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RE: [Ilw] Intel Wireless 7260 hardware timed out randomly

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> 
> [+cc Bjørn]
> 
> On Tue, Nov 12, 2013 at 10:39 PM, wzyboy <wzyboy@xxxxxxxxxx> wrote:
> > 2013/11/13 Bjorn Helgaas <bhelgaas@xxxxxxxxxx>:
> >> wzyboy, can you run these commands before the bug occurs and before
> >> using the "setpci" workaround:
> >>
> >>   lspci -vvxxxx -s00:1c.1
> >>   lspci -vvxxxx -s03:00.0
> >
> > After today's morning lessons I booted up my laptop with pci=earlydump
> > kernel perameter and here are the output of lspci (without setpci and
> > before bug hit) and dmesg.
> 
> Thanks.  Are you 100% sure the lspci output is before the setpci workaround?
> The dmesg earlydump shows this (the ASPM control bits are in the 16-bit Link
> Control register, which is at 0x50 for both
> devices):
> 
>     00:1c.1 Root Port config
>          50: 42 00 11 70 00 b2 14 00 00 00 40 01 00 00 00 00
>     03:00.0 Intel 7260 config:
>          50: 42 01 11 10 00 00 00 00 00 00 00 00 00 00 00 00
> 
> So at boot-time, ASPM was enabled.  But the lspci shows:
> 
>     00:1c.1 Root Port config
>       Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
>         LnkCtl: ASPM Disabled
>          50: 40 00 11 70 00 b2 14 00 00 00 40 01 00 00 00 00
>     03:00.0 Intel 7620 config
>       Capabilities: [40] Express (v2) Endpoint, MSI 00
>         LnkCtl: ASPM Disabled
>          50: 40 01 11 10 00 00 00 00 00 00 00 00 00 00 00 00
> 
> And now ASPM is disabled.  I'm pretty sure the kernel did not disable ASPM,
> so I assume it was disabled by setpci.
> 
> I manually decoded the L1 PM Substates registers for both the Root Port and
> the 7260 device (details appended below), and everything appears enabled
> there (though I think that since ASPM is disabled, L1 PM substates is
> ignored).
> 
> My conclusion is that the BIOS enabled both ASPM and L1 PM substates.
> Obviously the BIOS will do the same when booting Windows, and I assume
> the device works fine with the Windows driver.  Based on our previous
> experience with Windows, I don't think it will change the ASPM configuration
> because the ACPI FADT table and the PCI _OSC method do not grant control
> of ASPM to the OS.  Therefore, I think the problem is in the Linux iwlwifi
> driver.
> 
> I don't think there's anything more I can do here because there's no
> evidence that the PCI core is doing anything wrong.  But if it turns out that we
> *should* be doing something differently, let me know.
> 

Right - no evidence of anything - Thank you a lot for all your help. I have learnt a lot from this thread.
I guess I'll try to disable L1 PM substates with setpci command and see what happens.



> Bjorn
> 
> 
>     00:1c.1 Root Port config
>       Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
>         LnkCtl: ASPM Disabled
>          50: 40 00 11 70 00 b2 14 00 00 00 40 01 00 00 00 00
>       Capabilities: [200 v1] #1e
>         200: 1e 00 01 00 1f 28 28 00 1f 28 a0 40 f0 00 00 00
>         210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>           Header                        0x0001001e
>             ID 0x001e (L1 Substates)
>             Version 1
>           Capabilities                  0x0028281f
>           Control 1                     0x40a0281f
>             0x40a0281f  Control 1
>             0x00000001    PCI-PM L1.2 Enable
>             0x00000002    PCI-PM L1.1 Enable
>             0x00000004    ASPM L1.2 Enable
>             0x00000008    ASPM L1.1 Enable
>             0x00000010    RsvdP
>             0x00002800    Common_Mode_Restore_Time
>             0x00a00000    LTR_L1.2_THRESHOLD_Value
>             0x40000000    LTR_L1.2_THRESHOLD_Scale
>           Control 2                     0x000000f0
>             0x000000f0  Control 2
>             0x000000f0    T_POWER_ON Value
> 
>     03:00.0 Intel 7620 config
>       Capabilities: [40] Express (v2) Endpoint, MSI 00
>         LnkCtl: ASPM Disabled
>          50: 40 01 11 10 00 00 00 00 00 00 00 00 00 00 00 00
>       Capabilities: [154 v1] Vendor Specific Information: ID=cafe
> Rev=1 Len=014 <?>
>         150:             0b 00 01 00 fe ca 41 01 1f 1e f0 00
>         160: 0f 00 a0 40 f0 00 00 00 00 00 00 00 00 00 00 00
>           Header                        0x0001000b
>             ID 0x000b (Vendor-specific)
>             Version 1
>           Vendor-specific header        0x0141cafe
>             VSEC ID 0xcafe
>             VSEC Rev 1
>             Length 0x14
>           Capabilities                  0x00f01e1f
>           Control 1                     0x40a0000f
>             0x40a0000f  Control 1
>             0x00000001    PCI-PM L1.2 Enable
>             0x00000002    PCI-PM L1.1 Enable
>             0x00000004    ASPM L1.2 Enable
>             0x00000008    ASPM L1.1 Enable
>           Control 2                     0x000000f0
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