linux-kernel - Re: [PATCH v1 0/3] PCI: brcmstb: Clkreq# accomodations of downstream device

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Message-ID: <CABTDG88MNmMmha96j0ABU4Q3-NKcLfx58wgQ2_GpyLgtAm1bxw@mail.gmail.com>
Date:   Fri, 7 Apr 2023 10:06:19 -0500
From:   Hank Barta <hbarta@...il.com>
To:     Cyril Brulebois <kibi@...ian.org>
Cc:     Jim Quinlan <jim2101024@...il.com>, linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Phil Elwell <phil@...pberrypi.com>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v1 0/3] PCI: brcmstb: Clkreq# accomodations of downstream device

Apologies to anyone who is seeing this for the second time. I forgot
to format as plain text on the first transmission.

Cyril Brulebois kindly provided me with Debian packages for the two
kernels he built and I tested them as well. I can confirm that the one
without the three patches still had the panic on power up and when a
PCIe device is present. Otherwise it booted without difficulty. The
kernel with three patches booted successfully on all tries both cold
and warm with a PCIe/NVME installed. I was also able to mount
partitions on the NVME driver and copy data off.

My hardware

CM4 with WiFi/BT, 8GG RAM and no eMMC.
(Official) I/O board
PCIe/NVME adapter card with Intel 670p SSD installed
32GB Samsung EVO Select SD card (boot device.)

Thanks to all who contributed to this fix.


On Thu, Apr 6, 2023 at 4:31 PM Cyril Brulebois <kibi@...ian.org> wrote:
>
> Hi Jim,
>
> Jim Quinlan <jim2101024@...il.com> (2023-04-06):
> > The current driver assumes the downstream devices can provide clkreq# for
> > ASPM.  These commits accomodate devices w/ or w/o clkreq# and also handle
> > L1SS-capable devices.
> >
> > The Raspian Linux folks have already been using a PCIe RC property
> > "brcm,enable-l1ss".  These commits use the same property, in a
> > backward-compatible manner, and the implementaion adds more detail and also
> > automatically identifies devices w/o a clkreq# signal, i.e. most devices
> > plugged into an RPi CM4 IO board.
> >
> > Jim Quinlan (3):
> >   dt-bindings: PCI: brcmstb: Add two optional props
> >   PCI: brcmstb: Clkreq# accomodations of downstream device
> >   PCI: brcmstb: Allow setting the completion timeout
> >
> >  .../bindings/pci/brcm,stb-pcie.yaml           | 12 +++
> >  drivers/pci/controller/pcie-brcmstb.c         | 93 +++++++++++++++++--
> >  2 files changed, 95 insertions(+), 10 deletions(-)
> >
> >
> > base-commit: 99ddf2254febae9eab7fb0bcc02c5322243f5c49
>
> I've just verified with the exact same hardware as in Bugzilla#217276
> that latest master (v6.3-rc5-137-gf2afccfefe7b) still gets a kernel
> panic at boot, which goes away once those 3 patches are applied. Do you
> need any extra information, log excerpt, or something like that?
>
>
> Cheers,
> --
> Cyril Brulebois (kibi@...ian.org)            <https://debamax.com/>
> D-I release manager -- Release team member -- Freelance Consultant



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