PCI trouble on mvebu (Turris Omnia)
Toke Høiland-Jørgensen
toke at redhat.com
Thu Oct 29 18:09:48 EDT 2020
Toke Høiland-Jørgensen <toke at redhat.com> writes:
> Bjorn Helgaas <helgaas at kernel.org> writes:
>
>> Another experiment: build kernel without CONFIG_PCIEASPM, set $ROOT
>> and $NIC appropriately, and try the following:
>>
>> # Set $ROOT and $NIC (update to match your system):
>>
>> # ROOT=00:02.0
>> # NIC=02:00.0
>
> (these matched the ath10k card, so just went with that)
And since Marek's latest email mentioned that the WLE900 is especially
problematic, I also tried with the other slot that has the mt76 in it:
# ROOT=00:03.0
# NIC=03:00.0
# setpci -s$ROOT CAP_EXP+0xc.l
0003ac12
# setpci -s$ROOT CAP_EXP+0x10.w
0040
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0xc.l
0047dc11
# setpci -s$NIC CAP_EXP+0x10.w
0000
# setpci -s$NIC CAP_EXP+0x12.w
1011
# setpci -s$ROOT CAP_EXP+0x10.w=0x0020
# sleep 1
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x10.w=0x0040
# setpci -s$ROOT CAP_EXP+0x10.w=0x0040
# setpci -s$ROOT CAP_EXP+0x10.w=0x0060
# sleep 1
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x12.w
1011
And based on this I went back and rebuilt the kernel with PCIEASPM
enabled, and now both the WLE200 and the MT76 works with this output:
[ 1.544429] mvebu-pcie soc:pcie: host bridge /soc/pcie ranges:
[ 1.544455] mvebu-pcie soc:pcie: MEM 0x00f1080000..0x00f1081fff -> 0x0000080000
[ 1.544471] mvebu-pcie soc:pcie: MEM 0x00f1040000..0x00f1041fff -> 0x0000040000
[ 1.544485] mvebu-pcie soc:pcie: MEM 0x00f1044000..0x00f1045fff -> 0x0000044000
[ 1.544500] mvebu-pcie soc:pcie: MEM 0x00f1048000..0x00f1049fff -> 0x0000048000
[ 1.544513] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00fffffffe -> 0x0100000000
[ 1.544527] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00fffffffe -> 0x0100000000
[ 1.544540] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00fffffffe -> 0x0200000000
[ 1.544552] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00fffffffe -> 0x0200000000
[ 1.544565] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00fffffffe -> 0x0300000000
[ 1.544577] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00fffffffe -> 0x0300000000
[ 1.544590] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00fffffffe -> 0x0400000000
[ 1.544599] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00fffffffe -> 0x0400000000
[ 1.544768] mvebu-pcie soc:pcie: PCI host bridge to bus 0000:00
[ 1.544776] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 1.544783] pci_bus 0000:00: root bus resource [mem 0xf1080000-0xf1081fff] (bus address [0x00080000-0x00081fff])
[ 1.544789] pci_bus 0000:00: root bus resource [mem 0xf1040000-0xf1041fff] (bus address [0x00040000-0x00041fff])
[ 1.544795] pci_bus 0000:00: root bus resource [mem 0xf1044000-0xf1045fff] (bus address [0x00044000-0x00045fff])
[ 1.544801] pci_bus 0000:00: root bus resource [mem 0xf1048000-0xf1049fff] (bus address [0x00048000-0x00049fff])
[ 1.544806] pci_bus 0000:00: root bus resource [mem 0xe0000000-0xe7ffffff]
[ 1.544811] pci_bus 0000:00: root bus resource [io 0x1000-0xeffff]
[ 1.544882] pci 0000:00:01.0: [11ab:6820] type 01 class 0x060400
[ 1.544896] pci 0000:00:01.0: reg 0x38: [mem 0x00000000-0x000007ff pref]
[ 1.545073] pci 0000:00:02.0: [11ab:6820] type 01 class 0x060400
[ 1.545085] pci 0000:00:02.0: reg 0x38: [mem 0x00000000-0x000007ff pref]
[ 1.545237] pci 0000:00:03.0: [11ab:6820] type 01 class 0x060400
[ 1.545250] pci 0000:00:03.0: reg 0x38: [mem 0x00000000-0x000007ff pref]
[ 1.546030] PCI: bus0: Fast back to back transfers disabled
[ 1.546037] pci 0000:00:01.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 1.546045] pci 0000:00:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 1.546052] pci 0000:00:03.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 1.546132] pci 0000:01:00.0: [168c:002e] type 00 class 0x028000
