ipa: rkisp1: algorithms: agc: Check for correct stats type

Sometimes the ISP produces statistics only with a subset of statistic
types being valid. It doesn't happen normally, but was observed in the
wild. Check for the RKISP1_CIF_ISP_STAT_AUTOEXP bit to prevent using
invalid or outdated data. As it doesn't happen regularly add an error
message to get notified when it happens.

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

Author: Stefan Klug

src/ipa/rkisp1/algorithms/agc.cpp

@@ -402,6 +402,12 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 		fillMetadata(context, frameContext, metadata);
 		return;
 	}
+	
+	if (!(stats->meas_type & RKISP1_CIF_ISP_STAT_AUTOEXP)) {
+		fillMetadata(context, frameContext, metadata);
+		LOG(RkISP1Agc, Error) << "AUTOEXP data is missing in statistics";
+		return;
+	}
 
 	/*
 	 * \todo Verify that the exposure and gain applied by the sensor for
@@ -412,7 +418,6 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 	 */
 
 	const rkisp1_cif_isp_stat *params = &stats->params;
-	ASSERT(stats->meas_type & RKISP1_CIF_ISP_STAT_AUTOEXP);
 
 	/* The lower 4 bits are fractional and meant to be discarded. */
 	Histogram hist({ params->hist.hist_bins, context.hw->numHistogramBins },