linux-kernel - Re: [PATCH v3 0/3] PCI: apple: Assorted #PERST fixes

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Date:   Tue, 30 Nov 2021 12:45:11 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Luca Ceresoli <luca@...aceresoli.net>, kernel-team@...roid.com,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v3 0/3] PCI: apple: Assorted #PERST fixes

+ Arnd,

On Tue, 30 Nov 2021 12:12:37 +0000,
Lorenzo Pieralisi <lorenzo.pieralisi@....com> wrote:
> 
> On Tue, Nov 30, 2021 at 11:59:32AM +0000, Marc Zyngier wrote:
> > Hi Lorenzo, Bjorn,
> > 
> > On 2021-11-30 11:56, Lorenzo Pieralisi wrote:
> > > On Tue, Nov 23, 2021 at 06:06:33PM +0000, Marc Zyngier wrote:
> > > > Apologies for the rapid fire (I tend to be much more conservative when
> > > > resending series), but given that this series has a direct impact on
> > > > other projects (such as u-boot), I'm trying to converge as quickly as
> > > > possible.
> > > > 
> > > > This series aims at fixing a number of issues for the recently merged
> > > > Apple PCIe driver, all revolving around the mishandling of #PERST:
> > > > 
> > > > - we didn't properly drive #PERST, and we didn't follow the specified
> > > >   timings
> > > > 
> > > > - the DT had the wrong polarity, which has impacts on the driver
> > > >   itself
> > > > 
> > > > Hopefully, this should address all the issues reported so far.
> > > > 
> > > > * From v2:
> > > >   - Fixed DT
> > > >   - Fixed #PERST polarity in the driver
> > > >   - Collected Pali's ack on patch #1
> > > > 
> > > > [1] https://lore.kernel.org/r/20211122104156.518063-1-maz@kernel.org
> > > > 
> > > > Marc Zyngier (3):
> > > >   PCI: apple: Follow the PCIe specifications when resetting the port
> > > >   arm64: dts: apple: t8103: Fix PCIe #PERST polarity
> > > >   PCI: apple: Fix #PERST polarity
> > > > 
> > > >  arch/arm64/boot/dts/apple/t8103.dtsi |  7 ++++---
> > > >  drivers/pci/controller/pcie-apple.c  | 12 +++++++++++-
> > > >  2 files changed, 15 insertions(+), 4 deletions(-)
> > > 
> > > Hi Bjorn,
> > > 
> > > this series is v5.16-rcX material for PCI fixes, can you pick patches
> > > 1,3
> > > up please ?
> > 
> > Do you mind picking patch #2 as well? Or shall I route it somewhere else?
> 
> We were told that we should not pick up dts changes, they would normally
> go via the ARM SOC team, not sure whether the fixes policy is different
> though but I suspect that's not the case.

OK. Doesn't really help with keeping these two commit close together,
but hey, if that can't be helped...

Arnd, do you mind picking up patch #2 as a 5.16 fix?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.