[ 1.546154] pci 0000:01:00.0: reg 0x10: [mem 0xe8000000-0xe800ffff 64bit]
[ 1.546263] pci 0000:01:00.0: supports D1
[ 1.546268] pci 0000:01:00.0: PME# supported from D0 D1 D3hot
[ 1.546377] pci 0000:00:01.0: ASPM: current common clock configuration is inconsistent, reconfiguring
[ 1.602042] PCI: bus1: Fast back to back transfers enabled
[ 1.602052] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 1.602146] pci 0000:02:00.0: [168c:003c] type 00 class 0x028000
[ 1.602169] pci 0000:02:00.0: reg 0x10: [mem 0xea000000-0xea1fffff 64bit]
[ 1.602201] pci 0000:02:00.0: reg 0x30: [mem 0xea200000-0xea20ffff pref]
[ 1.602280] pci 0000:02:00.0: supports D1 D2
[ 1.602377] pci 0000:00:02.0: ASPM: current common clock configuration is inconsistent, reconfiguring
[ 1.632025] PCI: bus2: Fast back to back transfers enabled
[ 1.632033] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 02
[ 1.632117] pci 0000:03:00.0: [14c3:7612] type 00 class 0x028000
[ 1.632141] pci 0000:03:00.0: reg 0x10: [mem 0xec000000-0xec0fffff 64bit]
[ 1.632175] pci 0000:03:00.0: reg 0x30: [mem 0xec100000-0xec10ffff pref]
[ 1.632262] pci 0000:03:00.0: PME# supported from D0 D3hot D3cold
[ 1.632373] pci 0000:00:03.0: ASPM: current common clock configuration is inconsistent, reconfiguring
[ 1.662037] PCI: bus3: Fast back to back transfers disabled
[ 1.662045] pci_bus 0000:03: busn_res: [bus 03-ff] end is updated to 03
[ 1.662078] pci 0000:00:01.0: BAR 8: assigned [mem 0xe0000000-0xe00fffff]
[ 1.662086] pci 0000:00:02.0: BAR 8: assigned [mem 0xe0200000-0xe04fffff]
[ 1.662093] pci 0000:00:03.0: BAR 8: assigned [mem 0xe0600000-0xe07fffff]
[ 1.662101] pci 0000:00:01.0: BAR 6: assigned [mem 0xe0100000-0xe01007ff pref]
[ 1.662109] pci 0000:00:02.0: BAR 6: assigned [mem 0xe0500000-0xe05007ff pref]
[ 1.662116] pci 0000:00:03.0: BAR 6: assigned [mem 0xe0800000-0xe08007ff pref]
[ 1.662124] pci 0000:01:00.0: BAR 0: assigned [mem 0xe0000000-0xe000ffff 64bit]
[ 1.662135] pci 0000:00:01.0: PCI bridge to [bus 01]
[ 1.662142] pci 0000:00:01.0: bridge window [mem 0xe0000000-0xe00fffff]
[ 1.662151] pci 0000:02:00.0: BAR 0: assigned [mem 0xe0200000-0xe03fffff 64bit]
[ 1.662158] pci 0000:02:00.0: BAR 0: error updating (0xe0200004 != 0xffffffff)
[ 1.662164] pci 0000:02:00.0: BAR 0: error updating (high 0x000000 != 0xffffffff)
[ 1.662170] pci 0000:02:00.0: BAR 6: assigned [mem 0xe0400000-0xe040ffff pref]
[ 1.662176] pci 0000:00:02.0: PCI bridge to [bus 02]
[ 1.662182] pci 0000:00:02.0: bridge window [mem 0xe0200000-0xe04fffff]
[ 1.662190] pci 0000:03:00.0: BAR 0: assigned [mem 0xe0600000-0xe06fffff 64bit]
[ 1.662202] pci 0000:03:00.0: BAR 6: assigned [mem 0xe0700000-0xe070ffff pref]
[ 1.662207] pci 0000:00:03.0: PCI bridge to [bus 03]
[ 1.662212] pci 0000:00:03.0: bridge window [mem 0xe0600000-0xe07fffff]
This has me somewhat puzzled. Investigating further, it turns out that
if I *remove* the MT76 card, the WLE200 starts failing again. So with
just the WLE* cards plugged in, I went back and tried the setpci
sequence again with the WLE200 (with PCIEASPM disabled):
# ROOT=00:01.0
# NIC=01:00.0
# setpci -s$ROOT CAP_EXP+0xc.l
0003ac12
# setpci -s$ROOT CAP_EXP+0x10.w
0040
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0xc.l
00033c11
# setpci -s$NIC CAP_EXP+0x10.w
0000
# setpci -s$NIC CAP_EXP+0x12.w
1011
# setpci -s$ROOT CAP_EXP+0x10.w=0x0020
# sleep 1
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x10.w=0x0040
# setpci -s$ROOT CAP_EXP+0x10.w=0x0040
# setpci -s$ROOT CAP_EXP+0x10.w=0x0060
# sleep 1
# setpci -s$ROOT CAP_EXP+0x12.w
1011
# setpci -s$NIC CAP_EXP+0x12.w
1011
-Toke
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