linux-kernel - Re: [PATCH v2] of: address: Work around missing device

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Message-ID: <20200930234857.g2gxdablzaewvwfq@oden.dyn.berto.se>
Date:   Thu, 1 Oct 2020 01:48:57 +0200
From:   Niklas Söderlund <niklas.soderlund@...natech.se>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <maz@...nel.org>, devicetree@...r.kernel.org,
        PCI <linux-pci@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Frank Rowand <frowand.list@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        Samuel Dionne-Riel <samuel@...nne-riel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] of: address: Work around missing device_type property
 in pcie nodes

Hi Bjorn,

On 2020-09-30 17:51:54 -0500, Bjorn Helgaas wrote:
> On Wed, Sep 30, 2020 at 03:34:10PM -0500, Rob Herring wrote:
> > On Wed, Sep 30, 2020 at 12:37 PM Niklas Söderlund
> > <niklas.soderlund@...natech.se> wrote:
> > >
> > > Hi Marc,
> > >
> > > On 2020-09-30 18:23:21 +0100, Marc Zyngier wrote:
> > > > Hi Niklas,
> > > >
> > > > [+ Samuel]
> > > >
> > > > On 2020-09-30 17:27, Niklas Söderlund wrote:
> > > > > Hi Marc,
> > > > >
> > > > > I'm afraid this commit breaks booting my rk3399 device.
> > > > >
> > > > > I bisected the problem to this patch merged as [1]. I'm testing on a
> > > > > Scarlet device and I'm using the unmodified upstream
> > > > > rk3399-gru-scarlet-inx.dtb for my tests.
> > > > >
> > > > > The problem I'm experience is a black screen after the bootloader and
> > > > > the device is none responsive over the network. I have no serial console
> > > > > to this device so I'm afraid I can't tell you if there is anything
> > > > > useful on to aid debugging there.
> > > > >
> > > > > If I try to test one commit earlier [2] the system boots as expected and
> > > > > everything works as it did for me in v5.8 and earlier. I have worked
> > > > > little with this device and have no clue about what is really on the PCI
> > > > > buss. But running from [2] I have this info about PCI if it's helpful,
> > > > > please ask if somethings missing.
> > > >
> > > > Please see the thread at [1]. The problem was reported a few weeks back
> > > > by Samuel, and I was expecting Rob and Lorenzo to push a fix for this.
> > >
> > > Thanks for providing a solution.
> > >
> > > >
> > > > Rob, Lorenzo, any update on this?
> > 
> > The fix is in Bjorn's tree[1].
> > 
> > Bjorn, going to send this to Linus before v5.9 is out?
> 
> Definitely, thanks for the reminder.  I'm assuming the fix in question
> is https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=for-linus&id=e338eecf3fe79054e8a31b8c39a1234b5acfdabe

That patch solves my boot problem.

Cherry-picked and tested directly on-top of v5.9-rc7 (which fails to 
boot without the patch in question).

> 
> > [1] https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=for-linus

-- 
Regards,
Niklas Söderlund