[PATCH] pipeline: rpi: vc4: Use an unpacked format if no packed one is available

[David Plowman]

When validating a stream, and no valid packed pixel format can be
found, see if an unpacked format can be used instead.

This is particularly helpful for 8 (and 16) bit raw formats, where
asking for a packed format would previously have failed. Now the
configuration will be adjusted to give you a format (in fact, the only
format) that will work.

Signed-off-by: David Plowman <david.plowman at raspberrypi.com>
---
 src/libcamera/pipeline/rpi/vc4/vc4.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/libcamera/pipeline/rpi/vc4/vc4.cpp b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
index a52f0e7a..ad76099b 100644
--- a/src/libcamera/pipeline/rpi/vc4/vc4.cpp
+++ b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
@@ -434,6 +434,16 @@ CameraConfiguration::Status Vc4CameraData::platformValidate(RPi::RPiCameraConfig
 			rawBayer.packing = BayerFormat::Packing::CSI2;
 
 		PixelFormat rawFormat = rawBayer.toPixelFormat();
+
+		/*
+		 * Try for an unpacked format if a packed one wasn't available.This catches
+		 * 8 (and 16) bit formats which would otherwise fail.
+		 */
+		if (!rawFormat.isValid() && rawBayer.packing != BayerFormat::Packing::None) {
+			rawBayer.packing = BayerFormat::Packing::None;
+			rawFormat = rawBayer.toPixelFormat();
+		}
+
 		if (rawStream->pixelFormat != rawFormat ||
 		    rawStream->size != rpiConfig->sensorFormat_.size) {
 			rawStream->pixelFormat = rawFormat;
-- 
2.30.2