Root/
1 | |
2 | VPBE V4L2 driver design |
3 | ====================================================================== |
4 | |
5 | File partitioning |
6 | ----------------- |
7 | V4L2 display device driver |
8 | drivers/media/video/davinci/vpbe_display.c |
9 | drivers/media/video/davinci/vpbe_display.h |
10 | |
11 | VPBE display controller |
12 | drivers/media/video/davinci/vpbe.c |
13 | drivers/media/video/davinci/vpbe.h |
14 | |
15 | VPBE venc sub device driver |
16 | drivers/media/video/davinci/vpbe_venc.c |
17 | drivers/media/video/davinci/vpbe_venc.h |
18 | drivers/media/video/davinci/vpbe_venc_regs.h |
19 | |
20 | VPBE osd driver |
21 | drivers/media/video/davinci/vpbe_osd.c |
22 | drivers/media/video/davinci/vpbe_osd.h |
23 | drivers/media/video/davinci/vpbe_osd_regs.h |
24 | |
25 | Functional partitioning |
26 | ----------------------- |
27 | |
28 | Consists of the following (in the same order as the list under file |
29 | partitioning):- |
30 | |
31 | 1. V4L2 display driver |
32 | Implements creation of video2 and video3 device nodes and |
33 | provides v4l2 device interface to manage VID0 and VID1 layers. |
34 | |
35 | 2. Display controller |
36 | Loads up VENC, OSD and external encoders such as ths8200. It provides |
37 | a set of API calls to V4L2 drivers to set the output/standards |
38 | in the VENC or external sub devices. It also provides |
39 | a device object to access the services from OSD subdevice |
40 | using sub device ops. The connection of external encoders to VENC LCD |
41 | controller port is done at init time based on default output and standard |
42 | selection or at run time when application change the output through |
43 | V4L2 IOCTLs. |
44 | |
45 | When connected to an external encoder, vpbe controller is also responsible |
46 | for setting up the interface between VENC and external encoders based on |
47 | board specific settings (specified in board-xxx-evm.c). This allows |
48 | interfacing external encoders such as ths8200. The setup_if_config() |
49 | is implemented for this as well as configure_venc() (part of the next patch) |
50 | API to set timings in VENC for a specific display resolution. As of this |
51 | patch series, the interconnection and enabling and setting of the external |
52 | encoders is not present, and would be a part of the next patch series. |
53 | |
54 | 3. VENC subdevice module |
55 | Responsible for setting outputs provided through internal DACs and also |
56 | setting timings at LCD controller port when external encoders are connected |
57 | at the port or LCD panel timings required. When external encoder/LCD panel |
58 | is connected, the timings for a specific standard/preset is retrieved from |
59 | the board specific table and the values are used to set the timings in |
60 | venc using non-standard timing mode. |
61 | |
62 | Support LCD Panel displays using the VENC. For example to support a Logic |
63 | PD display, it requires setting up the LCD controller port with a set of |
64 | timings for the resolution supported and setting the dot clock. So we could |
65 | add the available outputs as a board specific entry (i.e add the "LogicPD" |
66 | output name to board-xxx-evm.c). A table of timings for various LCDs |
67 | supported can be maintained in the board specific setup file to support |
68 | various LCD displays.As of this patch a basic driver is present, and this |
69 | support for external encoders and displays forms a part of the next |
70 | patch series. |
71 | |
72 | 4. OSD module |
73 | OSD module implements all OSD layer management and hardware specific |
74 | features. The VPBE module interacts with the OSD for enabling and |
75 | disabling appropriate features of the OSD. |
76 | |
77 | Current status:- |
78 | |
79 | A fully functional working version of the V4L2 driver is available. This |
80 | driver has been tested with NTSC and PAL standards and buffer streaming. |
81 | |
82 | Following are TBDs. |
83 | |
84 | vpbe display controller |
85 | - Add support for external encoders. |
86 | - add support for selecting external encoder as default at probe time. |
87 | |
88 | vpbe venc sub device |
89 | - add timings for supporting ths8200 |
90 | - add support for LogicPD LCD. |
91 | |
92 | FB drivers |
93 | - Add support for fbdev drivers.- Ready and part of subsequent patches. |
94 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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