linux-kernel - Re: [PATCH v3 1/4] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature

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Message-ID: <20250124054017.rmrxqa5kyocuf2fi@thinkpad>
Date: Fri, 24 Jan 2025 11:10:17 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: 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>, 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_vpernami@...cinc.com, quic_mrana@...cinc.com,
	mmareddy@...cinc.com,
	Krishna chaitanya chundru <quic_krichai@...cinc.com>
Subject: Re: [PATCH v3 1/4] arm64: dts: qcom: sc7280: Increase config size to
 256MB for ECAM feature

On Tue, Jan 21, 2025 at 02:32:19PM +0530, 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
> region entirely for BAR region.
> 

You also need to mention that this change 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>

- Mani

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