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| author | Bingbu Cao <bingbu.cao@intel.com> | 2020-04-17 12:34:33 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-05 14:10:59 +0300 |
| commit | 11de96b94f7c61956d07f58751b224ad2acc43b4 (patch) | |
| tree | da63b30b4def97c9f1e04e86571dd1b6183b53af /Documentation/admin-guide/media | |
| parent | 735a02f1bbc2c5e6e9cdbf0222948ff03ff7ab2d (diff) | |
| download | linux-11de96b94f7c61956d07f58751b224ad2acc43b4.tar.xz | |
media: ipu3.rst: add explanation for running mode
Add some explanation of the ImgU running mode and add more information
about firmware selection and running mode usage.
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/media')
| -rw-r--r-- | Documentation/admin-guide/media/ipu3.rst | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/Documentation/admin-guide/media/ipu3.rst b/Documentation/admin-guide/media/ipu3.rst index 11e2ac4888f5..7a257c358f9d 100644 --- a/Documentation/admin-guide/media/ipu3.rst +++ b/Documentation/admin-guide/media/ipu3.rst @@ -231,12 +231,31 @@ Configuring the Intel IPU3 The IPU3 ImgU pipelines can be configured using the Media Controller, defined at :ref:`media_controller`. -Firmware binary selection +Running mode and firmware binary selection ------------------------- +ImgU works based on firmware, currently the ImgU firmware support run 2 pipes in +time-sharing with single input frame data. Each pipe can run at certain mode - +"VIDEO" or "STILL", "VIDEO" mode is commonly used for video frames capture, and +"STILL" is used for still frame capture. However, you can also select "VIDEO" to +capture still frames if you want to capture images with less system load and +power. For "STILL" mode, ImgU will try to use smaller BDS factor and output +larger bayer frame for further YUV processing than "VIDEO" mode to get high +quality images. Besides, "STILL" mode need XNR3 to do noise reduction, hence +"STILL" mode will need more power and memory bandwidth than "VIDEO" mode. TNR +will be enabled in "VIDEO" mode and bypassed by "STILL" mode. ImgU is running at +“VIDEO” mode by default, the user can use v4l2 control V4L2_CID_INTEL_IPU3_MODE +(currently defined in drivers/staging/media/ipu3/include/intel-ipu3.h) to query +and set the running mode. For user, there is no difference for buffer queueing +between the "VIDEO" and "STILL" mode, mandatory input and main output node +should be enabled and buffers need be queued, the statistics and the view-finder +queues are optional. + +The firmware binary will be selected according to current running mode, such log +"using binary if_to_osys_striped " or "using binary if_to_osys_primary_striped" +could be observed if you enable the ImgU dynamic debug, the binary +if_to_osys_striped is selected for "VIDEO" and the binary +"if_to_osys_primary_striped" is selected for "STILL". -The firmware binary is selected using the V4L2_CID_INTEL_IPU3_MODE, currently -defined in drivers/staging/media/ipu3/include/intel-ipu3.h . "VIDEO" and "STILL" -modes are available. Processing the image in raw Bayer format ---------------------------------------- |