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

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Message-ID: <d6a33801-d4fe-40fc-ae19-6a2ce83e5773@oss.qualcomm.com>
Date: Thu, 13 Nov 2025 09:27:36 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>
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 11/10/2025 11:51 PM, Bjorn Andersson wrote:
> 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.
The regression is due to the drivers changes on non qcom platforms.

- Krishna Chaitanya.
> 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,