Commit eeee6973 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

media: davinci: remove vpbe support 



The davinci dm3xx/dm644x platforms are gone now, and the remaining
da8xx platforms do not use the vpbe driver, so the driver can be
removed as well.

Acked-by: default avatarLad Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 582603a9

Documentation/admin-guide/media/davinci-vpbe.rst

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.. 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.

Documentation/admin-guide/media/platform-cardlist.rst

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@@ -73,7 +73,6 @@ via-camera VIAFB camera controller 
video-mux          Video Multiplexer

vpif_display       TI DaVinci VPIF V4L2-Display

vpif_capture       TI DaVinci VPIF video capture

vpss               TI DaVinci VPBE V4L2-Display

vsp1               Renesas VSP1 Video Processing Engine

xilinx-tpg         Xilinx Video Test Pattern Generator

xilinx-video       Xilinx Video IP (EXPERIMENTAL)

Documentation/admin-guide/media/v4l-drivers.rst

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@@ -13,7 +13,6 @@ Video4Linux (V4L) driver-specific documentation 
	cafe_ccic

	cpia2

	cx88

	davinci-vpbe

	fimc

	imx

	imx7

Documentation/driver-api/media/drivers/davinci-vpbe-devel.rst

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.. SPDX-License-Identifier: GPL-2.0



The VPBE V4L2 driver design

===========================



File partitioning

-----------------



 V4L2 display device driver

         drivers/media/platform/ti/davinci/vpbe_display.c

         drivers/media/platform/ti/davinci/vpbe_display.h



 VPBE display controller

         drivers/media/platform/ti/davinci/vpbe.c

         drivers/media/platform/ti/davinci/vpbe.h



 VPBE venc sub device driver

         drivers/media/platform/ti/davinci/vpbe_venc.c

         drivers/media/platform/ti/davinci/vpbe_venc.h

         drivers/media/platform/ti/davinci/vpbe_venc_regs.h



 VPBE osd driver

         drivers/media/platform/ti/davinci/vpbe_osd.c

         drivers/media/platform/ti/davinci/vpbe_osd.h

         drivers/media/platform/ti/davinci/vpbe_osd_regs.h



To be done

----------



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.

Documentation/driver-api/media/drivers/index.rst

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@@ -16,7 +16,6 @@ Video4Linux (V4L) drivers 
	cpia2_devel

	cx2341x-devel

	cx88-devel

	davinci-vpbe-devel

	fimc-devel

	pvrusb2

	pxa_camera