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06 Aug 2021 13:40:05 +0200 Subject: Re: [PATCH 0/3] CM4 ACPI PCIe quirk To: Jeremy Linton Cc: linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, nsaenz@kernel.org, bhelgaas@google.com, rjw@rjwysocki.net, lenb@kernel.org, robh@kernel.org, kw@linux.com, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20210805211200.491275-1-jeremy.linton@arm.com> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq bXlZd21DR0tqRnRMCi9Eb1VNRVZIRHhDSjQ3Qk1YbzM0NGZIVjFDM0FudWRnTjFCZWhMb0J0 TEh4bW5lQ3pnSDNLY1B0V1c3cHRqNEcKdEp2OUNRRFp5MjdTS29FUHh5YUk4Q0YweWdSeEpj NzJNOUk5d21zUFo1YlVIc0x1WVdNcVE3SmNSbVBzNkQ4ZwpCa2srOC95bmdFeU5FeHd4SnBS 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mfrJLvr8EwqyxvEGGqkkt47nYwUp/fxK1YRsn5g0g4LDNVBC4c0lj/AwSZcPm6LJjzajTbQVo jSj0aikxGn/yma/NBArRmpFmpmOghhxNiGz9exo8LWx5jNNflhpcyK/HiGCavYqF1T8qW449c aXE359iufnuMpkQ4Rxkw== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jeremy, Am 05.08.21 um 23:11 schrieb Jeremy Linton: > The PFTF CM4 is an ACPI platform that is following the PCIe SMCCC > standard because its PCIe config space isn't ECAM compliant and is > split into two parts. One part for the root port registers and a > moveable window which points at a given device's 4K config space. > Thus it doesn't have a MCFG (and really any MCFG provided would be > nonsense anyway). As linux doesn't support the PCIe SMCCC standard > we key off a linux specific host bridge _DSD to add custom ECAM > ops and cfgres. The cfg op selects between those two regions, as > well as disallowing problematic accesses, particularly if the link > is down because there isn't an attached device. i just want to inform you, that i recently submitted the inital patch series for DT support regarding CM4 [1]. I left out anything related to PCIe (including downstream changes to pcie-brcmstb). Best regards Stefan [1] - https://marc.info/?l=linux-arm-kernel&m=162782110325813&w=2