linux-kernel - Re: [PATCH v2 3/4] arm64: dts: marvell: cn9132-clearfog: fix multi-lane pci x2 and x4 ports

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Message-ID: <9272b233-b710-4e57-b3ff-735f45c03c74@lunn.ch>
Date: Fri, 12 Sep 2025 00:12:48 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Josua Mayer <josua@...id-run.com>
Cc: Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 3/4] arm64: dts: marvell: cn9132-clearfog: fix
 multi-lane pci x2 and x4 ports

On Thu, Sep 11, 2025 at 08:28:06PM +0200, Josua Mayer wrote:
> The mvebu-comphy driver does not currently know how to pass correct
> lane-count to ATF while configuring the serdes lanes.
> 
> This causes the system to hard reset during reconfiguration, if a pci
> card is present and has established a link during bootloader.
> 
> Remove the comphy handles from the respective pci nodes to avoid runtime
> reconfiguration, relying solely on bootloader configuration - while
> avoiding the hard reset.
> 
> When bootloader has configured the lanes correctly, the pci ports are
> functional under Linux.

Does this require a specific bootloader? Can i use mainline grub or
bareboot?

	Andrew