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media: doc: media/v4l-drivers: Qualcomm Camera Subsystem - Scale and crop 

Update the Qualcomm Camera Subsystem driver document for VFE scale
and crop modules 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 09:30:16 -04:00 committed by Mauro Carvalho Chehab
parent 4cd0e35425
commit 474a53d645
1 changed files with 13 additions and 1 deletions
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14
Documentation/media/v4l-drivers/qcom_camss.rst
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@ -35,7 +35,8 @@ driver consists of:
the CSIDs to the inputs of the VFE;
- VFE (Video Front End) module. Contains a pipeline of image processing hardware
blocks. The VFE has different input interfaces. The PIX input interface feeds
the input data to the image processing pipeline. Three RDI input interfaces
the input data to the image processing pipeline. The image processing pipeline
contains also a scale and crop module at the end. Three RDI input interfaces
bypass the image processing pipeline. The VFE also contains the AXI bus
interface which writes the output data to memory.
@ -74,6 +75,11 @@ The current version of the driver supports:
- 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 module
for 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 sensors
and/or TG.
@ -135,6 +141,12 @@ not required to implement the currently supported functionality. The complete
configuration on each hardware module is applied on STREAMON ioctl based on
the current active media links, formats and controls set.
The output size of the scaler module in the VFE is configured with the actual
compose 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 actual
crop selection rectangle on the source pad of the 'msm_vfe0_pix' entity.
Documentation
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