Hi, Baolu On 11/12/15 at 10:45am, Lu, Baolu wrote: > Hi Dave, > > Which device are you testing with? This implementation was developed > and tested on Intel Skylake devices. > > It doesn't surprise me if it doesn't work with other silicons. But it do > remind me to create a verified-list and put those known-to-work devices > in it. > I have not got time to do more test. What infomation do you want? lsusb -v? > Thanks, > Baolu > > On 11/11/2015 10:25 AM, Dave Young wrote: > >Hi, > > > >On 11/11/15 at 09:32am, Lu, Baolu wrote: > >> > >>On 11/10/2015 05:39 PM, Dave Young wrote: > >>>Hi, > >>> > >>>On 11/09/15 at 03:38pm, Lu Baolu wrote: > >>>>This patch series adds support for early printk through USB3 debug port. > >>>>USB3 debug port is described in xHCI specification as an optional extended > >>>>capability. > >>>> > >>>I did a test with your previous patchset with the manually wired cable. > >>>debug host detected the remote device, but later the devie automaticlly > >>>disconnected and earlyprintk hangs. > >>Hi Dave, > >> > >>What I have done is: > >Retested it, seems it is not stable. I got a sucessful boot with earlyprintk > >But only once and there was no "Press Y to continue", I just blindly pressed Y. > > > >The other tests failed. > > > >Since it is not convinience to test, do you have way to enable the dbc > >after kernel boot? like echo 1 to a sysfs file to enable it. > >>(1) Build a new kernel for debug target with this patch series applied. > >>(2) Add "earlyprintk=xdbc" to the kernel option of debug target. The > >> "keep" option for early printk doesn't support yet. (That's my next > >> target.) > >> > >>(3) Boot the debug host, and disable USB runtime suspend: > >> > >># echo on > /sys/bus/pci/devices/<xhci_pci_bus_name>/power/control > >># echo on | tee /sys/bus/usb/devices/*/power/control > >> > >>(4) Boot the debug target. Check the dmesg message on debug host. > >> > >># tail -f /var/log/kern.log > >> > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.983374] usb 4-3: new SuperSpeed USB > >>device number 4 using xhci_hcd > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999595] usb 4-3: LPM exit latency > >>is zeroed, disabling LPM. > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999899] usb 4-3: New USB device > >>found, idVendor=1d6b, idProduct=0004 > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999902] usb 4-3: New USB device > >>strings: Mfr=1, Product=2, SerialNumber=3 > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999903] usb 4-3: Product: Remote > >>GDB > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999904] usb 4-3: Manufacturer: > >>Linux > >>Nov 12 01:27:50 allen-ult kernel: [ 1815.999905] usb 4-3: SerialNumber: 0001 > >>Nov 12 01:27:50 allen-ult kernel: [ 1816.000240] usb_debug 4-3:1.0: xhci_dbc > >>converter detected > >>Nov 12 01:27:50 allen-ult kernel: [ 1816.000360] usb 4-3: xhci_dbc converter > >>now attached to ttyUSB0 > >> > >>(5) Host has completed enumeration of debug device. Start "minicom" on debug > >>host. > >> > >Most times I have no chance to run minicom before the usb disconnection here. > > > >>Welcome to minicom 2.7 > >> > >>OPTIONS: I18n > >>Compiled on Jan 1 2014, 17:13:19. > >>Port /dev/ttyUSB0, 01:28:02 > >> > >>Press CTRL-A Z for help on special keys > >> > >>Press Y to continue... > >> > >>(6) You should be able to see "Press Y to continue..." (if not, try pressing > >>Enter key) > >>Press Y key, debug target should go ahead with boot and early boot messages > >>should show in mincom. > >> > >>Press Y to continue... > >>[ 0.000000] Initializing cgroup subsys cpuset > >>[ 0.000000] Initializing cgroup subsys cpu > >>[ 0.000000] Initializing cgroup subsys cpuacct > >>[ 0.000000] Linux version 4.3.0-rc7+ (allen@blu-skl) (gcc version 4.8.4 > >>(Ubuntu 4.8.4-2ubuntu1~14.04) 5 > >>[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.3.0-rc7+ > >>root=UUID=5a2fb856-0238-4b6e-aa45-beeccb7 > >>[ 0.000000] KERNEL supported cpus: > >> > >>[...skipped...] > >> > >>[ 0.000000] Offload RCU callbacks from CPUs: 0-7. > >>[ 0.000000] Console: colour dummy device 80x25 > >>[ 0.000000] console [tty0] enabled > >>[ 0.000000] bootconsole [earlyxdbc0] disabled > >> > >> > >>So "the devie automaticlly disconnected and earlyprintk hangs" happens in > >>which step? > >> > >Here is some log on host side. > > > >[ 1568.052135] usb 2-2: new SuperSpeed USB device number 5 using xhci_hcd > >[ 1568.063416] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1568.063750] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1568.063751] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1568.063752] usb 2-2: Product: Remote GDB > >[ 1568.063753] usb 2-2: Manufacturer: Linux > >[ 1568.063754] usb 2-2: SerialNumber: 0001 > >[ 1568.065580] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1568.066309] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1580.464706] usb 2-2: USB disconnect, device number 5 > >[ 1580.464996] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1580.465062] usb_debug 2-2:1.0: device disconnected > >[ 1580.670743] usb 2-2: new SuperSpeed