linux-kernel - Re: [PATCH v2 4/8] PCI: Change the parent to correctly represent pcie hierarchy

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Message-ID: <20240823083004.rzylgm66yaw3rlyi@thinkpad>
Date: Fri, 23 Aug 2024 14:00:04 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Bartosz Golaszewski <brgl@...ev.pl>,
	Krishna chaitanya chundru <quic_krichai@...cinc.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	cros-qcom-dts-watchers@...omium.org,
	Jingoo Han <jingoohan1@...il.com>, andersson@...nel.org,
	quic_vbadigan@...cinc.com, linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 4/8] PCI: Change the parent to correctly represent
 pcie hierarchy

On Thu, Aug 22, 2024 at 04:13:36PM -0500, Bjorn Helgaas wrote:
> On Thu, Aug 22, 2024 at 10:01:04PM +0200, Bartosz Golaszewski wrote:
> > On Thu, Aug 22, 2024 at 9:28 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > >
> > > On Tue, Aug 13, 2024 at 09:15:06PM +0200, Bartosz Golaszewski wrote:
> > > > On Sat, Aug 3, 2024 at 5:23 AM Krishna chaitanya chundru
> > > > <quic_krichai@...cinc.com> wrote:
> > > > >
> > > > > Currently the pwrctl driver is child of pci-pci bridge driver,
> > > > > this will cause issue when suspend resume is introduced in the pwr
> > > > > control driver. If the supply is removed to the endpoint in the
> > > > > power control driver then the config space access by the
> > > > > pci-pci bridge driver can cause issues like Timeouts.
> > > > >
> > > > > For this reason change the parent to controller from pci-pci bridge.
> > > > >
> > > > > Fixes: 4565d2652a37 ("PCI/pwrctl: Add PCI power control core code")
> > > > > Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> > > > > ---
> > > >
> > > > Tested-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > > >
> > > > Bjorn,
> > > >
> > > > I think this should go into v6.11 as it does indeed better represent
> > > > the underlying logic.
> > >
> > > Is this patch independent of the rest?  I don't think the whole series
> > > looks like v6.11 material, but if this patch can be applied
> > > independently, *and* we can make a case in the commit log for why it
> > > is v6.11 material, we can do that.
> > >
> > > Right now the commit log doesn't tell me enough to justify a
> > > post-merge window change.
> > 
> > Please, apply this patch independently. FYI I have a WiP branch[1]
> > with a v3 of the fixes series rebased on top of this one. Manivannan
> > and I are working on fixing one last remaining issue and I'll resend
> > it. This should go into v6.11.
> 
> OK.  I just need to be able to justify *why* we need it in v6.11, so I
> can apply it as soon as somebody supplies that kind of text for the
> commit log.  I.e., what is broken without this change?  What bad
> things happen if we defer it to v6.12?
> 

I'm not sure if this is a 6.11 material as this patch is not fixing any crash or
potential breakage in 6.11. This patch changes the hierarchy in such a way that
the suspend/resume could work fine once added in the pwrctl drivers.

At the same time, I'd like to get it merged separately for 6.12 instead of
bundling it in this same series.

- Mani

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