“HDMI-CEC”, short for HDMI Consumer Electronics Control, is an HDMI feature many TVs and peripherals have. This feature makes your devices work better together, but is often disabled by default. To make things even more confusing, manufacturers often don’t call this feature “HDMI-CEC”.
- Recommended Webcam & Camera Drivers Updates A Webcam Driver is a program which allows communication between your webcam (in-built or external camera on your computer) and your PC. Webcam drivers should be updated in order to keep the devices running well.
- Drivers and Modules. For your webcam to work you will need support for the connection and support for the actual camera hardware. Those who are already versed in kernels and modules and how to load them should skip to Section 2.2, which addresses support of the connection type.
- This update addresses CEC Operation, HDMI 1.4 improvements, a Lens-shift direction of the ceiling mode, smoothness of the Color management adjustment, and improve the 2D to 3D (and 3D to 2D) mode switching View the DLA-X7 & DLA-X9 update procedure Download the DLA-X7 & DLA-X9 update file (zip format) DLA-HD350BU firmware update.
- Webcam Drivers If the operating system does not detect the camera, you must first make sure that the camera drivers are installed. In addition, do not forget that manufacturers of webcams strongly recommend installing the latest drivers.
24.1. Introduction¶
This file documents the Qualcomm Camera Subsystem driver located underdrivers/media/platform/qcom/camss-8x16.
The current version of the driver supports the Camera Subsystem found onQualcomm MSM8916 and APQ8016 processors.
The driver implements V4L2, Media controller and V4L2 subdev interfaces.Camera sensor using V4L2 subdev interface in the kernel is supported.
The driver is implemented using as a reference the Qualcomm Camera Subsystemdriver for Android as found in Code Aurora [1].
24.2. Qualcomm Camera Subsystem hardware¶
The Camera Subsystem hardware found on 8x16 processors and supported by thedriver consists of:
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- 2 CSIPHY modules. They handle the Physical layer of the CSI2 receivers.A separate camera sensor can be connected to each of the CSIPHY module;
- 2 CSID (CSI Decoder) modules. They handle the Protocol and Application layerof the CSI2 receivers. A CSID can decode data stream from any of the CSIPHY.Each CSID also contains a TG (Test Generator) block which can generateartificial input data for test purposes;
- ISPIF (ISP Interface) module. Handles the routing of the data streams fromthe CSIDs to the inputs of the VFE;
- VFE (Video Front End) module. Contains a pipeline of image processing hardwareblocks. The VFE has different input interfaces. The PIX (Pixel) inputinterface feeds the input data to the image processing pipeline. The imageprocessing pipeline contains also a scale and crop module at the end. ThreeRDI (Raw Dump Interface) input interfaces bypass the image processingpipeline. The VFE also contains the AXI bus interface which writes the outputdata to memory.
24.3. Supported functionality¶
The current version of the driver supports:
Input from camera sensor via CSIPHY;
Generation of test input data by the TG in CSID;
RDI interface of VFE - raw dump of the input data to memory.
Supported formats:
- YUYV/UYVY/YVYU/VYUY (packed YUV 4:2:2 - V4L2_PIX_FMT_YUYV /V4L2_PIX_FMT_UYVY / V4L2_PIX_FMT_YVYU / V4L2_PIX_FMT_VYUY);
- MIPI RAW8 (8bit Bayer RAW - V4L2_PIX_FMT_SRGGB8 /V4L2_PIX_FMT_SGRBG8 / V4L2_PIX_FMT_SGBRG8 / V4L2_PIX_FMT_SBGGR8);
- MIPI RAW10 (10bit packed Bayer RAW - V4L2_PIX_FMT_SBGGR10P /V4L2_PIX_FMT_SGBRG10P / V4L2_PIX_FMT_SGRBG10P / V4L2_PIX_FMT_SRGGB10P);
- MIPI RAW12 (12bit packed Bayer RAW - V4L2_PIX_FMT_SRGGB12P /V4L2_PIX_FMT_SGBRG12P / V4L2_PIX_FMT_SGRBG12P / V4L2_PIX_FMT_SRGGB12P).
PIX interface of VFE
Format conversion of the input data.
Supported input formats:
- YUYV/UYVY/YVYU/VYUY (packed YUV 4:2:2 - V4L2_PIX_FMT_YUYV /V4L2_PIX_FMT_UYVY / V4L2_PIX_FMT_YVYU / V4L2_PIX_FMT_VYUY).
Supported output formats:
- NV12/NV21 (two plane YUV 4:2:0 - V4L2_PIX_FMT_NV12 / V4L2_PIX_FMT_NV21);
- NV16/NV61 (two plane YUV 4:2:2 - V4L2_PIX_FMT_NV16 / V4L2_PIX_FMT_NV61).
Scaling support. Configuration of the VFE Encoder Scale modulefor downscalling with ratio up to 16x.
Cropping support. Configuration of the VFE Encoder Crop module.
Concurrent and independent usage of two data inputs - could be camera sensorsand/or TG.
24.4. Driver Architecture and Design¶
The driver implements the V4L2 subdev interface. With the goal to model thehardware links between the modules and to expose a clean, logical and usableinterface, the driver is split into V4L2 sub-devices as follows:
- 2 CSIPHY sub-devices - each CSIPHY is represented by a single sub-device;
- 2 CSID sub-devices - each CSID is represented by a single sub-device;
- 2 ISPIF sub-devices - ISPIF is represented by a number of sub-devices equalto the number of CSID sub-devices;
- 4 VFE sub-devices - VFE is represented by a number of sub-devices equal tothe number of the input interfaces (3 RDI and 1 PIX).
The considerations to split the driver in this particular way are as follows:
- representing CSIPHY and CSID modules by a separate sub-device for each moduleallows to model the hardware links between these modules;
- representing VFE by a separate sub-devices for each input interface allowsto use the input interfaces concurently and independently as this issupported by the hardware;
- representing ISPIF by a number of sub-devices equal to the number of CSIDsub-devices allows to create linear media controller pipelines when using twocameras simultaneously. This avoids branches in the pipelines which otherwisewill require a) userspace and b) media framework (e.g. power on/offoperations) to make assumptions about the data flow from a sink pad to asource pad on a single media entity.
Each VFE sub-device is linked to a separate video device node.
The media controller pipeline graph is as follows (with connected two OV5645camera sensors):
24.5. Implementation¶
Runtime configuration of the hardware (updating settings while streaming) isnot required to implement the currently supported functionality. The completeconfiguration on each hardware module is applied on STREAMON ioctl based onthe current active media links, formats and controls set.
The output size of the scaler module in the VFE is configured with the actualcompose selection rectangle on the sink pad of the ‘msm_vfe0_pix’ entity.
The crop output area of the crop module in the VFE is configured with the actualcrop selection rectangle on the source pad of the ‘msm_vfe0_pix’ entity.
24.6. Documentation¶
APQ8016 Specification:https://developer.qualcomm.com/download/sd410/snapdragon-410-processor-device-specification.pdfReferenced 2016-11-24.
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24.7. References¶
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| [1] | https://source.codeaurora.org/quic/la/kernel/msm-3.10/ |