ipa: rpi: Add FE globals as a parameter to applyDecompand()

Don't let applyDecompand() directly change the FE global enables.
Instead pass the global mask into the function and set it in the caller.
This will be needed when a future commit will add setting the decompand
initial values.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>

Author: naushir

src/ipa/rpi/pisp/pisp.cpp

@@ -256,7 +256,7 @@ class IpaPiSP final : public IpaBase
 	void applyLensShading(const AlscStatus *alscStatus,
 			      pisp_be_global_config &global);
 	void applyDPC(const DpcStatus *dpcStatus, pisp_be_global_config &global);
-	void applyDecompand(const DecompandStatus *decompandStatus);
+	void applyDecompand(const DecompandStatus *decompandStatus, pisp_fe_global_config &feGlobal);
 	void applySdn(const SdnStatus *sdnStatus, pisp_be_global_config &global);
 	void applyTdn(const TdnStatus *tdnStatus, const DeviceStatus *deviceStatus,
 		      pisp_be_global_config &global);
@@ -368,20 +368,24 @@ void IpaPiSP::platformPrepareIsp([[maybe_unused]] const PrepareParams &params,
 	{
 		/* All Frontend config goes first, we do not want to hold the FE lock for long! */
 		std::scoped_lock<FrontEnd> lf(*fe_);
+		pisp_fe_global_config feGlobal;
+
+		fe_->GetGlobal(feGlobal);
 
 		if (noiseStatus)
 			applyFocusStats(noiseStatus);
 
 		DecompandStatus *decompandStatus =
 			rpiMetadata.getLocked<DecompandStatus>("decompand.status");
 		if (decompandStatus)
-			applyDecompand(decompandStatus);
+			applyDecompand(decompandStatus, feGlobal);
 
 		BlackLevelStatus *blackLevelStatus =
 			rpiMetadata.getLocked<BlackLevelStatus>("black_level.status");
 		if (blackLevelStatus)
 			applyBlackLevel(blackLevelStatus, global);
 
+		fe_->SetGlobal(feGlobal);
 	}
 
 	CacStatus *cacStatus = rpiMetadata.getLocked<CacStatus>("cac.status");
@@ -728,18 +732,15 @@ void IpaPiSP::applyDPC(const DpcStatus *dpcStatus, pisp_be_global_config &global
 	be_->SetDpc(dpc);
 }
 
-void IpaPiSP::applyDecompand(const DecompandStatus *decompandStatus)
+void IpaPiSP::applyDecompand(const DecompandStatus *decompandStatus, pisp_fe_global_config &feGlobal)
 {
-	pisp_fe_global_config feGlobal;
 	pisp_fe_decompand_config decompand = {};
 
-	fe_->GetGlobal(feGlobal);
-
 	if (!generateDecompandLut(decompandStatus->decompandCurve, decompand.lut, PISP_FE_DECOMPAND_LUT_SIZE)) {
 		fe_->SetDecompand(decompand);
 		feGlobal.enables |= PISP_FE_ENABLE_DECOMPAND;
-		fe_->SetGlobal(feGlobal);
-	}
+	} else
+		feGlobal.enables &= ~PISP_FE_ENABLE_DECOMPAND;
 }
 
 void IpaPiSP::applySdn(const SdnStatus *sdnStatus, pisp_be_global_config &global)