Support per port grouping - Qualcomm Dragonwing Documentation

IQ-9075-EVKIQ-8275-EVK

4

Sensors per CSI

VC/DT

Multiplexing

RDI

Independent Ports

GMSL

Interface

Platform Scope:
This section is applicable for IQ-9075-EVK and IQ-8275-EVK.

01 · What Is It?

Per Port Grouping enables the connection of up to 4 GMSL sensors through a single deserializer to a shared CSI interface and IFE-Lite instance. Each sensor utilizes a unique Virtual Channel (VC) to transmit image streams. The hardware then routes these streams to individual RDI ports (4 available in IFE-Lite) via VC/DT mapping.

Sensor [0..3] → Deserializer → Shared CSI → IFE-Lite [RDI 0..3] → Virtual RDI → User Space

02 · How Does It Work?

As part of boot up, the camera software sends camera group information to the application through a vendor tag (org.codeaurora.qcamera3.AvailableISPGroupsInfoTag). The application then sends additional information for all the cameras it’s going to open in that use case via EnabledISPGroupsConfigTag.

Implementation Logic

Kernel Management: The kernel space manages different sensors connected to same CSI by mapping the virtual RDI with hardware ports of the same IFE-Lite using port sharing information.
Configuration: All RDI ports need to be configured before enabling streaming on any port.
Concurrency: As long as the group configuration isn’t changed, the application can start any camera mentioned in that group at any time and stop at any time.

03 · Hardware Topology

In both IQ-9075-EVK and IQ-8275-EVK architectures, each GMSL deserializer port supports multiplexing up to four cameras into a single CSI group.

Instance	IQ-9075-EVK Configuration	IQ-8275-EVK Configuration
Deserializer-0	4x 3F10 Bayer (Group-0)	4x 3F10 Bayer (Group-0)
Deserializer-1	❌ Disabled (Hardware Issue)	❌ Disabled (Hardware Issue)
Deserializer-2	4x 3F10 YUV (Group-1)	4x 3F10 YUV (Group-1)
Deserializer-3	4x 3F10 YUV (Group-2)	—

04 · Validation

IQ-9075-EVK
IQ-8275-EVK

Currently on IQ-9075-EVK, the following GMSL concurrency is supported using the gst-camera-per-port-example application, which runs cameras with the per port group feature.

GMSL camera concurrency	Supported resolution and FPS	Connection
Four 3F10 YUV GMSL cameras	1920x1536, 30 FPS	Connect 4 3F10 YUV GMSLs to Port-2
Four 3F10 YUV GMSL cameras	1920x1536, 30 FPS	Connect 4 3F10 YUV GMSLs to Port-3
Eight 3F10 YUV GMSL cameras	1920x1536, 30 FPS	Connect 4 3F10 YUV GMSLs to Port-2 Connect 4 3F10 YUV GMSLs to Port-3

The four YUV GMSL concurrency use case is supported on GMSL Port 2 and Port 3. Four bayer GMSL and eight YUV GMSL camera concurrency is not supported in this release.

To run an eight 3F10 YUV GMSL camera concurrency use case using the gst-camera-per-port-example:

Connect hardware

Connect four 3F10 YUV GMSLs to Port-2 and four 3F10 YUV GMSLs to Port-3.

Run application

Run the gst-camera-per-port-example application.

Application Launch

# gst-camera-per-port-example --custom

Enter camera IDs

Enter the camera ID’s you want to open (space separated): 0 1 2 3 4 5 6 7

Configure stream details

Enter the following details for all eight cameras:

Number of streams for camera 0: 1
Width for stream 1 of camera 0: 1920
Height for stream 1 of camera 0: 1536
Framerate for stream 1 of camera 0: 30
Number of streams for camera 1: 1
Width for stream 1 of camera 1: 1920
Height for stream 1 of camera 1: 1536
Framerate for stream 1 of camera 1: 30

Execute GST pipelines

Enter the GST camera pipeline command for all 8 cameras. Use different file names when saving the encoded file of each camera.

The GST command needs to be in a single line without any new line or ‘\’ characters.

Camera 0:

GStreamer Pipeline

qtiqmmfsrc name=camsrc0 camera=0 video_0::type=video ! video/x-raw,format=NV12,width=1920,height=1536,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! mp4mux ! queue ! filesink location=/opt/cam0_IOT_1536p_NV12.mp4

Camera 1:

GStreamer Pipeline

qtiqmmfsrc name=camsrc1 camera=1 video_0::type=video ! video/x-raw,format=NV12,width=1920,height=1536,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! mp4mux ! queue ! filesink location=/opt/cam1_IOT_1536p_NV12.mp4

Verify log output

Confirm pipelines are started successfully:

Terminal Output

Setting pipeline gst-camera-pipeline for camera 0 to PLAYING
Pipeline is PREROLLING ...
Setting pipeline gst-camera-pipeline for camera 1 to PLAYING
Pipeline is PREROLLING ...
Pipelines are started

To stop camera streaming, select (q). The following logs are shown while exiting the application:

Exit Logs

Quit pressed!!

gst-camera-pipeline for camera 0 Received End-of-Stream...
Setting pipeline to NULL
Pipeline state change was successful

gst-camera-pipeline for camera 1 Received End-of-Stream...
Setting pipeline to NULL
Pipeline state change was successful
g_main_loop_run ends

Currently on IQ-8275-EVK, the following GMSL concurrency is supported using the gst-camera-per-port-example application, which runs cameras with the per port group feature.

