[REGRESSION] mainline/master: Apalis iMX6 no longer boots

[Francesco Dolcini]

On Thu, Aug 13, 2026 at 09:34:01AM +0200, Franz Schnyder wrote:
> On Wed, Aug 12, 2026 at 08:54:13AM +0200, Francesco Dolcini wrote:
> > So, unless I did some mistake in my manual test, the issue is related to the specific
> > PCIe card or some other subtle difference I cannot see yet.
> > 
> > For the record, the failure was detected by our CI/CD, and it is systematically
> > reproduced on multiple hardware boards.
> > 
> > Leonardo: any chance you can test with the same PCIe board that is failing?
> 
> I reproduced the issue on my setup (eval board + same PCIe card as in our CI/CD).
> 
> root at apalis-imx6-11486042:~# lspci
> root at apalis-imx6-11486042:~# dmesg | grep pcie
> [    0.162860] imx6q-pcie 1ffc000.pcie: host bridge /soc/pcie at 1ffc000 ranges:
> [    0.162974] imx6q-pcie 1ffc000.pcie:       IO 0x0001f80000..0x0001f8ffff -> 0x0000000000
> [    0.163043] imx6q-pcie 1ffc000.pcie:      MEM 0x0001000000..0x0001efffff -> 0x0001000000
> [    0.163193] imx6q-pcie 1ffc000.pcie: config reg[1] 0x01f00000 == cpu 0x01f00000
> [    0.505056] imx6q-pcie 1ffc000.pcie: iATU: unroll F, 4 ob, 4 ib, align 64K, limit 4G
> [    0.505230] imx6q-pcie 1ffc000.pcie: Link: Only Gen1 is enabled
> [    1.508173] imx6q-pcie 1ffc000.pcie: Link failed to come up. LTSSM: POLL_CONFIG
> [    1.508314] imx6q-pcie 1ffc000.pcie: probe with driver imx6q-pcie failed with error -110
> 
> After applying the new sequence proposed by Zhu, the PCIe card comes up.
> 
> root at apalis-imx6-11486042:~# lspci
> 00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01)
> 01:00.0 SATA controller: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller (rev 02)
> root at apalis-imx6-11486042:~# dmesg | grep pcie
> [    0.162515] imx6q-pcie 1ffc000.pcie: host bridge /soc/pcie at 1ffc000 ranges:
> [    0.162636] imx6q-pcie 1ffc000.pcie:       IO 0x0001f80000..0x0001f8ffff -> 0x0000000000
> [    0.162702] imx6q-pcie 1ffc000.pcie:      MEM 0x0001000000..0x0001efffff -> 0x0001000000
> [    0.162828] imx6q-pcie 1ffc000.pcie: config reg[1] 0x01f00000 == cpu 0x01f00000
> [    0.488893] imx6q-pcie 1ffc000.pcie: iATU: unroll F, 4 ob, 4 ib, align 64K, limit 4G
> [    0.489033] imx6q-pcie 1ffc000.pcie: Link: Only Gen1 is enabled
> [    0.591333] imx6q-pcie 1ffc000.pcie: PCIe Gen.1 x1 link up
> [    0.591967] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00
> [    0.602947] pcieport 0000:00:00.0: PME: Signaling with IRQ 291
> [    0.603534] pcieport 0000:00:00.0: AER: enabled with IRQ 291
> 
> I'm completely out of the loop on this whole issue and I only helped out
> to test the patch. However, I wanted to add that before applying Zhu's 
> proposed sequence, I could only reproduce the issue by power cycling the
> module, as rebooting alone did not trigger the issue.

Interesting. This might explain why I couldn’t reproduce the issue in my
setup, rather than the difference being caused by the specific PCIe
card.

Franz: thanks for the test.

Richard: will you submit a formal patch, so we try to finally fix this
issue?  I guess it's now too late for 7.2, so be sure to cc:stable and
have a fixes tag.

Francesco