linux-kernel - Re: [PATCH] PCI: Marvell: Update PCIe fixup

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Date:   Wed, 3 Nov 2021 16:03:16 +0100
From:   Pali Rohár <pali@...nel.org>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Marek Behún <kabel@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Marvell: Update PCIe fixup

On Wednesday 03 November 2021 14:49:07 Maciej W. Rozycki wrote:
> On Tue, 2 Nov 2021, Pali Rohár wrote:
> 
> > Hello Maciej! Thank you very much for the explanation!
> 
>  You are welcome!
> 
> > I'm surprised that Marvell copied this 20 years old MIPS Galileo PCI
> > logic into followup ARM SoC PCIe IPs (and later also into recent ARM64
> > A3720 SoC PCIe IP), removed configuration of PCI class code via
> > strapping pins and let default PCI class code value to Memory device,
> > even also when PCIe controller is running in Root Complex mode. And so
> > correction can be done only from "CPU bus".
> 
>  Still the bootstrap firmware (say U-boot, as I can see it mentioned in 
> your reference) can write the correct value to the class code register.  
> Or can it?

Yes, it can. And I have already sent patches to do it.