linux-kernel - Re: [PATCH v2 2/4] PCI: brcmstb: Add ACPI config space quirk

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Date:   Sun, 22 Aug 2021 10:52:25 +0200
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jeremy Linton <jeremy.linton@....com>, linux-pci@...r.kernel.org
Cc:     lorenzo.pieralisi@....com, nsaenz@...nel.org, bhelgaas@...gle.com,
        rjw@...ysocki.net, lenb@...nel.org, robh@...nel.org, kw@...ux.com,
        sdonthineni@...dia.com, stefan.wahren@...e.com,
        bcm-kernel-feedback-list@...adcom.com, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] PCI: brcmstb: Add ACPI config space quirk



On 8/19/2021 11:56 PM, Jeremy Linton wrote:
> The PFTF CM4 is an ACPI platform that isn't ECAM compliant. Its config
> space is in two parts. One part is for the root port registers and a
> second moveable window pointing at a device's 4K config space. Thus it
> doesn't have an MCFG, and any MCFG provided would be nonsense
> anyway. Instead, a Linux specific host bridge _DSD selects a custom
> ECAM ops and cfgres. The cfg op picks between those two regions while
> disallowing problematic accesses.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>

Once you address Bjorn's feedback, feel free to add:

Acked-by: Florian Fainelli <f.fainelli@...il.com>

I do wonder if squashing patches 2 and 3 would make more sense, 
otherwise we have a bcm2711_pcie_ops that is unused in patch 2.
-- 
Florian