ipa: raspberrypi: Add hardware configuration to the controller

Add a new Controller::HardwareConfig structure that captures the
hardware statistics grid/histogram sizes and pipeline widths. This
ensures there is a single centralised places for these parameters.

Add a getHardwareConfig() helper function to retrieve these values for a
given hardware target.

Update the statistics populating routine in the IPA to use the values
from this structure instead of the hardcoded numbers.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/controller.cpp b/src/ipa/raspberrypi/controller/controller.cpp
index a6250ee1..fa172113 100644
--- a/src/ipa/raspberrypi/controller/controller.cpp
+++ b/src/ipa/raspberrypi/controller/controller.cpp
@@ -20,6 +20,25 @@ using namespace libcamera;
 
 LOG_DEFINE_CATEGORY(RPiController)
 
+static const std::map<std::string, Controller::HardwareConfig> HardwareConfigMap = {
+	{
+		"bcm2835",
+		{
+			/*
+			 * There are only ever 15 AGC regions computed by the firmware
+			 * due to zoning, but the HW defines AGC_REGIONS == 16!
+			 */
+			.agcRegions = { 15 , 1 },
+			.agcZoneWeights = { 15 , 1 },
+			.awbRegions = { 16, 12 },
+			.focusRegions = { 4, 3 },
+			.numHistogramBins = 128,
+			.numGammaPoints = 33,
+			.pipelineWidth = 13
+		}
+	},
+};
+
 Controller::Controller()
 	: switchModeCalled_(false)
 {
@@ -148,3 +167,15 @@ const std::string &Controller::getTarget() const
 {
 	return target_;
 }
+
+const Controller::HardwareConfig &Controller::getHardwareConfig() const
+{
+	auto cfg = HardwareConfigMap.find(getTarget());
+
+	/*
+	 * This really should not happen, the IPA ought to validate the target
+	 * on initialisation.
+	 */
+	ASSERT(cfg != HardwareConfigMap.end());
+	return cfg->second;
+}