This driver is written for Texas Instruments's DM644X VPBE IP.
This SoC supports 2 video planes and 2 OSD planes as part of its
OSD (On Screen Display) block.
At present, the patches conatin the basic support of DM644X V4L2
driver, and subsequent patch sets would add support for external
encoders,other DMXXX family SoC and fbdev support.
VPBE V4L2 driver design
======================================================================
File partitioning
-----------------
V4L2 display device driver
drivers/media/video/davinci/vpbe_display.c
drivers/media/video/davinci/vpbe_display.h
VPBE display controller
drivers/media/video/davinci/vpbe.c
drivers/media/video/davinci/vpbe.h
VPBE venc sub device driver
drivers/media/video/davinci/vpbe_venc.c
drivers/media/video/davinci/vpbe_venc.h
drivers/media/video/davinci/vpbe_venc_regs.h
VPBE osd driver
drivers/media/video/davinci/vpbe_osd.c
drivers/media/video/davinci/vpbe_osd.h
drivers/media/video/davinci/vpbe_osd_regs.h
Functional partitioning
-----------------------
Consists of following (in the same order as the list under file
partitioning):-
1. V4L2 display driver
Implements 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 sub device
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 connetected 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 allowes
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 ans setting of the external
encoders is not present, and would be a part of the next patch series.
3. Venc sub device
Responsible for setting outputs provides 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 cab be maintained in the board specific setup file to support
various LCD displays.
4. osd sub device
Osd sub device implements all osd layer management and hardware specific
features. In the legacy drivers (LSPxxx), the hardware specific features
are configured through proprietary IOCTLs at the fb device interface. Since
sub devices are going to support device nodes, application will be able
to configure the hardware feayture directly by opening the osd sub device
node and by calling the related IOCTL. So these proprietary IOCTLs are
to be removed from the FB Device driver when doing up port of these drivers
to
mainline kernel. The V4L2 and FB device nodes supports only IOCTLS as per
the associated spec. The rest of the IOCTLs are to be moved to osd and
venc sub devices.
Current status:-
A build tested version of vpbe controller is available.
Following are TBDs.
vpbe display controller
- review and modify the handling of 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.
v4l2 driver
- A version is already developed which is to be cleaned up and unit tested
FB drivers
- Add support for fbdev drivers.- Ready and part of subsequent patches.
Manjunath Hadli (6):
davinci vpbe: V4L2 display driver for DM644X SoC
davinci vpbe: VPBE display driver
davinci vpbe: OSD(On Screen Display) block
davinci vpbe: VENC( Video Encoder) implementation
davinci vpbe: platform specific additions
davinci vpbe: Build infrastructure for VPBE driver
arch/arm/mach-davinci/board-dm644x-evm.c | 81 +-
arch/arm/mach-davinci/dm644x.c | 238 +++-
arch/arm/mach-davinci/include/mach/dm644x.h | 4 +
drivers/media/video/davinci/Kconfig | 22 +
drivers/media/video/davinci/Makefile | 2 +
drivers/media/video/davinci/vpbe.c | 853 ++++++++++
drivers/media/video/davinci/vpbe_display.c | 2282 ++++++++++++++++++++++++++
drivers/media/video/davinci/vpbe_osd.c | 1208 ++++++++++++++
drivers/media/video/davinci/vpbe_osd_regs.h | 389 +++++
drivers/media/video/davinci/vpbe_venc.c | 575 +++++++
drivers/media/video/davinci/vpbe_venc_regs.h | 189 +++
include/media/davinci/vpbe.h | 187 +++
include/media/davinci/vpbe_display.h | 144 ++
include/media/davinci/vpbe_osd.h | 397 +++++
include/media/davinci/vpbe_types.h | 93 ++
include/media/davinci/vpbe_venc.h | 41 +
16 files changed, 6686 insertions(+), 19 deletions(-)
create mode 100644 drivers/media/video/davinci/vpbe.c
create mode 100644 drivers/media/video/davinci/vpbe_display.c
create mode 100644 drivers/media/video/davinci/vpbe_osd.c
create mode 100644 drivers/media/video/davinci/vpbe_osd_regs.h
create mode 100644 drivers/media/video/davinci/vpbe_venc.c
create mode 100644 drivers/media/video/davinci/vpbe_venc_regs.h
create mode 100644 include/media/davinci/vpbe.h
create mode 100644 include/media/davinci/vpbe_display.h
create mode 100644 include/media/davinci/vpbe_osd.h
create mode 100644 include/media/davinci/vpbe_types.h
create mode 100644 include/media/davinci/vpbe_venc.h
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