linux-kernel - Re: [PATCH v6 3/6] PCI: qcom: Add missing icc bandwidth vote for cpu to PCIe path

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Message-ID: <ZaZgba6wSMtuHz7i@hovoldconsulting.com>
Date: Tue, 16 Jan 2024 11:54:37 +0100
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Krishna chaitanya chundru <quic_krichai@...cinc.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	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>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Brian Masney <bmasney@...hat.com>,
	Georgi Djakov <djakov@...nel.org>, linux-arm-msm@...r.kernel.org,
	vireshk@...nel.org, quic_vbadigan@...cinc.com,
	quic_skananth@...cinc.com, quic_nitegupt@...cinc.com,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v6 3/6] PCI: qcom: Add missing icc bandwidth vote for cpu
 to PCIe path

On Fri, Jan 12, 2024 at 11:37:03PM +0100, Konrad Dybcio wrote:
> On 12.01.2024 16:59, Johan Hovold wrote:
> > On Fri, Jan 12, 2024 at 07:52:02PM +0530, Krishna chaitanya chundru wrote:
> >> CPU-PCIe path consits for registers PCIe BAR space, config space.
> > 
> > consits?
> > 
> >> As there is less access on this path compared to pcie to mem path
> >> add minimum vote i.e GEN1x1 bandwidth always.
> > 
> > gen1 bandwidth can't be right.
> > 
> >> In suspend remove the cpu vote after register space access is done.
> >>
> >> Fixes: c4860af88d0c ("PCI: qcom: Add basic interconnect support")
> >> cc: stable@...r.kernel.org
> > 
> > This does not look like a fix so drop the above.
> > 
> > The commit you refer to explicitly left this path unconfigured for now
> > and only added support for the configuring the mem path as needed on
> > sc8280xp which otherwise would crash.
> 
> I only sorta agree. I'd include a fixes tag but point it to either 8450
> addition or original driver introduction, as this is patching up a real
> hole (see my reply to Bryan).

Right, the above Fixes tag is not correct in any case.

And with a complete commit message it may be possible to tell whether
a Fixes tag is warranted or not.

Johan