linux-kernel - Re: (subset) [PATCH v8 0/5] PCI: dwc: Add ECAM support with iATU configuration

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Message-ID: <zovd3p46jmyitqyr5obsvvmxj3sa3lcaczmnv4iskhos44klhk@gk6c55ndeklr>
Date: Mon, 10 Nov 2025 12:21:43 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: cros-qcom-dts-watchers@...omium.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>, Manivannan Sadhasivam <mani@...nel.org>, 
	Krzysztof Wilczyński <kwilczynski@...nel.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_mrana@...cinc.com, quic_vpernami@...cinc.com, mmareddy@...cinc.com, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: (subset) [PATCH v8 0/5] PCI: dwc: Add ECAM support with iATU
 configuration

On Tue, Oct 28, 2025 at 11:12:23PM +0530, Krishna Chaitanya Chundru wrote:
> 
> On 10/28/2025 4:07 AM, Bjorn Andersson wrote:
> > On Thu, 28 Aug 2025 13:04:21 +0530, Krishna Chaitanya Chundru wrote:
> > > The current implementation requires iATU for every configuration
> > > space access which increases latency & cpu utilization.
> > > 
> > > Designware databook 5.20a, section 3.10.10.3 says about CFG Shift Feature,
> > > which shifts/maps the BDF (bits [31:16] of the third header DWORD, which
> > > would be matched against the Base and Limit addresses) of the incoming
> > > CfgRd0/CfgWr0 down to bits[27:12]of the translated address.
> > > 
> > > [...]
> > Applied, thanks!
> > 
> > [1/5] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature
> >        commit: 03e928442d469f7d8dafc549638730647202d9ce
> 
> Hi Bjorn,
> 
> Can you revert this change, this is regression due to this series due to
> that we have change the logic,

How is that possible? This is patch 1 in the series, by definition it
doesn't have any outstanding dependencies.


I've reverted the change.

Regards,
Bjorn

> we need to update the dtsi accordingly, I will send a separate for all
> controllers to enable this ECAM feature.
> 
> - Krishna Chaitanya.
> 
> 
> > Best regards,