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

[Hongxing Zhu (OSS)]

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@xxxxxxxxxx>
> Sent: Thursday, July 16, 2026 7:48 AM
> To: Leonardo Costa <leoreis.costa@xxxxxxxxx>
> Cc: robh@xxxxxxxxxx; krzk+dt@xxxxxxxxxx; conor+dt@xxxxxxxxxx; Frank Li
> <frank.li@xxxxxxx>; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> festevam@xxxxxxxxx; leonardo.costa@xxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; imx@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> regressions@xxxxxxxxxxxxxxx; Sherry Sun <sherry.sun@xxxxxxx>; Manivannan
> Sadhasivam <mani@xxxxxxxxxx>; Hongxing Zhu <hongxing.zhu@xxxxxxx>; linux-
> pci@xxxxxxxxxxxxxxx
> Subject: Re: [REGRESSION] mainline/master: Apalis iMX6 no longer boots
>
> [+cc Sherry, author of 610fa91d9863, Richard, Mani, linux-pci]
>
> On Mon, Jun 29, 2026 at 11:34:32AM -0300, Leonardo Costa wrote:
> > Hello,
> >
> > We are seeing a regression on Apalis iMX6 where the kernel doesn't
> > boot in the newest v7.2-rc1 (it was working before, in v7.1). The
> > device tree being used is the imx6q-apalis-eval.dtb. The kernel configuration
> used is the one shown below:
> >
> >
> > https://gist/
> > .github.com%2Flcosta37%2F53efdb2fb6e6e0fc05437c7e53b47737&data=05%7
> C02
> > %7Chongxing.zhu%40nxp.com%7C3d58575d22384d61d15608dee2cb7471%7C
> 686ea1d
> >
> 3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639197560620871110%7CUnknow
> n%7CTWF
> >
> pbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMi
> IsI
> >
> kFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=KtTOaEVJI3aq6Bt
> V7Js
> > Y7r%2F9B5LY%2F%2BVj3xEMk592ghk%3D&reserved=0
> >
> > The kernel logs stop almost immediately as the board starts to boot,
> > and I don't notice any difference in the logs that points to the cause.
> >
> > Is this known? We are seeing this behavior on all Apalis iMX6 modules,
> > though we don't see it on Colibri iMX6, so it is not SoC-specific.
>
> This regression is listed on
> https://linux-/
> regtracking.leemhuis.info%2Fregzbot%2Fmainline%2F&data=05%7C02%7Chongx
> ing.zhu%40nxp.com%7C3d58575d22384d61d15608dee2cb7471%7C686ea1d3bc
> 2b4c6fa92cd99c5c301635%7C0%7C0%7C639197560620886501%7CUnknown%
> 7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXa
> W4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=K%2FBs
> xg56w4Jv4Phf%2B7i4CePTQA1M45xNH%2BxcrjuA4r0%3D&reserved=0 as being
> caused by
> https://git.kernel/.
> org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Fcommit
> %2F%3Fh%3Dmaster%26id%3D610fa91d9863&data=05%7C02%7Chongxing.zhu
> %40nxp.com%7C3d58575d22384d61d15608dee2cb7471%7C686ea1d3bc2b4c6f
> a92cd99c5c301635%7C0%7C0%7C639197560620895764%7CUnknown%7CTWF
> pbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMi
> IsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ZT0p2CaXc8EJ
> YM2mlEAJegvmDqObaa%2FFiZtbCvM3PHw%3D&reserved=0
> ("PCI: imx6: Assert PERST# before enabling regulators") but I can't find any bisect
> or other report that specifically points to 610fa91d9863.
>
> Can somebody confirm that reverting 610fa91d9863 fixes this regression, or at
> least that 610fa91d9863^ works and 610fa91d9863 fails?
Sorry for this severe regression. I have posted a fix that has been tested on
my i.MX6Q SabreSD board:

https://lore.kernel.org/imx/20260708035928.580236-2-hongxing.zhu@xxxxxxxxxxx/

Hi Leonardo,

Would you be able to test this patch on your affected boards? Your testing
would help expedite the merge process and ensure the fix resolves the boot
issue you're experiencing.

Best Regards
Richard Zhu
>
> Bjorn