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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>
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@ -35,7 +35,8 @@ driver consists of:
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the CSIDs to the inputs of the VFE;
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- VFE (Video Front End) module. Contains a pipeline of image processing hardware
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blocks. The VFE has different input interfaces. The PIX input interface feeds
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the input data to the image processing pipeline. Three RDI input interfaces
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the input data to the image processing pipeline. The image processing pipeline
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contains also a scale and crop module at the end. Three RDI input interfaces
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bypass the image processing pipeline. The VFE also contains the AXI bus
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interface which writes the output data to memory.
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@ -74,6 +75,11 @@ The current version of the driver supports:
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- NV12/NV21 (two plane YUV 4:2:0 - V4L2_PIX_FMT_NV12 / V4L2_PIX_FMT_NV21);
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- NV16/NV61 (two plane YUV 4:2:2 - V4L2_PIX_FMT_NV16 / V4L2_PIX_FMT_NV61).
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- Scaling support. Configuration of the VFE Encoder Scale module
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for downscalling with ratio up to 16x.
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- Cropping support. Configuration of the VFE Encoder Crop module.
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- Concurrent and independent usage of two data inputs - could be camera sensors
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and/or TG.
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@ -135,6 +141,12 @@ not required to implement the currently supported functionality. The complete
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configuration on each hardware module is applied on STREAMON ioctl based on
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the current active media links, formats and controls set.
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The output size of the scaler module in the VFE is configured with the actual
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compose selection rectangle on the sink pad of the 'msm_vfe0_pix' entity.
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The crop output area of the crop module in the VFE is configured with the actual
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crop selection rectangle on the source pad of the 'msm_vfe0_pix' entity.
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Documentation
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-------------
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