linux-kernel - Re: [PATCH v2] PCI: dw-rockchip: Enable async probe by default

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Message-ID: <CANAwSgTWXBhhDk4Yq3U8qTTRBUOx24MvM7moWoKFkKU8Nn6eAw@mail.gmail.com>
Date: Tue, 7 Jan 2025 20:27:58 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Niklas Cassel <cassel@...nel.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Heiko Stuebner <heiko@...ech.de>, 
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: dw-rockchip: Enable async probe by default

Hi Andrew

On Tue, 7 Jan 2025 at 18:43, Andrew Lunn <andrew@...n.ch> wrote:
>
> > I was just trying to understand the call trace for mdio bus which got
> > me confused.
> >
> > [0] https://lore.kernel.org/all/Z3fKkTSFFcU9gQLg@ryzen/
>
> There is nothing particularly unusual in there. We see PCI bus
> enumeration has found a device and bound a driver to it. The driver
> has instantiated an MDIO bus, which has scanned the MDIO bus and found
> a PHY. The phylib core then tried to load the kernel module needed to
> drive the PHY.
>
> Just because it is a PCI device does not mean firmware has to control
> all the hardware. Linux has no problems controlling all this, and it
> saves reinventing the wheel in firmware, avoids firmware bugs, and
> allows new features to be added etc.
>
>         Andrew

Thanks for clarifying.

-Anand