PCIe trouble on imx6q
Bjorn Helgaas
bhelgaas at google.com
Wed Jan 29 07:59:24 EST 2014
[+cc linux-arm, Richard, Shawn (please keep the cc list)]
On Wed, Jan 29, 2014 at 2:28 AM, Kamel BOUHARA <k.bouhara at gmail.com> wrote:
> ---------- Forwarded message ----------
> From: Kamel BOUHARA <k.bouhara at gmail.com>
> Date: 2014-01-29
> Subject: Re: PCIe trouble on imx6q
> To: Bjorn Helgaas <bhelgaas at google.com>
>
>
> 2014-01-28 Bjorn Helgaas <bhelgaas at google.com>:
>> [+cc Richard, Shawn, linux-arm-kernel (all from MAINTAINERS)]
>>
>> On Tue, Jan 28, 2014 at 1:02 AM, Kamel BOUHARA <k.bouhara at gmail.com> wrote:
>>> Hello,
>>>
>>> Im getting trouble with kernel 3.13 at boot time, the pcie link failed
>>> to get up with the following log:
>>> ------------[ cut here ]------------
>>> WARNING: CPU: 0 PID: 1 at drivers/gpio/gpiolib.c:159 gpio_to_desc+0x34/0x48()
>>> invalid GPIO -2
>>> Modules linked in:
>>> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0+ #4
>>> Backtrace:
>>> [<8001217c>] (dump_backtrace) from [<80012460>] (show_stack+0x18/0x1c)
>>> r6:802b9548 r5:00000000 r4:808d3060 r3:00000000
>>> [<80012448>] (show_stack) from [<806414fc>] (dump_stack+0x84/0x9c)
>>> [<80641478>] (dump_stack) from [<800289f8>] (warn_slowpath_common+0x70/0x94)
>>> r5:00000009 r4:bf05bcb0
>>> [<80028988>] (warn_slowpath_common) from [<80028a54>]
>>> (warn_slowpath_fmt+0x38/0x40)
>>> r8:01f00000 r7:00000000 r6:0011cc11 r5:808b68c0 r4:bf24fa30
>>> [<80028a20>] (warn_slowpath_fmt) from [<802b9548>] (gpio_to_desc+0x34/0x48)
>>> r3:fffffffe r2:807d23fc
>>> [<802b9514>] (gpio_to_desc) from [<802d9de0>] (imx6_pcie_host_init+0x174/0x434)
>>> [<802d9c6c>] (imx6_pcie_host_init) from [<80886dbc>]
>>> (dw_pcie_host_init+0x348/0x41c)
>>> r6:00000000 r5:808d52cc r4:00000020 r3:802d9c6c
>>> [<80886a74>] (dw_pcie_host_init) from [<808871d4>] (imx6_pcie_probe+0x320/0x3dc)
>>> r10:00000000 r9:000000c4 r8:808d539c r7:bf7e3384 r6:bf24fa30 r5:bf135810
>>> r4:bf24fa10
>>> [<80886eb4>] (imx6_pcie_probe) from [<8034b670>] (platform_drv_probe+0x20/0x50)
>>> r8:808d539c r7:00000000 r6:00000000 r5:808d539c r4:bf135810
>>> [<8034b650>] (platform_drv_probe) from [<80349c74>]
>>> (driver_probe_device+0x118/0x234)
>>> r5:bf135810 r4:80e526b8
>>> [<80349b5c>] (driver_probe_device) from [<80349e78>] (__driver_attach+0x9c/0xa0)
>>> r8:80886e90 r7:00000000 r6:bf135844 r5:808d539c r4:bf135810 r3:00000000
>>> [<80349ddc>] (__driver_attach) from [<8034806c>] (bus_for_each_dev+0x68/0x9c)
>>> r6:80349ddc r5:808d539c r4:00000000 r3:00000000
>>> [<80348004>] (bus_for_each_dev) from [<8034972c>] (driver_attach+0x20/0x28)
>>> r6:808df6a8 r5:bf1f5e00 r4:808d539c
>>> [<8034970c>] (driver_attach) from [<803493b0>] (bus_add_driver+0x148/0x1f4)
>>> [<80349268>] (bus_add_driver) from [<8034a4c8>] (driver_register+0x80/0x100)
>>> r7:8090e640 r6:8090e640 r5:00000005 r4:808d539c
>>> [<8034a448>] (driver_register) from [<8034b63c>]
>>> (__platform_driver_register+0x50/0x64)
>>> r5:00000005 r4:808d5388
>>> [<8034b5ec>] (__platform_driver_register) from [<8034b6e0>]
>>> (platform_driver_probe+0x28/0xac)
>>> [<8034b6b8>] (platform_driver_probe) from [<80886ea8>]
>>> (imx6_pcie_init+0x18/0x24)
>>> r5:00000005 r4:808aa104
>>> [<80886e90>] (imx6_pcie_init) from [<80008978>] (do_one_initcall+0x100/0x164)
>>> [<80008878>] (do_one_initcall) from [<8085ecc0>]
>>> (kernel_init_freeable+0x10c/0x1d0)
>>> r10:8089e060 r9:000000c4 r8:8089e050 r7:8090e640 r6:8090e640 r5:00000005
>>> r4:808aa104
>>> [<8085ebb4>] (kernel_init_freeable) from [<8063b67c>] (kernel_init+0x10/0x120)
>>> r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8063b66c
