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DP550 component

This section describes the DP550 component.

DP550 - about

This component is a model of the DP550 Display Processor. Connect it to a visualization component to view LCD output. This is the single display configuration of DP550. For the dual display configuration, use DP550x2.

It is a C++ component with a LISA wrapper.

It passes tests as part of a booting Android kernel and running under the control of the official DP550 drivers.

Functions

  • All RGB and YUV format parsing.
  • Color adjustment in Display Engine (DE).
  • Nearest neighbor scaling.
  • All layers.
  • Alpha blending.
  • Memory writeback.
  • Inverse gamma adjustment.
  • Basic layer (overlay) and register security semantics.

Limitations

  • No support for polyphase scaling algorithm. Falls back to nearest neighbor when configured to do so.
  • No support for 3D or interlaced video.
  • No support for image enhancing functionality.
  • No colorspace conversion support.
  • No support for two plane YUV memory writeback.

DP550 - ports

This section describes the ports.

Table 4-64 DP550 ports

Name Protocol Type Description
clk_in ClockSignal Slave Master clock input, typically 24MHz, to drive pixel clock timing.
display LCD Master Connection to visualization component.
intr Signal Master Interrupt signaling from display engine.
intr_se Signal Master Interrupt signaling from scaling engine.
pvbus_m PVBus Master DMA port for video data.
pvbus_s PVBus Slave Slave port for connection for APB access.
reset_signal Signal Slave Slave port for external reset line.

DP550 - parameters

This section describes the parameters.

Table 4-65 DP550 parameters

Name Type Allowed values Default value Description
disable_snooping_dma bool true, false false Disable DMA snooping.
dual_mode bool true, false false Whether 2 display mode is supported.
force_frame_rate int 0-60 0 If 0, the input clock is used as PXLCLOCK, if >0, the model ensures the screen display is refreshed n times per simulated second.
set_nprot_nsaid int - 0x201374360 Configurable NPROT_NSAID for non-secure NSAID values.
set_nprot_streamid int - 0x201374360 Configurable NPROT_STREAMID for non-secure STREAMID values.
set_prot_nsaid int - 0x67121680 Configurable PROT_NSAID for secure NSAID values.
set_prot_streamid int - 0x67121680 Configurable PROT_STREAMID for secure STREAMID values.

DP550 - registers

This component provides the registers that the Technical Reference Manual (TRM) specifies.

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