diff options
Diffstat (limited to 'Documentation/admin-guide/media/davinci-vpbe.rst')
| -rw-r--r-- | Documentation/admin-guide/media/davinci-vpbe.rst | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/Documentation/admin-guide/media/davinci-vpbe.rst b/Documentation/admin-guide/media/davinci-vpbe.rst deleted file mode 100644 index 9e6360fd02db..000000000000 --- a/Documentation/admin-guide/media/davinci-vpbe.rst +++ /dev/null @@ -1,65 +0,0 @@ -.. SPDX-License-Identifier: GPL-2.0 - -The VPBE V4L2 driver design -=========================== - -Functional partitioning ------------------------ - -Consists of the following: - - 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. |