linux-kernel - Re: [PATCH v1] PCI: brcmstb: Fix regression regarding missing PCIe linkup

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Message-ID: <20220524235605.rz3cyw7akw3327ip@mraw.org>
Date:   Wed, 25 May 2022 01:56:05 +0200
From:   Cyril Brulebois <kibi@...ian.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        James Dutton <james.dutton@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v1] PCI: brcmstb: Fix regression regarding missing PCIe
 linkup

Hi Jim,

Jim Quinlan <jim2101024@...il.com> (2022-05-24):
> Yes. One repo did not have this node (Cyril/debina?), one did
> (https://github.com/raspberrypi/firmware/tree/master/boot).
> Of course there is nothing wrong with omitting the node; it should
> have pcie linkup regardless.

I work/debug stuff on Debian systems, but Debian's just shipping what's
in mainline. Raspberry people maintain their own vendor DTBs.

> Unless you object, I plan on sending you a v2 of my regression fix
> which will correct the commit message, change the "if (busno == 1)"
> conditional to only guard the pcie linkup call, and add further
> comments.
> 
> I have noted and will also address your other concerns and suggestions
> in a future patchset as I think it is best that I get my hands on a
> CM4 board before I submit any more changes.

For the record, I'm still happy to be cc'ed so that I spend time testing
further patches, be it the short-term regression fix (for inclusion in
master, but also checking it fixes linux-5.17.y and now linux-5.18.y,
if stable maintainers would welcome the extra testing), or the future
patchset.

I can't guarantee you'll have an answer in a few hours like that
happened during the past few days (during which I prioritized testing
over anything else so as not to be a blocker in case it could be
squeezed into v5.18). But I'm still willing to allocate some time to
make sure the CM4 keeps working, even if you don't get your hands on
such systems right away.


Cheers,
-- 
Cyril Brulebois (kibi@...ian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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