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Date: Fri, 12 Jan 2024 23:33:15 +0100
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Subject: Re: [PATCH v6 3/6] PCI: qcom: Add missing icc bandwidth vote for cpu
 to PCIe path
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To: Bryan O'Donoghue <bryan.odonoghue@linaro.org>,
 Krishna chaitanya chundru <quic_krichai@quicinc.com>,
 Bjorn Andersson <andersson@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
 Lorenzo Pieralisi <lpieralisi@kernel.org>,
 =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>,
 Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Manivannan Sadhasivam <mani@kernel.org>,
 Rob Herring <robh+dt@kernel.org>, Johan Hovold <johan+linaro@kernel.org>,
 Brian Masney <bmasney@redhat.com>, Georgi Djakov <djakov@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, vireshk@kernel.org,
 quic_vbadigan@quicinc.com, quic_skananth@quicinc.com,
 quic_nitegupt@quicinc.com, linux-pci@vger.kernel.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
 stable@vger.kernel.org
References: <20240112-opp_support-v6-0-77bbf7d0cc37@quicinc.com>
 <20240112-opp_support-v6-3-77bbf7d0cc37@quicinc.com>
 <fecfd2d9-7302-4eb6-92d0-c2efbe824bf4@linaro.org>
From: Konrad Dybcio <konrad.dybcio@linaro.org>
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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