libcamera: pipeline: rkisp1: Fix media bus propagation for NV{12,21}

The upstream driver has changed how the link formats are validated when
starting to stream [1]. This revealed that libcamera did not adjust the
media bus format from the link between {main,self} resizer source pad
and the capture video device as expected by the driver.

The media bus code YUYV8_2X8 was hardcoded to MEDIA_BUS_FMT_YUYV8_2X8
for all pixel formats while it must be adjusted to YUYV8_1_5X8 for NV12
and NV21, fix this.

1. 6803a9e0e1e43e9e ("media: staging: rkisp1: cap: simplify link validation by comparing media bus code")

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/pipeline/rkisp1/rkisp1_path.cpp

@@ -7,6 +7,8 @@
 
 #include "rkisp1_path.h"
 
+#include <linux/media-bus-format.h>
+
 #include <libcamera/formats.h>
 #include <libcamera/stream.h>
 
@@ -125,6 +127,16 @@ int RkISP1Path::configure(const StreamConfiguration &config,
 		<< "Configuring " << name_ << " resizer output pad with "
 		<< ispFormat.toString();
 
+	switch (config.pixelFormat) {
+	case formats::NV12:
+	case formats::NV21:
+		ispFormat.mbus_code = MEDIA_BUS_FMT_YUYV8_1_5X8;
+		break;
+	default:
+		ispFormat.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8;
+		break;
+	}
+
 	ret = resizer_->setFormat(1, &ispFormat);
 	if (ret < 0)
 		return ret;