On Tue, 28 Feb 2006 rasmit.ranjan@xxxxxxxxx wrote: > Hi, > For pci based host controller when we do global suspend it is the PM > sub-system which takes care of the sequence of suspend i.e. PM traverses > the device tree and suspends the child devices first and subsequently > suspends the controller. > I have a pcmcia based host controller what i mean is i have a pcmcia > card which has a usb host controller. Now two things come to picture. > One is the client driver and other is the HCD. The client driver > receives a suspend event when i suspend the card by pccardctl suspend. > In this case ther is no mechanism provided to communicate to the HCD > about the suspned which has to handled by the user i.e. the client > driver and hcd. Now if i do global suspend, is it the PM sub-system > which takes care of the suspend sequence ? Yes. > Here what i mean is PM will > traverse the device tree, it suspends the child devices, then it > suspends the controller and finally sends the suspend event to the > client driver or only the suspend event is sent to the client driver > with out suspendung the controller. The PM subsystem sends suspend messages to every driver in the device tree. > In case of resume, when i resume the card by pccardctl resume ( > not global ), only the resume event of the client driver is getting > called thats all. So here again the user has to take care of resuming > the hcd. So for the global resume does PM sub-system take care of > sending the resume event to the client driver and as well as resuming > the controller ? Yes. Alan Stern
