linux-kernel - Re: [PATCH v2 00/12] arm64: dts: qcom: sc8280xp: PCIe fixes and GICv3 ITS enable

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Date: Fri, 1 Mar 2024 09:01:06 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Johan Hovold <johan@...nel.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Johan Hovold <johan+linaro@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/12] arm64: dts: qcom: sc8280xp: PCIe fixes and
 GICv3 ITS enable

On Thu, Feb 29, 2024 at 02:52:40PM -0600, Bjorn Helgaas wrote:
> On Thu, Feb 29, 2024 at 02:10:21PM +0100, Johan Hovold wrote:
> > On Thu, Feb 29, 2024 at 05:54:16PM +0530, Manivannan Sadhasivam wrote:
> > > On Thu, Feb 29, 2024 at 11:25:48AM +0100, Johan Hovold wrote:
> > 
> > > > As I mentioned, the 'required-opps' binding update is needed to
> > > > fix the missing OPP vote so blocking the binding patch would
> > > > block merging the DT fix which could otherwise go into 6.8.
> > 
> > > I agree that the fix gets the priority. But some maintainers
> > > perfer to merge fix patches _only_ if they are fixing the issue
> > > introduced in the ongoing release.  But if Bjorn has no issues in
> > > merging these for 6.8, then it is fine.
> 
> I do prefer to merge only regression and important fixes after the
> merge window, so I want to be able to provide justification.
> 
> > It also depends on the severity of the issue and to some extent the
> > complexity of the fix. These binding fixes are certainly low risk.
> > :)
> 
> IIUC we're talking about:
> 
>   arm64: dts: qcom: sc8280xp: add missing PCIe minimum OPP

I'd prefer to take this one through my tree. I will double check the
hardware documentation (there are differences in sc8280xp here) and
decide how to proceed...

>   dt-bindings: PCI: qcom: Allow 'required-opps'

Picking this for v6.9 is fine, no practical badness ensues. We would
temporarily have a few additional DeviceTree validation warnings in the
v6.8 release...

Regards,
Bjorn

> 
> These don't look like a regression fix (correct me if I'm wrong), and
> I can't tell whether they fix a user-visible problem, since
> sc8280xp.dtsi does already contain 'required-opps' for ufs_mem_hc,
> usb_0, and usb_1, which are mentioned in the commit log as covering up
> the issue.
> 
> If these patches wait until v6.9, what badness ensues?
> 
> Bjorn