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-
-                VPBE V4L2 driver design
- ======================================================================
-
- File partitioning
- -----------------
- V4L2 display device driver
-         drivers/media/platform/davinci/vpbe_display.c
-         drivers/media/platform/davinci/vpbe_display.h
-
- VPBE display controller
-         drivers/media/platform/davinci/vpbe.c
-         drivers/media/platform/davinci/vpbe.h
-
- VPBE venc sub device driver
-         drivers/media/platform/davinci/vpbe_venc.c
-         drivers/media/platform/davinci/vpbe_venc.h
-         drivers/media/platform/davinci/vpbe_venc_regs.h
-
- VPBE osd driver
-         drivers/media/platform/davinci/vpbe_osd.c
-         drivers/media/platform/davinci/vpbe_osd.h
-         drivers/media/platform/davinci/vpbe_osd_regs.h
-
- Functional partitioning
- -----------------------
-
- Consists of the following (in the same order as the list under file
- partitioning):-
-
- 1. V4L2 display driver
-    Implements creation of video2 and video3 device nodes and
-    provides v4l2 device interface to manage VID0 and VID1 layers.
-
- 2. Display controller
-    Loads up VENC, OSD and external encoders such as ths8200. It provides
-    a set of API calls to V4L2 drivers to set the output/standards
-    in the VENC or external sub devices. It also provides
-    a device object to access the services from OSD subdevice
-    using sub device ops. The connection of external encoders to VENC LCD
-    controller port is done at init time based on default output and standard
-    selection or at run time when application change the output through
-    V4L2 IOCTLs.
-
-    When connected to an external encoder, vpbe controller is also responsible
-    for setting up the interface between VENC and external encoders based on
-    board specific settings (specified in board-xxx-evm.c). This allows
-    interfacing external encoders such as ths8200. The setup_if_config()
-    is implemented for this as well as configure_venc() (part of the next patch)
-    API to set timings in VENC for a specific display resolution. As of this
-    patch series, the interconnection and enabling and setting of the external
-    encoders is not present, and would be a part of the next patch series.
-
- 3. VENC subdevice module
-    Responsible for setting outputs provided through internal DACs and also
-    setting timings at LCD controller port when external encoders are connected
-    at the port or LCD panel timings required. When external encoder/LCD panel
-    is connected, the timings for a specific standard/preset is retrieved from
-    the board specific table and the values are used to set the timings in
-    venc using non-standard timing mode.
-
-    Support LCD Panel displays using the VENC. For example to support a Logic
-    PD display, it requires setting up the LCD controller port with a set of
-    timings for the resolution supported and setting the dot clock. So we could
-    add the available outputs as a board specific entry (i.e add the "LogicPD"
-    output name to board-xxx-evm.c). A table of timings for various LCDs
-    supported can be maintained in the board specific setup file to support
-    various LCD displays.As of this patch a basic driver is present, and this
-    support for external encoders and displays forms a part of the next
-    patch series.
-
- 4. OSD module
-    OSD module implements all OSD layer management and hardware specific
-    features. The VPBE module interacts with the OSD for enabling and
-    disabling appropriate features of the OSD.
-
- Current status:-
-
- A fully functional working version of the V4L2 driver is available. This
- driver has been tested with NTSC and PAL standards and buffer streaming.
-
- Following are TBDs.
-
- vpbe display controller
-    - Add support for external encoders.
-    - add support for selecting external encoder as default at probe time.
-
- vpbe venc sub device
-    - add timings for supporting ths8200
-    - add support for LogicPD LCD.
-
- FB drivers
-    - Add support for fbdev drivers.- Ready and part of subsequent patches.