高通msm8952平台如何修改SDP的充电电流

支持usb3.0的电脑，SDP的最大充电电流如何修改。

具体路径kernel/drivers/usb/gadget/Composite.c里面的函数



You can check if the computer PC have SS flag or not to see if it support to USB 3.0--900mA. static int set_config(struct usb_composite_dev cdev, const struct usb_ctrlrequest ctrl, unsigned number) { ...... /* when we return, be sure our power usage is valid */ power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW; done: usb_gadget_vbus_draw(gadget, power); if (result >= 0 && cdev->delayed_status) result = USB_GADGET_DELAYED_STATUS; return result; } you can change power to 900ma. but the actual current need host SDP support.

 You can check if the computer PC have SS flag or not to see if it support to USB 3.0--900mA. 
 
 static int set_config(struct usb_composite_dev *cdev, 
 const struct usb_ctrlrequest *ctrl, unsigned number) 
 { 
 
 ...... 
 
 /* when we return, be sure our power usage is valid */ 
 power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW; 
 done: 
 usb_gadget_vbus_draw(gadget, power); 
 if (result >= 0 && cdev->delayed_status) 
 result = USB_GADGET_DELAYED_STATUS; 
 return result; 
 } 
 
 you can change power to 900ma. 
 
 but the actual current need host SDP support. 

除了上面的修改，充电模块会限制到这个电流，同时需要在相应的dtsi里面修改qcom.thermal-mitigations = <1500 700 600 0>改为<1500 900 600 0>

原文链接：https://blog.csdn.net/u012296694/article/details/48828907