USB device number 6 using xhci_hcd > >[ 1580.682068] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1580.682667] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1580.682672] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1580.682675] usb 2-2: Product: Remote GDB > >[ 1580.682678] usb 2-2: Manufacturer: Linux > >[ 1580.682681] usb 2-2: SerialNumber: 0001 > >[ 1580.685190] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1580.687106] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1586.751477] usb 2-2: USB disconnect, device number 6 > >[ 1586.754248] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1586.754287] usb_debug 2-2:1.0: device disconnected > >[ 1586.960399] usb 2-2: new SuperSpeed USB device number 7 using xhci_hcd > >[ 1586.971562] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1586.971916] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1586.971918] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1586.971919] usb 2-2: Product: Remote GDB > >[ 1586.971921] usb 2-2: Manufacturer: Linux > >[ 1586.971922] usb 2-2: SerialNumber: 0001 > >[ 1586.973140] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1586.973939] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1616.615418] usb 2-2: USB disconnect, device number 7 > >[ 1616.617865] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1616.617918] usb_debug 2-2:1.0: device disconnected > >[ 1616.823351] usb 2-2: new SuperSpeed USB device number 8 using xhci_hcd > >[ 1616.834520] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1616.834856] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1616.834858] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1616.834859] usb 2-2: Product: Remote GDB > >[ 1616.834860] usb 2-2: Manufacturer: Linux > >[ 1616.834860] usb 2-2: SerialNumber: 0001 > >[ 1616.836715] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1616.837327] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1622.719311] usb 2-2: USB disconnect, device number 8 > >[ 1622.721962] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1622.721995] usb_debug 2-2:1.0: device disconnected > >[ 1622.928226] usb 2-2: new SuperSpeed USB device number 9 using xhci_hcd > >[ 1622.939383] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1622.939714] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1622.939715] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1622.939716] usb 2-2: Product: Remote GDB > >[ 1622.939717] usb 2-2: Manufacturer: Linux > >[ 1622.939718] usb 2-2: SerialNumber: 0001 > >[ 1622.941593] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1622.942187] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1631.312112] usb 2-2: USB disconnect, device number 9 > >[ 1631.315427] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1631.315465] usb_debug 2-2:1.0: device disconnected > >[ 1631.521007] usb 2-2: new SuperSpeed USB device number 10 using xhci_hcd > >[ 1631.532212] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1631.532544] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1631.532545] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1631.532546] usb 2-2: Product: Remote GDB > >[ 1631.532547] usb 2-2: Manufacturer: Linux > >[ 1631.532548] usb 2-2: SerialNumber: 0001 > >[ 1631.534413] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1631.535117] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1633.252488] usb 2-2: USB disconnect, device number 10 > >[ 1633.255279] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1633.255314] usb_debug 2-2:1.0: device disconnected > >[ 1633.461411] usb 2-2: new SuperSpeed USB device number 11 using xhci_hcd > >[ 1633.472598] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1633.472932] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1633.472933] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1633.472934] usb 2-2: Product: Remote GDB > >[ 1633.472935] usb 2-2: Manufacturer: Linux > >[ 1633.472936] usb 2-2: SerialNumber: 0001 > >[ 1633.473987] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1633.474624] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > >[ 1633.900927] usb 2-2: USB disconnect, device number 11 > >[ 1633.901176] xhci_dbc ttyUSB0: xhci_dbc converter now disconnected from ttyUSB0 > >[ 1633.901226] usb_debug 2-2:1.0: device disconnected > >[ 1634.106831] usb 2-2: new SuperSpeed USB device number 12 using xhci_hcd > >[ 1634.117987] usb 2-2: LPM exit latency is zeroed, disabling LPM. > >[ 1634.118328] usb 2-2: New USB device found, idVendor=1d6b, idProduct=0004 > >[ 1634.118329] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > >[ 1634.118330] usb 2-2: Product: Remote GDB > >[ 1634.118331] usb 2-2: Manufacturer: Linux > >[ 1634.118332] usb 2-2: SerialNumber: 0001 > >[ 1634.120194] usb_debug 2-2:1.0: xhci_dbc converter detected > >[ 1634.120949] usb 2-2: xhci_dbc converter now attached to ttyUSB0 > > > >Thanks > >Dave > >-- > >To unsubscribe from this list: send the line "unsubscribe linux-usb" in > >the body of a message to majordomo@xxxxxxxxxxxxxxx > >More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
