linux-kernel - [PATCH v2 0/2] PCI: xgene: Restore working PCIe functionnality

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Date:   Mon, 21 Mar 2022 10:48:41 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org
Cc:     Rob Herring <robh@...nel.org>,
        Toan Le <toan@...amperecomputing.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stéphane Graber <stgraber@...ntu.com>,
        dann frazier <dann.frazier@...onical.com>,
        kernel-team@...roid.com
Subject: [PATCH v2 0/2] PCI: xgene: Restore working PCIe functionnality

Since 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup") was
merged in the 5.5 time frame, PCIe on the venerable XGene platform has
been unusable: 6dce5aa59e0b broke both XGene-1 (Mustang and m400) and
XGene-2 (Merlin), while the addition of c7a75d07827a ("PCI: xgene: Fix
IB window setup") fixed XGene-2, but left the rest of the zoo
unusable.

It is understood that this systems come with "creative" DTs that don't
match the expectations of modern kernels. However, there is little to
be gained by forcing these changes on users -- the firmware is not
upgradable, and the current owner of the IP will deny that these
machines have ever existed.

Given that, revert both changes and let people enjoy their XGene boxes
once again.

* From v1 [1]:
  - Also revert c7a75d07827a ("PCI: xgene: Fix IB window setup")

[1] https://lore.kernel.org/r/20220314144429.1947610-1-maz@kernel.org

Marc Zyngier (2):
  PCI: xgene: Revert "PCI: xgene: Use inbound resources for setup"
  PCI: xgene: Revert "PCI: xgene: Fix IB window setup"

 drivers/pci/controller/pci-xgene.c | 35 ++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 12 deletions(-)

-- 
2.34.1