Messages in this thread | | | Date | Wed, 1 Mar 2023 16:12:58 +0000 | Subject | Re: [RFC PATCH] irqchip/gic-v3: Claim iomem resources | From | Robin Murphy <> |
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On 2023-02-28 23:22, Marc Zyngier wrote: > On Tue, 28 Feb 2023 23:11:15 +0000, > Tim Harvey <tharvey@gateworks.com> wrote: >> >> I have bisected a kernel issue where octeontx (CN803x) will hang on >> reboot caused by commit c0db06fd0993 ("mmc: core: Disable card detect >> during shutdown"). This commit made it into 5.16 and stable kernels. >> I've found that the patch here which is commit 2b2cd74a06c3 resolves >> this hang but I'm not entirely clear why. >> >> Does anyone have a good explanation of why the hang occurs in the >> first place and why this resolves it? I would like to get the proper >> fix into the affected stable branches. > > Wild guess: the reservation prevents some other driver from probing > because the firmware describes overlapping ranges, and that driver is > what is causing your above hang.
Indeed, according to [1], the GIC appears to overlap one of the "PCIe" windows of &ecam0, which conveniently appears to be the parent of the MMC controller as well.
Robin.
[1] https://github.com/Gateworks/dts-newport/blob/sdk-10.1.1.0-newport/cn81xx-linux.dtsi
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