IMX7 PCI-E root error on Linux 5.10

[mst31]

Hello

I have trouble with PCI-E root on IMX7Dual. Sometimes (appr. 10-20% of runnings) PCI-E root initialization failed. In dmesg is printed:

[ 5.743604] pci 0000:00:00.0: can't enable device: BAR 0 [mem 0x00000000-0x000fffff 64bit pref] not claimed
[ 5.753563] pci 0000:00:00.0: Error enabling bridge (-22), continuing
[ 5.760722] pcieport 0000:01:00.0: enabling device (0140 -> 0143)
[ 5.767816] pci 0000:00:00.0: can't enable device: BAR 0 [mem 0x00000000-0x000fffff 64bit pref] not claimed
[ 5.777715] pci 0000:00:00.0: Error enabling bridge (-22), continuing
[ 5.784297] pci 0000:00:00.0: can't enable device: BAR 0 [mem 0x00000000-0x000fffff 64bit pref] not claimed
[ 5.794141] pci 0000:00:00.0: Error enabling bridge (-22), continuing
[ 5.800725] pcieport 0000:02:01.0: enabling device (0140 -> 0143)
[ 5.815680] pci 0000:00:00.0: can't enable device: BAR 0 [mem 0x00000000-0x000fffff 64bit pref] not claimed
[ 5.826639] pci 0000:00:00.0: Error enabling bridge (-22), continuing
[ 5.833205] pcieport 0000:02:02.0: enabling device (0140 -> 0143)
[ 5.846646] pci 0000:00:00.0: can't enable device: BAR 0 [mem 0x00000000-0x000fffff 64bit pref] not claimed
[ 5.857934] pci 0000:00:00.0: Error enabling bridge (-22), continuing

Meanwhile on the bus there are two ethernet adapter and their driver hangs. If initialization of PCI-E root is successful then ethernet works perfectly.

lspci printing if error occures:

00:00.0 Non-VGA unclassified device: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01)
01:00.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:01.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:02.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:03.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
03:00.0 Ethernet controller: Intel Corporation I210 Gigabit Unprogrammed (rev 03)
04:00.0 Ethernet controller: Intel Corporation I210 Gigabit Unprogrammed (rev 03)

lspci printing if all right:

00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01)
01:00.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:01.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:02.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
02:03.0 PCI bridge: Pericom Semiconductor PI7C9X2G404 EL/SL PCIe2 4-Port/4-Lane Packet Switch (rev 05)
03:00.0 Ethernet controller: Intel Corporation I210 Gigabit Unprogrammed (rev 03)
04:00.0 Ethernet controller: Intel Corporation I210 Gigabit Unprogrammed (rev 03)

Linux kernel version 5.10.88 from here:

git clone -b git.kernel.org/linux-stable/linux-5.10.y https://source.codeaurora.org/external/imx/linux-imx

If I use version of kernel 4.14 then error doesn't appear.

What problem is this?

In attachment: config of kernel, dmesg | grep -i 'pci' if error occures (log_bad.txt) and doesn't (log_good.txt).  

[igorpadykov]

Hi Mikhail

how many boards affected by that issue, if this is one board this may be soldering issue.

Also may be recommended to check hardware using attached Hardware Development Guide.

Best regards
igor