libcamera: formats: Adding Support for Y12P

Add support for a 12-bit Mono format named formats::R12_CSI2P.

This format is added to support the IMX585 mono sensor, which uses the
MEDIA_BUS_FMT_Y12_1X12 media bus format.

Signed-off-by: will whang <will@willwhang.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>

src/libcamera/bayer_format.cpp

@@ -184,6 +184,8 @@ const std::map<BayerFormat, Formats, BayerFormatComparator> bayerToFormat{
 		{ formats::R10_CSI2P, V4L2PixelFormat(V4L2_PIX_FMT_Y10P) } },
 	{ { BayerFormat::MONO, 12, BayerFormat::Packing::None },
 		{ formats::R12, V4L2PixelFormat(V4L2_PIX_FMT_Y12) } },
+	{ { BayerFormat::MONO, 12, BayerFormat::Packing::CSI2 },
+		{ formats::R12_CSI2P, V4L2PixelFormat(V4L2_PIX_FMT_Y12P) } },
 	{ { BayerFormat::MONO, 16, BayerFormat::Packing::None },
 		{ formats::R16, V4L2PixelFormat(V4L2_PIX_FMT_Y16) } },
 	{ { BayerFormat::MONO, 16, BayerFormat::Packing::PISP1 },

src/libcamera/formats.cpp

@@ -527,6 +527,16 @@ const std::map<PixelFormat, PixelFormatInfo> pixelFormatInfo{
 		.pixelsPerGroup = 4,
 		.planes = {{ { 5, 1 }, { 0, 0 }, { 0, 0 } }},
 	} },
+	{ formats::R12_CSI2P, {
+		.name = "R12_CSI2P",
+		.format = formats::R12_CSI2P,
+		.v4l2Formats = { V4L2PixelFormat(V4L2_PIX_FMT_Y12P), },
+		.bitsPerPixel = 12,
+		.colourEncoding = PixelFormatInfo::ColourEncodingYUV,
+		.packed = true,
+		.pixelsPerGroup = 2,
+		.planes = {{ { 3, 1 }, { 0, 0 }, { 0, 0 } }},
+	} },
 	{ formats::R12, {
 		.name = "R12",
 		.format = formats::R12,

src/libcamera/formats.yaml

@@ -138,6 +138,9 @@ formats:
   - R10_CSI2P:
       fourcc: DRM_FORMAT_R10
       mod: MIPI_FORMAT_MOD_CSI2_PACKED
+  - R12_CSI2P:
+      fourcc: DRM_FORMAT_R12
+      mod: MIPI_FORMAT_MOD_CSI2_PACKED
 
   - SRGGB10_CSI2P:
       fourcc: DRM_FORMAT_SRGGB10

src/libcamera/v4l2_pixelformat.cpp

@@ -139,6 +139,8 @@ const std::map<V4L2PixelFormat, V4L2PixelFormat::Info> vpf2pf{
 		{ formats::R10_CSI2P, "10-bit Greyscale Packed" } },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_Y12),
 		{ formats::R12, "12-bit Greyscale" } },
+	{ V4L2PixelFormat(V4L2_PIX_FMT_Y12P),
+		{ formats::R12_CSI2P, "12-bit Greyscale Packed" } },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_Y16),
 		{ formats::R16, "16-bit Greyscale" } },