Re: How to perform runtime pm for usb hcds?
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On Nov 21, 2007 12:59 PM, jidong xiao <jidong.xiao@xxxxxxxxx> wrote: > On Nov 19, 2007 11:20 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > On Mon, 19 Nov 2007, jidong xiao wrote: > > > > > Hi, > > > I saw usb_hcd_pci_suspend() is stored in several HCD's struct > > > pci_driver as suspend, and usb_hcd_pci_resume() is stored as > > > resume().From user's perspective, is it possible to call these methods > > > manually?I mean,I am using kdb the trace these methods,and I wanna set > > > a breakpoint in the point whenever these two methods are invoked. > > > That's to say, once either of these two methods are invoked, then the > > > system will drop into kdb, so that I can do some analysis on these two > > > methods. But the problem is, from user space,what shall I do to > > > trigger these two methods? > > > > Here's a patch to create a sysfs file for PCI devices. Writing 1 to > > the file will call the device's suspend method, and writing 0 will call > > the resume method. > > > > Alan Stern > > > Thanks. > > However in the following link, I saw your comments, > http://bugzilla.kernel.org/show_bug.cgi?id=6193 > > "echo 3 >/sys/devices/pci0000:00/0000:00:10.2/power/state > > which should suspend just that one UHCI controller," > > > Then I tried in my box, > > localhost:~ # lspci | grep USB > 00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 > Family) USB UHCI #1 (rev 03) > 00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 > Family) USB UHCI #2 (rev 03) > 00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 > Family) USB UHCI #3 (rev 03) > 00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 > Family) USB UHCI #4 (rev 03) > 00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 > Family) USB2 EHCI Controller (rev 03) > localhost:~ # cat /sys/devices/pci0000\:00/0000\:00\:1d.0/power/state > 0 > localhost:~ # echo 3 >/sys/devices/pci0000:00/0000:00:1d.0/power/state > -bash: echo: write error: Invalid argument > > But this command failed to work.(both usbcore and uhci-hcd are inserted already) > The kernel I am using is 126.96.36.199. > > Regards > Jason > I also tried echo -n 3 > ... echo -n 3 >/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-0:1.0/power/state echo -n 3 >/sys/devices/pci0000:00/0000:00:1d.0/usb1/power/state echo -n 3 >/sys/devices/pci0000:00/0000:00:1d.0/power/state The first two commands works well,but the third one doesn't. Then I do: localhost:~ # lspci -vvv -s 1d.0 00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03) (prog-if 00 [UHCI]) Subsystem: Dell Unknown device 018f Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin A routed to IRQ 16 Region 4: I/O ports at bf80 [size=32] Is "Cap-" indicating that the controller is not able to perform power management? Regards Jason ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ linux-usb-devel@xxxxxxxxxxxxxxxxxxxxx To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel