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: <dbb10e82-ae10-4987-900b-17d4f4b62099@solid-run.com>
Date: Thu, 18 Sep 2025 10:46:03 +0000
From: Josua Mayer <josua@...id-run.com>
To: Andrew Lunn <andrew@...n.ch>
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"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "stable@...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

Am 12.09.25 um 00:12 schrieb Andrew Lunn:
> 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?

In this case it means U-Boot, i.e. before one would start grub.

I am never quite sure if in this situation I should say "firmware" instead ...