GMSL camera concurrency	Supported resolution and FPS	Connection
Four 3F10 Bayer GMSL cameras	1824x1536, 30 FPS	Connect 4 3F10 Bayer GMSLs to Port-0
Four 3F10 YUV GMSL cameras	1920x1536, 30 FPS	Connect 4 3F10 YUV GMSLs to Port-2
Four 3F10 bayer GMSL cameras + 4 YUV GMSL cameras	Bayer GMSLs:1824x1536, 30 FPS YUV GMSLs:1920x1536, 30fps	Connect 4 3F10 Bayer GMSLs to Port-0 Connect 4 3F10 YUV GMSLs to Port-2

Four bayer + four YUV GMSL camera concurrency is not supported in this release.

To run an eight GMSL camera concurrency use case (four 3F10 bayer GMSL cameras + four YUV GMSL cameras) using the gst-camera-per-port-example:

Connect hardware

Connect four 3F10 bayer GMSLs to Port-0 and four 3F10 YUV GMSLs to Port-2.

Run application

Run the gst-camera-per-port-example application.

Application Launch

# gst-camera-per-port-example --custom

Enter camera IDs

Enter the camera ID’s you want to open (space separated): 0 1 2 3 4 5 6 7

Configure stream details

Enter the following details for all eight cameras:

Number of streams for camera 0: 1
Width for stream 1 of camera 0: 1920
Height for stream 1 of camera 0: 1536
Framerate for stream 1 of camera 0: 30
Number of streams for camera 1: 1
Width for stream 1 of camera 1: 1920
Height for stream 1 of camera 1: 1536
Framerate for stream 1 of camera 1: 30

Execute GST pipelines

Enter the GST camera pipeline command for all 8 cameras. Use different file names when saving the encoded file of each camera.

The GST command needs to be in a single line without any new line or ‘\’ characters.

Camera 0:

GStreamer Pipeline

qtiqmmfsrc name=camsrc0 camera=0 video_0::type=video ! video/x-raw,format=NV12,width=1824,height=1536,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! mp4mux ! queue ! filesink location=/opt/cam0_IOT_1536p_NV12.mp4

Camera 1:

GStreamer Pipeline

qtiqmmfsrc name=camsrc1 camera=1 video_0::type=video ! video/x-raw,format=NV12,width=1824,height=1536,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! mp4mux ! queue ! filesink location=/opt/cam1_IOT_1536p_NV12.mp4

Verify log output

Confirm pipelines are started successfully:

Terminal Output

Setting pipeline gst-camera-pipeline for camera 0 to PLAYING
Pipeline is PREROLLING ...
Setting pipeline gst-camera-pipeline for camera 1 to PLAYING
Pipeline is PREROLLING ...
Pipelines are started

To stop camera streaming, select (q). The following logs are shown while exiting the application:

Exit Logs

Quit pressed!!

gst-camera-pipeline for camera 0 Received End-of-Stream...
Setting pipeline to NULL
Pipeline state change was successful

gst-camera-pipeline for camera 1 Received End-of-Stream...
Setting pipeline to NULL
Pipeline state change was successful
g_main_loop_run ends

🛠️ Troubleshooting / Known Issues

Issue / Observation	Affected Platform	Details / Notes
Deserializer-1 Disabled	IQ-9075-EVK & IQ-8275-EVK	Deserializer-1 is disabled on both platforms due to a hardware issue
Four Bayer GMSL concurrency not supported	IQ-9075-EVK	4x Bayer GMSL concurrent streaming is not supported in the current release
Eight YUV GMSL concurrency not supported	IQ-9075-EVK	8x YUV GMSL camera concurrency is not supported in the current release
Deserializer-3 not available	IQ-8275-EVK	Deserializer-3 (Group-2, 4x 3F10 YUV) exists on IQ-9075-EVK but is absent on IQ-8275-EVK

4

VC/DT

RDI

GMSL

​01 · What Is It?

​02 · How Does It Work?

​Implementation Logic

​03 · Hardware Topology

​04 · Validation

​🛠️ Troubleshooting / Known Issues

01 · What Is It?

02 · How Does It Work?

Implementation Logic

03 · Hardware Topology

04 · Validation

🛠️ Troubleshooting / Known Issues