PCIe trouble on imx6q

Tue Jan 28 12:36:20 EST 2014

[+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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