[PATCH v4 12/15] config: Allow enabling software ISP in runtime

[Milan Zamazal]

This patch allows enabling or disabling software ISP in runtime in
addition to compile time.  This can be useful for software ISP testing
on various platforms as well as for overriding the defaults in case the
defaults don't work well (e.g. hardware ISP may or may not work on
i.MX8MP depending on the kernel and libcamera patches present in the
given system).

The configuration is specified as follows:

  configuration:
    pipelines:
      simple:
        supported_devices:
        - driver: DRIVER-NAME
          software_isp: BOOLEAN
        - ...

For example:

  configuration:
    pipelines:
      simple:
        supported_devices:
        - driver: mxc-isi
          software_isp: true

The overall configuration of enabling or disabling software ISP may get
dropped in future but this patch is still useful in the meantime.

Signed-off-by: Milan Zamazal <mzamazal at redhat.com>
---
 src/libcamera/pipeline/simple/simple.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 81915573b..78f446fb6 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -32,6 +32,7 @@
 #include "libcamera/internal/camera_sensor.h"
 #include "libcamera/internal/converter.h"
 #include "libcamera/internal/device_enumerator.h"
+#include "libcamera/internal/global_configuration.h"
 #include "libcamera/internal/media_device.h"
 #include "libcamera/internal/pipeline_handler.h"
 #include "libcamera/internal/software_isp/software_isp.h"
@@ -1541,6 +1542,17 @@ bool SimplePipelineHandler::match(DeviceEnumerator *enumerator)
 	}
 
 	swIspEnabled_ = info->swIspEnabled;
+	for (GlobalConfiguration::Configuration entry :
+	     GlobalConfiguration::configuration()
+		     ["pipelines"]["simple"]["supported_devices"]
+			     .asList()) {
+		auto name = entry["driver"].get<std::string>();
+		if (name.has_value() and !name.value().compare(info->driver)) {
+			swIspEnabled_ = entry["software_isp"].get<bool>().value_or(swIspEnabled_);
+			LOG(SimplePipeline, Debug) << "Overriding software ISP to " << swIspEnabled_;
+			break;
+		}
+	}
 
 	/* Locate the sensors. */
 	std::vector<MediaEntity *> sensors = locateSensors(media);
-- 
2.44.1