>>> r4:00000000
>>> [<8063b66c>] (kernel_init) from [<8000e9c8>] (ret_from_fork+0x14/0x2c)
>>> r4:00000000 r3:ffffffff
>>> ---[ end trace b5e746dfc2398cd6 ]---
>>> ------------[ cut here ]------------
>>> WARNING: CPU: 0 PID: 1 at drivers/gpio/gpiolib.c:159 gpio_to_desc+0x34/0x48()
>>> invalid GPIO -2
>>> Modules linked in:
>>> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.13.0+ #4
>>> Backtrace:
>>> [<8001217c>] (dump_backtrace) from [<80012460>] (show_stack+0x18/0x1c)
>>> r6:802b9548 r5:00000000 r4:808d3060 r3:00000000
>>> [<80012448>] (show_stack) from [<806414fc>] (dump_stack+0x84/0x9c)
>>> [<80641478>] (dump_stack) from [<800289f8>] (warn_slowpath_common+0x70/0x94)
>>> r5:00000009 r4:bf05bcb0
>>> [<80028988>] (warn_slowpath_common) from [<80028a54>]
>>> (warn_slowpath_fmt+0x38/0x40)
>>> r8:01f00000 r7:00000000 r6:0011cc11 r5:808b68c0 r4:bf24fa30
>>> [<80028a20>] (warn_slowpath_fmt) from [<802b9548>] (gpio_to_desc+0x34/0x48)
>>> r3:fffffffe r2:807d23fc
>>> [<802b9514>] (gpio_to_desc) from [<802d9df8>] (imx6_pcie_host_init+0x18c/0x434)
>>> [<802d9c6c>] (imx6_pcie_host_init) from [<80886dbc>]
>>> (dw_pcie_host_init+0x348/0x41c)
>>> r6:00000000 r5:808d52cc r4:00000020 r3:802d9c6c
>>> [<80886a74>] (dw_pcie_host_init) from [<808871d4>] (imx6_pcie_probe+0x320/0x3dc)
>>> r10:00000000 r9:000000c4 r8:808d539c r7:bf7e3384 r6:bf24fa30 r5:bf135810
>>> r4:bf24fa10
>>> [<80886eb4>] (imx6_pcie_probe) from [<8034b670>] (platform_drv_probe+0x20/0x50)
>>> r8:808d539c r7:00000000 r6:00000000 r5:808d539c r4:bf135810
>>> [<8034b650>] (platform_drv_probe) from [<80349c74>]
>>> (driver_probe_device+0x118/0x234)
>>> r5:bf135810 r4:80e526b8
>>> [<80349b5c>] (driver_probe_device) from [<80349e78>] (__driver_attach+0x9c/0xa0)
>>> r8:80886e90 r7:00000000 r6:bf135844 r5:808d539c r4:bf135810 r3:00000000
>>> [<80349ddc>] (__driver_attach) from [<8034806c>] (bus_for_each_dev+0x68/0x9c)
>>> r6:80349ddc r5:808d539c r4:00000000 r3:00000000
>>> [<80348004>] (bus_for_each_dev) from [<8034972c>] (driver_attach+0x20/0x28)
>>> r6:808df6a8 r5:bf1f5e00 r4:808d539c
>>> [<8034970c>] (driver_attach) from [<803493b0>] (bus_add_driver+0x148/0x1f4)
>>> [<80349268>] (bus_add_driver) from [<8034a4c8>] (driver_register+0x80/0x100)
>>> r7:8090e640 r6:8090e640 r5:00000005 r4:808d539c
>>> [<8034a448>] (driver_register) from [<8034b63c>]
>>> (__platform_driver_register+0x50/0x64)
>>> r5:00000005 r4:808d5388
>>> [<8034b5ec>] (__platform_driver_register) from [<8034b6e0>]
>>> (platform_driver_probe+0x28/0xac)
>>> [<8034b6b8>] (platform_driver_probe) from [<80886ea8>]
>>> (imx6_pcie_init+0x18/0x24)
>>> r5:00000005 r4:808aa104
>>> [<80886e90>] (imx6_pcie_init) from [<80008978>] (do_one_initcall+0x100/0x164)
>>> [<80008878>] (do_one_initcall) from [<8085ecc0>]
>>> (kernel_init_freeable+0x10c/0x1d0)
>>> r10:8089e060 r9:000000c4 r8:8089e050 r7:8090e640 r6:8090e640 r5:00000005
>>> r4:808aa104
>>> [<8085ebb4>] (kernel_init_freeable) from [<8063b67c>] (kernel_init+0x10/0x120)
>>> r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8063b66c
>>> r4:00000000
>>> [<8063b66c>] (kernel_init) from [<8000e9c8>] (ret_from_fork+0x14/0x2c)
>>> r4:00000000 r3:ffffffff
>>> ---[ end trace b5e746dfc2398cd7 ]---
>>> imx6q-pcie 1ffc000.pcie: phy link never came up
>>> PCI host bridge to bus 0000:00
>>> pci_bus 0000:00: root bus resource [io 0x1000-0x10000]
>>> pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff]
>>> pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
>>
>> Not related to the GPIO/link problem, but something's wrong here --
>> the host bridge driver should be telling us what bus numbers are
