59 lines
3.1 KiB
Plaintext
59 lines
3.1 KiB
Plaintext
1. stiH display hardware IP
|
|
---------------------------
|
|
The STMicroelectronics stiH SoCs use a common chain of HW display IP blocks:
|
|
- The High Quality Video Display Processor (HQVDP) gets video frames from a
|
|
video decoder and does high quality video processing, including scaling.
|
|
|
|
- The Compositor is a multiplane, dual-mixer (Main & Aux) digital processor. It
|
|
has several inputs:
|
|
- The graphics planes are internally processed by the Generic Display
|
|
Pipeline (GDP).
|
|
- The video plug (VID) connects to the HQVDP output.
|
|
- The cursor handles ... a cursor.
|
|
- The TV OUT pre-formats (convert, clip, round) the compositor output data
|
|
- The HDMI / DVO / HD Analog / SD analog IP builds the video signals
|
|
- DVO (Digital Video Output) handles a 24bits parallel signal
|
|
- The HD analog signal is typically driven by a YCbCr cable, supporting up to
|
|
1080i mode.
|
|
- The SD analog signal is typically used for legacy TV
|
|
- The VTG (Video Timing Generators) build Vsync signals used by the other HW IP
|
|
Note that some stiH drivers support only a subset of thee HW IP.
|
|
|
|
.-------------. .-----------. .-----------.
|
|
GPU >-------------+GDP Main | | +---+ HDMI +--> HDMI
|
|
GPU >-------------+GDP mixer+---+ | :===========:
|
|
GPU >-------------+Cursor | | +---+ DVO +--> 24b//
|
|
------- | COMPOSITOR | | TV OUT | :===========:
|
|
| | | | | +---+ HD analog +--> YCbCr
|
|
Vid >--+ HQVDP +--+VID Aux +---+ | :===========:
|
|
dec | | | mixer| | +---+ SD analog +--> CVBS
|
|
'-------' '-------------' '-----------' '-----------'
|
|
.-----------.
|
|
| main+--> Vsync
|
|
| VTG |
|
|
| aux+--> Vsync
|
|
'-----------'
|
|
|
|
2. DRM / HW mapping
|
|
-------------------
|
|
These IP are mapped to the DRM objects as following:
|
|
- The CRTCs are mapped to the Compositor Main and Aux Mixers
|
|
- The Framebuffers and planes are mapped to the Compositor GDP (non video
|
|
buffers) and to HQVDP+VID (video buffers)
|
|
- The Cursor is mapped to the Compositor Cursor
|
|
- The Encoders are mapped to the TVOut
|
|
- The Bridges/Connectors are mapped to the HDMI / DVO / HD Analog / SD analog
|
|
|
|
FB & planes Cursor CRTC Encoders Bridges/Connectors
|
|
| | | | |
|
|
| | | | |
|
|
| .-------------. | .-----------. .-----------. |
|
|
+------------> |GDP | Main | | | +-> | | HDMI | <-+
|
|
+------------> |GDP v mixer|<+ | | | :===========: |
|
|
| |Cursor | | | +-> | | DVO | <-+
|
|
| ------- | COMPOSITOR | | |TV OUT | | :===========: |
|
|
| | | | | | | +-> | | HD analog | <-+
|
|
+-> | HQVDP | |VID Aux |<+ | | | :===========: |
|
|
| | | mixer| | +-> | | SD analog | <-+
|
|
'-------' '-------------' '-----------' '-----------'
|