linux-kernel - v5.10-rc2 kernel unable to initialize RK3399 pcie root complex

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Message-ID: <ff0d9bba-3c24-56e1-b598-ae8dd07cfa10@suse.com>
Date:   Wed, 4 Nov 2020 20:16:49 +0800
From:   Qu Wenruo <wqu@...e.com>
To:     linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org
Subject: v5.10-rc2 kernel unable to initialize RK3399 pcie root complex

Hi,

Recently I tried to run v5.10-rc2 kernel on my RK3399 board (Rock Pi 4B,
4G ram version), most drivers work, but the PCIE RC of the board fails
to register, without obvious dmesg error.

My previous v5.9 kernel runs pretty fine on that board, and can boot
from root on LVM on NVME device without any problem.

But for v5.10-rc2 kernel, the root complex just refuses to initialize.
Although the rockchip pcie seems to be detected, but no PCIE bus added
at all.

Also tried to add CONFIG_PCI_DEBUG, but still no pci related dmesg
except the rockchip pcie controller trying to initialize.

Manjaro ARM's linux-rc kernel has the same problem too, so it doesn't
seem to be a bug in my kernel config.

For the dmesg extracted from initramfs:
https://gist.github.com/adam900710/0415c1f19c07f65f892eeb848fd8dfbe

Is there any known bug related to pci to cause such problem?

Thanks,
Qu