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media: doc: media/v4l-drivers: Qualcomm Camera Subsystem - PIX Interface

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Update Qualcomm Camera Subsystem driver document for the PIX interface
and format conversion support.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Todor Tomov 2017-08-08 09:30:10 -04:00 committed by Mauro Carvalho Chehab
parent 9b5833f7b8
commit d226efcfd0
1 changed files with 36 additions and 10 deletions
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46
Documentation/media/v4l-drivers/qcom_camss.rst
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@ -45,12 +45,36 @@ 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;
- raw dump of the input data to memory. RDI interface of VFE is supported.
PIX interface (ISP processing, statistics engines, resize/crop, format
conversion) is not supported in the current version;
- concurrent and independent usage of two data inputs - could be camera sensors
- 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).
- Concurrent and independent usage of two data inputs - could be camera sensors
and/or TG.
@ -65,15 +89,15 @@ interface, the driver is split into V4L2 sub-devices as follows:
- 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 equal
to the number of CSID sub-devices;
- 3 VFE sub-devices - VFE is represented by a number of sub-devices equal to
the number of RDI input interfaces.
- 4 VFE sub-devices - VFE is represented by a number of sub-devices equal to
the 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 module
allows to model the hardware links between these modules;
- representing VFE by a separate sub-devices for each RDI input interface allows
to use the three RDI interfaces concurently and independently as this is
- representing VFE by a separate sub-devices for each input interface allows
to use the input interfaces concurently and independently as this is
supported by the hardware;
- representing ISPIF by a number of sub-devices equal to the number of CSID
sub-devices allows to create linear media controller pipelines when using two
@ -99,6 +123,8 @@ nodes) is as follows:
- msm_vfe0_video1
- msm_vfe0_rdi2
- msm_vfe0_video2
- msm_vfe0_pix
- msm_vfe0_video3
Implementation