Support for Y16 format (Jetpack 5.0.0 and newer)

[benm12y6]

I’m interested in adding Y16 (16 bit grayscale) support for cameras in newer versions of jetpack. I came across this thread, however I don’t think the newer kernel in jetpack 5.0+ has some of the files mentioned. This seems to be supported by these changes to the kernel:

https://patchwork.kernel.org/project/linux-media/patch/bf6d5d12-9460-2bcc-a0d7-5553e7e18065@xs4all.nl/#23452819

I was wondering if anyone could shed some light on how this might be accomplished for newer kernels?

[ShaneCCC]

The SOC camera doesn’t use any more current sensor driver is media framework.
Checking below document for sensor driver implement.

https://docs.nvidia.com/jetson/archives/r35.1/DeveloperGuide/text/SD/CameraDevelopment/SensorSoftwareDriverProgramming.html#

[benm12y6]

Thank you for getting back to me. This is a great resource, and I have done some reading into the media framework. I am not clear on how this answers my question though.

[ShaneCCC]

For Y16 format support you need add it to media framework driver like the topic you post.
The driver is located …/kernel/nvidia/drivers/media/platform/tegra/camera/*

[benm12y6]

Hi Shane,

I’m still a bit confused. The patch file in the thread I linked has this section:

index e3e665e..223edb2 100644
--- kernel/kernel-4.9/drivers/media/platform/soc_camera/soc_mediabus.c
+++ kernel/kernel-4.9/drivers/media/platform/soc_camera/soc_mediabus.c
@@ -172,6 +172,16 @@ static const struct soc_mbus_lookup mbus_fmt[] = {
 		.order			= SOC_MBUS_ORDER_LE,
 		.layout			= SOC_MBUS_LAYOUT_PACKED,
 	},
+}, {
+	.code = MEDIA_BUS_FMT_Y16_1X16,
+	.fmt = {
+		.fourcc			= V4L2_PIX_FMT_Y16,
+		.name			= "Grey 16bit",
+		.bits_per_sample	= 16,
+		.packing		= SOC_MBUS_PACKING_EXTEND16,
+		.order			= SOC_MBUS_ORDER_LE,
+		.layout			= SOC_MBUS_LAYOUT_PACKED,
+	},

The file in question doesn’t seem to exist in the newer kernel. What change would I need to make instead of this?

[ShaneCCC]

Have check the programing guide.

pixel_phase*	
Sensor pixel phase. Possible values are:

uyvy
vyuy
yuyv	yvyu
rggb
bggr	grbg
gbrg

https://docs.nvidia.com/jetson/archives/r35.1/DeveloperGuide/text/SD/CameraDevelopment/SensorSoftwareDriverProgramming.html?highlight=num_of_line#property-value-pairs