linux-kernel - Re: [PATCH 0/2] PCI: dwc: Fix ECAM enablement when used with vendor drivers

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Message-ID: <26537629-ec3f-42c5-a1d9-ae0a8566c871@oss.qualcomm.com>
Date: Sat, 18 Oct 2025 14:56:16 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam
 <mani@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Ron Economos <re@...z.net>
Subject: Re: [PATCH 0/2] PCI: dwc: Fix ECAM enablement when used with vendor
 drivers



On 10/18/2025 3:28 AM, Bjorn Helgaas wrote:
> On Fri, Oct 17, 2025 at 05:10:52PM +0530, Krishna Chaitanya Chundru wrote:
>> This series addresses issues with ECAM enablement in the DesignWare PCIe
>> host controller when used with vendor drivers that rely on the DBI base
>> for internal accesses.
>>
>> The first patch fixes the ECAM logic by introducing a custom PCI ops
>> implementation that avoids overwriting the DBI base, ensuring compatibility
>> with vendor drivers that expect a stable DBI address.
>>
>> The second patch reverts Qualcomm-specific ECAM preparation logic that
>> is no longer needed due to the updated design.
>>
>> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
>> ---
>> Krishna Chaitanya Chundru (2):
>>        PCI: dwc: Fix ECAM enablement when used with vendor drivers
>>        PCI: dwc: qcom: Revert "PCI: qcom: Prepare for the DWC ECAM enablement"
>>
>>   drivers/pci/controller/dwc/pcie-designware-host.c | 28 ++++++++--
>>   drivers/pci/controller/dwc/pcie-qcom.c            | 68 -----------------------
>>   2 files changed, 24 insertions(+), 72 deletions(-)
>> ---
>> base-commit: 9b332cece987ee1790b2ed4c989e28162fa47860
>> change-id: 20251015-ecam_fix-641d1d5ed71d
> 
> I hope we can remove the assumption that the root bus is bus 0, but in
Yes we can remove this assumption.
> the meantime I added these to pci/for-linus so we can build and test
> them.
> 
> They're after the pci-v6.18-fixes-2 tag I just asked Linus to pull, so
> they won't be in v6.18-rc2, but should make it for -rc3.
> 
Thanks Bjorn.

- Krishna Chaitanya.
> Bjorn