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1 | The VPBE V4L2 driver design |
2 | =========================== | |
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4 | File partitioning |
5 | ----------------- | |
af60313d | 6 | |
af60313d | 7 | V4L2 display device driver |
83c73537 LP |
8 | drivers/media/platform/davinci/vpbe_display.c |
9 | drivers/media/platform/davinci/vpbe_display.h | |
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10 | |
11 | VPBE display controller | |
83c73537 LP |
12 | drivers/media/platform/davinci/vpbe.c |
13 | drivers/media/platform/davinci/vpbe.h | |
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14 | |
15 | VPBE venc sub device driver | |
83c73537 LP |
16 | drivers/media/platform/davinci/vpbe_venc.c |
17 | drivers/media/platform/davinci/vpbe_venc.h | |
18 | drivers/media/platform/davinci/vpbe_venc_regs.h | |
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19 | |
20 | VPBE osd driver | |
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21 | drivers/media/platform/davinci/vpbe_osd.c |
22 | drivers/media/platform/davinci/vpbe_osd.h | |
23 | drivers/media/platform/davinci/vpbe_osd_regs.h | |
af60313d | 24 | |
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25 | Functional partitioning |
26 | ----------------------- | |
af60313d | 27 | |
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28 | Consists of the following (in the same order as the list under file |
29 | partitioning): | |
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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 | ||
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77 | Current status |
78 | -------------- | |
af60313d | 79 | |
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80 | A fully functional working version of the V4L2 driver is available. This |
81 | driver has been tested with NTSC and PAL standards and buffer streaming. | |
af60313d | 82 | |
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83 | To be done |
84 | ---------- | |
af60313d | 85 | |
e0f10453 | 86 | vpbe display controller |
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87 | - Add support for external encoders. |
88 | - add support for selecting external encoder as default at probe time. | |
89 | ||
e0f10453 | 90 | vpbe venc sub device |
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91 | - add timings for supporting ths8200 |
92 | - add support for LogicPD LCD. | |
93 | ||
e0f10453 | 94 | FB drivers |
af60313d | 95 | - Add support for fbdev drivers.- Ready and part of subsequent patches. |