linux-kernel - Re: [PATCH v5 1/7] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature

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Message-ID: <0cc247a4-d857-4fb1-8f87-0d52d641eced@oss.qualcomm.com>
Date: Wed, 26 Mar 2025 18:56:02 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        cros-qcom-dts-watchers@...omium.org,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
        quic_vpernami@...cinc.com, mmareddy@...cinc.com
Subject: Re: [PATCH v5 1/7] arm64: dts: qcom: sc7280: Increase config size to
 256MB for ECAM feature

On 3/11/25 12:13 PM, Konrad Dybcio wrote:
> On 3/9/25 6:45 AM, Krishna Chaitanya Chundru wrote:
>> PCIe ECAM(Enhanced Configuration Access Mechanism) feature requires
>> maximum of 256MB configuration space.
>>
>> To enable this feature increase configuration space size to 256MB. If
>> the config space is increased, the BAR space needs to be truncated as
>> it resides in the same location. To avoid the bar space truncation move
>> config space, DBI, ELBI, iATU to upper PCIe region and use lower PCIe
>> iregion entirely for BAR region.
>>
>> This depends on the commit: '10ba0854c5e6 ("PCI: qcom: Disable mirroring
>> of DBI and iATU register space in BAR region")'
>>
>> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
>> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>> ---
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

I took a second look - why are dbi and config regions overlapping?

I would imagine the latter to be at a certain offset

Konrad