PCI trouble on mvebu (Turris Omnia)

Tue Oct 27 13:44:00 EDT 2020

On 27/10/2020 18:20, Bjorn Helgaas wrote:
> [+cc vtolkm]
>
> On Tue, Oct 27, 2020 at 04:43:20PM +0100, Toke Høiland-Jørgensen wrote:
>> Hi everyone
>>
>> I'm trying to get a mainline kernel to run on my Turris Omnia, and am
>> having some trouble getting the PCI bus to work correctly. Specifically,
>> I'm running a 5.10-rc1 kernel (torvalds/master as of this moment), with
>> the resource request fix[0] applied on top.
>>
>> The kernel boots fine, and the patch in [0] makes the PCI devices show
>> up. But I'm still getting initialisation errors like these:
>>
>> [    1.632709] pci 0000:01:00.0: BAR 0: error updating (0xe0000004 != 0xffffffff)
>> [    1.632714] pci 0000:01:00.0: BAR 0: error updating (high 0x000000 != 0xffffffff)
>> [    1.632745] pci 0000:02:00.0: BAR 0: error updating (0xe0200004 != 0xffffffff)
>> [    1.632750] pci 0000:02:00.0: BAR 0: error updating (high 0x000000 != 0xffffffff)
>>
>> and the WiFi drivers fail to initialise with what appears to me to be
>> errors related to the bus rather than to the drivers themselves:
>>
>> [    3.509878] ath: phy0: Mac Chip Rev 0xfffc0.f is not supported by this driver
>> [    3.517049] ath: phy0: Unable to initialize hardware; initialization status: -95
>> [    3.524473] ath9k 0000:01:00.0: Failed to initialize device
>> [    3.530081] ath9k: probe of 0000:01:00.0 failed with error -95
>> [    3.536012] ath10k_pci 0000:02:00.0: of_irq_parse_pci: failed with rc=134
>> [    3.543049] pci 0000:00:02.0: enabling device (0140 -> 0142)
>> [    3.548735] ath10k_pci 0000:02:00.0: can't change power state from D3hot to D0 (config space inaccessible)
>> [    3.588592] ath10k_pci 0000:02:00.0: failed to wake up device : -110
>> [    3.595098] ath10k_pci: probe of 0000:02:00.0 failed with error -110
>>
>> lspci looks OK, though:
>>
>> # lspci
>> 00:01.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (rev 04)
>> 00:02.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (rev 04)
>> 00:03.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (rev 04)
>> 01:00.0 Network controller: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
>> 02:00.0 Network controller: Qualcomm Atheros QCA986x/988x 802.11ac Wireless Network Adapter (rev ff)
>>
>> Does anyone have any clue what could be going on here? Is this a bug, or
>> did I miss something in my config or other initialisation? I've tried
>> with both the stock u-boot distributed with the board, and with an
>> upstream u-boot from latest master; doesn't seem to make any different.
> Can you try turning off CONFIG_PCIEASPM?  We had a similar recent
> report at https://bugzilla.kernel.org/show_bug.cgi?id=209833 but I
> don't think we have a fix yet.
>

Got the same device working with > 5.10.0-rc1-next-20201027-to-dirty < 
but ASPM turned off, as mentioned in the cited bug report.

  dmesg | grep ath

ath10k_pci 0000:02:00.0: enabling device (0140 -> 0142)
ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
ath10k_pci 0000:02:00.0: qca988x hw2.0 target 0x4100016c chip_id 
0x043202ff sub 0000:0000
ath9k 0000:03:00.0: enabling device (0140 -> 0142)
ath10k_pci 0000:02:00.0: kconfig debug 1 debugfs 0 tracing 1 dfs 0 
testmode 0
ath10k_pci 0000:02:00.0: firmware ver 10.2.4-1.0-00047 api 5 features 
no-p2p,raw-mode,mfp,allows-mesh-bcast crc32 35bd9258
ath: EEPROM regdomain sanitized
ath: EEPROM regdomain: 0x64
ath: EEPROM indicates we should expect a direct regpair map
ath: Country alpha2 being used: 00
ath: Regpair used: 0x64
ath10k_pci 0000:02:00.0: board_file api 1 bmi_id N/A crc32 bebc7c08
ath10k_pci 0000:02:00.0: htt-ver 2.1 wmi-op 5 htt-op 2 cal otp max-sta 
128 raw 0 hwcrypto 1
ath: EEPROM regdomain sanitized
ath: EEPROM regdomain: 0x64
ath: EEPROM indicates we should expect a direct regpair map
ath: Country alpha2 being used: 00
ath: Regpair used: 0x64
ath10k_pci 0000:02:00.0: pdev param 0 not supported by firmware

----

Note: related issues - workaround compile ath and cfg80211 as modules

(1) https://bugzilla.kernel.org/show_bug.cgi?id=209863
(2) https://bugzilla.kernel.org/show_bug.cgi?id=209855
(3) https://bugzilla.kernel.org/show_bug.cgi?id=209853

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