linux-kernel - Re: [PATCH v1] drivers: pci: introduce configurable delay for Rockchip PCIe bus scan

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Message-ID: <87a5r983ea.fsf@tom-fitzhenry.me.uk>
Date:   Mon, 20 Nov 2023 15:15:30 +1100
From:   Tom Fitzhenry <tom@...-fitzhenry.me.uk>
To:     vincenzopalazzodev@...il.com
Cc:     bhelgaas@...gle.com, broonie@...nel.org, heiko@...ech.de,
        kw@...ux.com, lgirdwood@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, lpieralisi@...nel.org,
        robh@...nel.org, shawn.lin@...k-chips.com,
        skhan@...uxfoundation.org, strit@...jaro.org
Subject: Re: [PATCH v1] drivers: pci: introduce configurable delay for
 Rockchip PCIe bus scan

My RockPro64 occasionally failed on boot with this crash dump, at least
since Linux 5.15. Since Linux 6.5, every boot fails in this manner.

I applied a similar patch[0] against Linux 6.6 that sleeps during probe,
and I'm now able to boot successfully each time.

0. https://gitlab.manjaro.org/manjaro-arm/packages/core/linux/-/blob/44e81d83b7e002e9955ac3c54e276218dc9ac76d/1005-rk3399-rp64-pcie-Reimplement-rockchip-PCIe-bus-scan-delay.patch