Hi : I have a customized xscale based board, with philips ISP1562 PCI USB controller, I am using linux-2.6.17.8 without "CONFIG_PM" option. When booting up with a flash drive plugged, the kernel seems to be able detect and configure the host controller correctly, but it's not be able to detect the flash device. I added some debugging code in "ehci_irq" function, here is what happened.
1. ehci_irq is called, with status = 0x00000004 , corresponds to "PCD: Port Change Detected" 2. read from command register returned 10009, corresponds to controller is in "RUN" mode. 3. Read port status register (2 ports total), port#1 return 0, port#2 returned 1002, by looking at the code bellow: status = readl (&ehci->regs->port_status [i]); 634 if (status & PORT_OWNER) 635 continue; 636 if (!(status & PORT_RESUME) 637 || ehci->reset_done [i] != 0) 638 continue; 639 640 /* start 20 msec resume signaling from this port, 641 * and make khubd collect PORT_STAT_C_SUSPEND to 642 * stop that signaling. 643 */ 644 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20); 645 ehci_dbg (ehci, "port %d remote wakeup\n", i + 1); 648 usb_hcd_resume_root_hub(hcd); The code expects the PORT_RESUME of the status register to be set, thus to resume root hub, however that bit i read from status register is not set! Could this related to hardware ? Another question is, Do I HAVE TO enable "CONFIG_PM" to make this piece of code working? Because if CONFIG_PM is not defined , the "usb_hcd_resume_root_hub() " does nothing. Onemore thing troubles me is that why the ports are powered down after ehci driver is loaded , i didn't enable PM option! Bellow is the bootup log related to EHCI portion. Please shed some lights on me , or direct me to the right list! Thanks a lot ! chris, sun ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ehci_hcd: block sizes: qh 128 qtd 96 itd 192 sitd 96 PCI: enabling device 0000:00:0d.2 (0140 -> 0142) PCI: Enabling bus mastering for device 0000:00:0d.2 ehci_hcd 0000:00:0d.2: EHCI Host Controller drivers/usb/core/inode.c: creating file 'devices' drivers/usb/core/inode.c: creating file '001' ehci_hcd 0000:00:0d.2: new USB bus registered, assigned bus number 1 ehci_hcd 0000:00:0d.2: reset hcs_params 0x2192 dbg=0 cc=2 pcc=1 ports=2 ehci_hcd 0000:00:0d.2: reset portroute 1 0 ehci_hcd 0000:00:0d.2: reset hcc_params 0012 thresh 1 uframes 256/512/1024 PCI: Enabling Mem-Wr-Inval for device 0000:00:0d.2 ehci_hcd 0000:00:0d.2: MWI active ehci_hcd 0000:00:0d.2: ...powerdown ports... ehci_hcd 0000:00:0d.2: supports USB remote wakeup ehci_hcd 0000:00:0d.2: irq 28, io mem 0x4b002000 ehci_hcd 0000:00:0d.2: reset command 080002 (park)=0 ithresh=8 period=1024 Reset HALT ehci_hcd 0000:00:0d.2: init command 010009 (park)=0 ithresh=1 period=256 RUN ehci_hcd 0000:00:0d.2: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004 usb usb1: default language 0x0409 usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: EHCI Host Controller usb usb1: Manufacturer: Linux 2.6.17.8 ehci_hcd usb usb1: SerialNumber: 0000:00:0d.2 usb usb1: uevent usb usb1: configuration #1 chosen from 1 choice usb usb1: adding 1-0:1.0 (config #1, interface 0) usb 1-0:1.0: uevent hub 1-0:1.0: usb_probe_interface hub 1-0:1.0: usb_probe_interface - got id hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected hub 1-0:1.0: standalone hub hub 1-0:1.0: individual port power switching hub 1-0:1.0: individual port over-current protection hub 1-0:1.0: Single TT hub 1-0:1.0: TT requires at most 8 FS bit times (666 ns) hub 1-0:1.0: power on to power good time: 20ms hub 1-0:1.0: local power source is good hub 1-0:1.0: enabling power on all ports ehci_irq: status=0x00000004 addr=0x4b002024 PCD deteted, i=2 command=10009 status=0 reset_done=0 status=1002 reset_done=0 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users