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: <1b7912c5-983c-b642-ca56-ae1e2def9633@quicinc.com>
Date: Tue, 16 Jan 2024 10:22:44 +0530
From: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.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 1/12/2024 8:47 PM, 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.
> 
> I'm not sure if you are asked to put a Fixes here but it seems to be it 
> should either be dropped or require a parallel Fixes: tag for the dts 
> and yaml changes.
> 
> What is the bug this change fixes in the backport ?
> 
There is no change required in the dts because the cpu-pcie path is
already present in the dts.
So till now driver is ignoring that path, that's why we tagged with
fixed.

-Krishna Chaitanya
>> cc: stable@...r.kernel.org
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> 
> ---
> bod