linux-kernel - Re: [RFC PATCH 2/2] PCI: apple: Add driver for the Apple M1

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Date:   Wed, 18 Aug 2021 20:43:48 +0900
From:   Hector Martin <marcan@...can.st>
To:     Sven Peter <sven@...npeter.dev>, Marc Zyngier <maz@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Stan Skowronek <stan@...ellium.com>,
        Mark Kettenis <kettenis@...nbsd.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] PCI: apple: Add driver for the Apple M1

On 15/08/2021 21.33, Sven Peter wrote:
> The magic comes from the original Corellium driver. It first masks everything
> except for the interrupts in the next line, then acks the interrupts it keeps
> enabled and then probably wants to wait for PORT_INT_LINK_UP (or any of the
> other interrupts which seem to indicate various error conditions) to fire but
> instead polls for PORT_LINKSTS_UP.

Let's not take any magic numbers from their drivers (or what macOS does, 
for that matter) without making an attempt to understand what they do, 
unless it becomes clear it's incomprehensible. This has already bit us 
in the past (the SError disable thing).

-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub