| Benjamin Gaignard | 30ebb908 | 2014-07-28 10:23:12 +0200 | [diff] [blame^] | 1 | 1. stiH display hardware IP |
| 2 | --------------------------- |
| 3 | The STMicroelectronics stiH SoCs use a common chain of HW display IP blocks: |
| 4 | - The High Quality Video Display Processor (HQVDP) gets video frames from a |
| 5 | video decoder and does high quality video processing, including scaling. |
| 6 | |
| 7 | - The Compositor is a multiplane, dual-mixer (Main & Aux) digital processor. It |
| 8 | has several inputs: |
| 9 | - The graphics planes are internally processed by the Generic Display |
| 10 | Pipeline (GDP). |
| 11 | - The video plug (VID) connects to the HQVDP output. |
| 12 | - The cursor handles ... a cursor. |
| 13 | - The TV OUT pre-formats (convert, clip, round) the compositor output data |
| 14 | - The HDMI / DVO / HD Analog / SD analog IP builds the video signals |
| 15 | - DVO (Digital Video Output) handles a 24bits parallel signal |
| 16 | - The HD analog signal is typically driven by a YCbCr cable, supporting up to |
| 17 | 1080i mode. |
| 18 | - The SD analog signal is typically used for legacy TV |
| 19 | - The VTG (Video Timing Generators) build Vsync signals used by the other HW IP |
| 20 | Note that some stiH drivers support only a subset of thee HW IP. |
| 21 | |
| 22 | .-------------. .-----------. .-----------. |
| 23 | GPU >-------------+GDP Main | | +---+ HDMI +--> HDMI |
| 24 | GPU >-------------+GDP mixer+---+ | :===========: |
| 25 | GPU >-------------+Cursor | | +---+ DVO +--> 24b// |
| 26 | ------- | COMPOSITOR | | TV OUT | :===========: |
| 27 | | | | | | +---+ HD analog +--> YCbCr |
| 28 | Vid >--+ HQVDP +--+VID Aux +---+ | :===========: |
| 29 | dec | | | mixer| | +---+ SD analog +--> CVBS |
| 30 | '-------' '-------------' '-----------' '-----------' |
| 31 | .-----------. |
| 32 | | main+--> Vsync |
| 33 | | VTG | |
| 34 | | aux+--> Vsync |
| 35 | '-----------' |
| 36 | |
| 37 | 2. DRM / HW mapping |
| 38 | ------------------- |
| 39 | These IP are mapped to the DRM objects as following: |
| 40 | - The CRTCs are mapped to the Compositor Main and Aux Mixers |
| 41 | - The Framebuffers and planes are mapped to the Compositor GDP (non video |
| 42 | buffers) and to HQVDP+VID (video buffers) |
| 43 | - The Cursor is mapped to the Compositor Cursor |
| 44 | - The Encoders are mapped to the TVOut |
| 45 | - The Bridges/Connectors are mapped to the HDMI / DVO / HD Analog / SD analog |
| 46 | |
| 47 | FB & planes Cursor CRTC Encoders Bridges/Connectors |
| 48 | | | | | | |
| 49 | | | | | | |
| 50 | | .-------------. | .-----------. .-----------. | |
| 51 | +------------> |GDP | Main | | | +-> | | HDMI | <-+ |
| 52 | +------------> |GDP v mixer|<+ | | | :===========: | |
| 53 | | |Cursor | | | +-> | | DVO | <-+ |
| 54 | | ------- | COMPOSITOR | | |TV OUT | | :===========: | |
| 55 | | | | | | | | +-> | | HD analog | <-+ |
| 56 | +-> | HQVDP | |VID Aux |<+ | | | :===========: | |
| 57 | | | | mixer| | +-> | | SD analog | <-+ |
| 58 | '-------' '-------------' '-----------' '-----------' |