ipa: rkisp1: agc: Rename frame context update variable to updateMetering

The frame context agc.update variable is used to indicate if the ISP
histogram metering parameters need to be updated. Rename it to
updateMetering to make usage more explicit.

Suggested-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/rkisp1/algorithms/agc.cpp

@@ -250,7 +250,7 @@ void Agc::queueRequest(IPAContext &context,
 
 	const auto &meteringMode = controls.get(controls::AeMeteringMode);
 	if (meteringMode) {
-		frameContext.agc.update = agc.meteringMode != *meteringMode;
+		frameContext.agc.updateMetering = agc.meteringMode != *meteringMode;
 		agc.meteringMode =
 			static_cast<controls::AeMeteringModeEnum>(*meteringMode);
 	}
@@ -288,7 +288,7 @@ void Agc::prepare(IPAContext &context, const uint32_t frame,
 		frameContext.agc.gain = context.activeState.agc.automatic.gain;
 	}
 
-	if (frame > 0 && !frameContext.agc.update)
+	if (frame > 0 && !frameContext.agc.updateMetering)
 		return;
 
 	/* Configure the measurement window. */

src/ipa/rkisp1/ipa_context.cpp

@@ -317,8 +317,8 @@ namespace libcamera::ipa::rkisp1 {
  * \var IPAFrameContext::agc.maxFrameDuration
  * \brief Maximum frame duration as set by the FrameDurationLimits control
  *
- * \var IPAFrameContext::agc.update
- * \brief Indicate if new ISP parameters need to be applied
+ * \var IPAFrameContext::agc.updateMetering
+ * \brief Indicate if new ISP AGC metering parameters need to be applied
  */
 
 /**

src/ipa/rkisp1/ipa_context.h

@@ -123,7 +123,7 @@ struct IPAFrameContext : public FrameContext {
 		controls::AeExposureModeEnum exposureMode;
 		controls::AeMeteringModeEnum meteringMode;
 		utils::Duration maxFrameDuration;
-		bool update;
+		bool updateMetering;
 	} agc;
 
 	struct {