>> behind the host bridge. Since it didn't, the PCI core had to guess.
>>
>>> PCI: bus0: Fast back to back transfers disabled
>>> PCI: bus1: Fast back to back transfers enabled
>>> pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-0x010fffff]
>>> pci 0000:00:00.0: BAR 6: assigned [mem 0x01100000-0x0110ffff pref]
>>> pci 0000:00:00.0: PCI bridge to [bus 01]
>>> pci 0000:00:00.0: PCI bridge to [bus 01]
>>>
>>> Please, any help is welcome.
>>> Regards,
>>> Kamel.B
>>> --
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>
> So I suppose, this is not a hardware issue rather a bad configuration ?
> Maybe the following log from lspci will be helpful ?
It looks like a configuration issue or an imx6q host bridge issue. In
either case, it looks like something *before* we get to PCIe, so
something like your DT description of the host bridge is more likely
to be useful.
> root at phyFLEX-i:~ lspci -vvv
> 00:00.0 PCI bridge: Device 16c3:abcd (rev 01) (prog-if 00 [Normal decode])
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> ParErr+ Stepping- SERR+ FastB2B- DisINTx+
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0, Cache Line Size: 64 bytes
> Region 0: Memory at 01000000 (32-bit, non-prefetchable) [size=1M]
> Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
> I/O behind bridge: 0000f000-00000fff
> Memory behind bridge: fff00000-000fffff
> Prefetchable memory behind bridge: fff00000-000fffff
> Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- <SERR- <PERR-
> [virtual] Expansion ROM at 01100000 [disabled] [size=64K]
> BridgeCtl: Parity+ SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
> PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
> Capabilities: [40] Power Management version 3
> Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA
> PME(D0+,D1+,D2-,D3hot+,D3cold+)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [50] MSI: Mask+ 64bit+ Count=1/1 Enable+
> Address: 0000000090000000 Data: 0000
> Masking: 00000000 Pending: 00000000
> Capabilities: [70] Express (v2) Root Port (Slot-), MSI 00
> DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
> <64ns, L1 <1us
> ExtTag- RBE+ FLReset-
> DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+
> Unsupported+
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 512 bytes
> DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
> AuxPwr+ TransPend-
> LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1,
> Latency L0 <1us, L1 <8us
> ClockPM- Surprise- LLActRep+ BwNot-
> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train-
> SlotClk+ DLActive- BWMgmt- ABWMgmt-
> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
> PMEIntEna+ CRSVisible-
> RootCap: CRSVisible-
> RootSta: PME ReqID 0000, PMEStatus- PMEPending-
> DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ ARIFwd-
> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- ARIFwd-
> LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance-
> SpeedDis-, Selectable De-emphasis: -6dB
> Transmit Margin: Normal Operating Range,
> EnterModifiedCompliance- ComplianceSOS-
> Compliance De-emphasis: -6dB
> LnkSta2: Current De-emphasis Level: -3.5dB
> Capabilities: [100] Advanced Error Reporting
> UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
> UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
> UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt-
> UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
> AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
> Capabilities: [140] Virtual Channel <?>
> Kernel driver in use: pcieport
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