On Tue, Nov 28, 2017 at 10:00:32AM -0500, Alan Stern wrote: > On Tue, 28 Nov 2017, Greg KH wrote: > > > On Mon, Nov 27, 2017 at 11:08:33PM +0100, Ladislav Michl wrote: > > > Hi there, > > > > > > USB hosts do not discover any connected device on OMAP3 based board > > > with CONFIG_PM=n. Just enabling this option is enough to restore working > > > behaviour. Nothing unusual in log. Tested 4.14.2 and 4.15-rc1. I know > > > a lot of stuff depends on CONFIG_PM, but is this expected behaviour? > > > Neither EHCI nor MUSB is working without CONFIG_PM. > > > > What bus type is your controllers on? PCI? platform? Something else? > > > > And yes, perhaps this is to be expected, why would you not want > > CONFIG_PM to be enabled? :) > > Well, no, it's not expected. Systems are supposed to work correctly > with CONFIG_PM=n -- just not at an optimum power level. Here's relevant part of bootlog: [ 6.466369] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 6.710723] ehci-omap: OMAP-EHCI Host Controller driver [ 7.027862] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 7.336120] ohci-platform: OHCI generic platform driver [ 7.336791] ohci-platform 48064400.ohci: Generic Platform OHCI controller [ 7.336883] ohci-platform 48064400.ohci: new USB bus registered, assigned bus number 1 [ 7.357177] ohci-platform 48064400.ohci: irq 92, io mem 0x48064400 [ 7.402191] omap-mailbox 48094000.mailbox: omap mailbox rev 0x40 [ 7.402343] omap-mailbox: probe of 48094000.mailbox failed with error -38 [ 7.608337] usb usb1: New USB device found, idVendor=1d6b, idProduct=0001 [ 7.608367] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 7.608367] usb usb1: Product: Generic Platform OHCI controller [ 7.608398] usb usb1: Manufacturer: Linux 4.15.0-rc1 ohci_hcd [ 7.608398] usb usb1: SerialNumber: 48064400.ohci [ 7.623779] hub 1-0:1.0: USB hub found [ 7.627380] hub 1-0:1.0: 3 ports detected [ 7.831878] omap-sham 480c3000.sham: hw accel on OMAP rev 0.9 [ 8.218322] twl4030_usb 48070000.i2c:twl@48:twl4030-usb: Initialized TWL4030 USB module [ 8.224212] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver [ 8.224304] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 2 [ 8.242736] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002 [ 8.242767] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 8.242767] usb usb2: Product: MUSB HDRC host driver [ 8.242767] usb usb2: Manufacturer: Linux 4.15.0-rc1 musb-hcd [ 8.242797] usb usb2: SerialNumber: musb-hdrc.0.auto [ 8.246093] hub 2-0:1.0: USB hub found [ 8.246673] hub 2-0:1.0: 1 port detected [ 8.461669] omap-aes 480c5000.aes: OMAP AES hw accel rev: 2.6 [ 8.463500] omap-aes 480c5000.aes: will run requests pump with realtime priority [ 8.937469] input: beeper as /devices/platform/beeper/input/input1 [ 9.188262] ehci-omap 48064800.ehci: EHCI Host Controller [ 9.188323] ehci-omap 48064800.ehci: new USB bus registered, assigned bus number 3 [ 9.188629] ehci-omap 48064800.ehci: irq 93, io mem 0x48064800 [ 9.217407] ehci-omap 48064800.ehci: USB 2.0 started, EHCI 1.00 [ 9.217803] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002 [ 9.217803] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 9.217834] usb usb3: Product: EHCI Host Controller [ 9.217834] usb usb3: Manufacturer: Linux 4.15.0-rc1 ehci_hcd [ 9.217834] usb usb3: SerialNumber: 48064800.ehci [ 9.218841] hub 3-0:1.0: USB hub found [ 9.218963] hub 3-0:1.0: 3 ports detected > EHCI certainly should work without CONFIG_PM. When a device is plugged > in to the EHCI controller, what shows up in > /sys/kernel/debug/usb/ehci/*/registers (fill in the '*' with the > correct bus ID)? $ ls /sys/kernel/debug/usb devices ohci So no ehci. $ cat /sys/kernel/debug/usb/ohci/48064400.ohci/registers bus platform, device 48064400.ohci Generic Platform OHCI controller ohci_hcd OHCI 1.0, NO legacy support registers, rh state running control 0x083 HCFS=operational CBSR=3 cmdstatus 0x00000 SOC=0 intrstatus 0x00000024 FNO SF intrenable 0x8000005a MIE RHSC UE RD WDH hcca frame 0xb9ae fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf fmremaining 0x80000857 FRT FR=0x0857 periodicstart 0x2a2f lsthresh 0x0628 hub poll timer off roothub.a 0a000203 POTPGT=10 NPS NDP=3(3) roothub.b 00000000 PPCM=0000 DR=0000 roothub.status 00008000 DRWE roothub.portstatus [0] 0x00000100 PPS roothub.portstatus [1] 0x00000100 PPS roothub.portstatus [2] 0x00000100 PPS > For that matter, what does that file contain before any devices are > plugged in? For ohci it is the same. Any hint why there's no ehco file? > Alan Stern Thank you, ladis -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
