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

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Date:   Mon, 1 Nov 2021 18:56:49 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        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 Monday 01 November 2021 13:27:11 Jason Gunthorpe wrote:
> On Mon, Nov 01, 2021 at 04:04:05PM +0100, Pali Rohár wrote:
> > - The code relies on rc_pci_fixup being called, which only happens
> >   when CONFIG_PCI_QUIRKS is enabled, so add that to Kconfig. Omitting
> >   this causes a booting failure with a non-obvious cause.
> > - Update rc_pci_fixup to set the class properly, copying the
> >   more modern style from other places
> > - Correct the rc_pci_fixup comment
> > 
> > This patch just re-applies commit 1dc831bf53fd ("ARM: Kirkwood: Update
> > PCI-E fixup") for all other Marvell platforms which use same buggy PCIe
> > controller.
> 
> I wonder if that code is even relevant any more since we started using
> CONFIG_PCI_MVEBU
> 
> ?

It is (still) relevant for platforms which do not use CONFIG_PCI_MVEBU
yet.

> Really, these broken controllers should not be used "raw" but always
> via their special host bridge driver that fixes all the config space
> problems.

I agree.

Long-term goal should be to convert these platforms to use pci-mvebu.c
driver. And until it happens simple fixes like in commit 1dc831bf53fd is
needed for all affected Marvell platforms.

Some details how these Marvell PCIe controllers are broken is in email:
https://lore.kernel.org/linux-pci/20211003120944.3lmwxylnhlp2kfj7@pali/