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

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Message-ID: <20251017215817.GA1047160@bhelgaas>
Date: Fri, 17 Oct 2025 16:58:17 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
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 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
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.

Bjorn