linux-kernel - [PATCH v2 0/2] PCI: dwc: Fix ECAM enablement when used with vendor drivers

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Message-Id: <20251022-ecam_fix-v2-0-e293b9d07262@oss.qualcomm.com>
Date: Wed, 22 Oct 2025 13:21:59 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: 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>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Ron Economos <re@...z.net>
Subject: [PATCH v2 0/2] PCI: dwc: Fix ECAM enablement when used with vendor
 drivers

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>
---
Changes in v2:
- remove bus0 is for root port always(Bjorn)
- Link to v1: https://lore.kernel.org/r/20251017-ecam_fix-v1-0-f6faa3d0edf3@oss.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: 552c50713f273b494ac6c77052032a49bc9255e2
change-id: 20251015-ecam_fix-641d1d5ed71d

Best regards,
-- 
Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>