Linux下动态切换EHCI控制器下端口的速率(即切换为12M)

在sys目录下找到对应的控制器

例如:/sys/devices/platform/soc/ehci,直接操作该目录下的companion

echo 1  > companion  将port1设置为companion控制器所有,即降速

echo -1 > companion

/*
* Dedicate or undedicate a port to the companion controller.
* Syntax is "[-]portnum", where a leading ‘-‘ sign means
* return control of the port to the EHCI controller.
*/

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