Mechanism to detect idle screen on

摘要

In an embodiment, a display pipe is configured to composite one or more frames of images and/or video sequences to generate output frames for display. Additionally, the display pipe may be configured to compress an output frame and write the compressed frame to memory responsive to detecting static content in the output frames. The display pipe may also be configured to read the compressed frame from memory for display instead of reading the frames for compositing and display. In some embodiments, the display pipe may include an idle screen detect circuit configured to monitor the operation of the display pipe and/or the output frames to detect the static content.

主权项

1. A display control unit comprising:
a frame generation unit configured to generate frames for display, wherein data describing the frames is stored in one or more source buffers in memory, and wherein the frame generation unit includes a plurality of configuration registers that describe the source buffers, wherein the plurality of configuration registers includes a first register storing an address of a first source buffer of the one or more source buffers, and wherein the plurality of configuration registers include one or more second registers storing parameters that are in addition to the address and that correspond to the first source buffer of the one or more source buffers, wherein the parameters describe aspects of the first source buffer other than the address; and a control circuit coupled to the frame generation unit, wherein the control circuit is configured to detect that a plurality of successive frames generated by the frame generation unit have a static content and further configured to generate an output indicating idle screen detection responsive to detecting the plurality of successive frames, wherein the control circuit is configured to detect that successive frames have the static content responsive to the plurality of configuration registers corresponding to the source buffers, including the one or more second registers storing the parameters, having the same values between the successive frames.