ipa_context.cpp b/src/ipa/rkisp1/ipa_context.cpp
index 2dad42b3154f..e88609137345 100644
--- a/src/ipa/rkisp1/ipa_context.cpp
+++ b/src/ipa/rkisp1/ipa_context.cpp
@@ -421,6 +421,11 @@ void IPAFrameContext::init(const uint32_t frameNum,
 			   const ActiveState &activeState)
 {
 	FrameContext::init(frameNum, activeState);
+
+	const IPAActiveState *rkisp1ActiveState =
+		reinterpret_cast<const IPAActiveState *>(&activeState);
+
+	agc.meteringMode = rkisp1ActiveState->agc.meteringMode;
 }
 
 /**
-- 
2.47.0