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: <f9a177e0-3698-4865-9463-220c65c653fb@linaro.org>
Date: Fri, 12 Jan 2024 23:33:15 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 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>
Cc: 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 12.01.2024 16:17, Bryan O'Donoghue wrote:
> On 12/01/2024 14:22, Krishna chaitanya chundru wrote:
>> CPU-PCIe path consits for registers PCIe BAR space, config space.
>> As there is less access on this path compared to pcie to mem path
>> add minimum vote i.e GEN1x1 bandwidth always.
>>
>> In suspend remove the cpu vote after register space access is done.
>>
>> Fixes: c4860af88d0c ("PCI: qcom: Add basic interconnect support")
> 
> If this patch is a Fixes then don't you need the accompanying dts change as a parallel Fixes too ?
> 
> i.e. without the dts update - you won't have the nodes in the dts to consume => applying this code to the stable kernel absent the dts will result in no functional change and therefore no bugfix.

The Fixes tag denotes a bug fix, its use for backport autosel is just
a nice "coincidence".

Fixing a lack of a required icc path and having to rely on BL leftovers
/ keepalive bus settings is definitely worth this tag in my eyes.

Konrad