[RK3399][Android7.1] Display中的Component System

最新推荐文章于 2025-06-11 19:54:58 发布

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最新推荐文章于 2025-06-11 19:54:58 发布 · 5.7k 阅读

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CC 4.0 BY-SA版权

文章标签：

#drm #component #crtc #encoder #connector

本文详细介绍了在Android 7.1和RK3399平台上，DRM组件系统的工作原理，包括CRTC、Encoder、Connector等组件如何在组件系统中管理。通过dts配置，组件被连接并通过driver进行初始化和绑定。在组件全部准备好后，master会被bring up，从而完成整个系统的初始化。

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OS: Android 7.1
Board: Firefly-RK3399
Kernel: v4.4.55

上一篇文章介绍了DRM的概念，有CRTC, Encoder, Connector等好多个模块，各个模块都作为一个组件添加到组件系统中，通过组件驱动来管理。

关于component system，下面是作者的一段话：

Subsystems such as ALSA, DRM and others require a single card-level
device structure to represent a subsystem.  However, firmware tends to
describe the individual devices and the connections between them.

Therefore, we need a way to gather up the individual component devices
together, and indicate when we have all the component devices.

We do this in DT by providing a "superdevice" node which specifies
the components, eg:

	imx-drm {
		compatible = "fsl,drm";
		crtcs = <&ipu1>;
		connectors = <&hdmi>;
	};

The superdevice is declared into the component support, along with the
subcomponents.  The superdevice receives callbacks to locate the
subcomponents, and identify when all components are pres