linux-kernel - [PATCH v2 0/3] PCI: dwc: Fix missing iATU setup when ECAM is enabled

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Message-Id: <20251229-ecam_io_fix-v2-0-41a0e56a6faa@oss.qualcomm.com>
Date: Mon, 29 Dec 2025 16:12:40 +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>,
        Frank Li <Frank.Li@....com>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, macro@...am.me.uk,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        stable@...r.kernel.org
Subject: [PATCH v2 0/3] PCI: dwc: Fix missing iATU setup when ECAM is
 enabled

When ECAM is enabled, the driver skipped calling dw_pcie_iatu_setup()
before configuring ECAM iATU entries. This left IO and MEM outbound
windows unprogrammed, resulting in broken IO transactions. Additionally,
dw_pcie_config_ecam_iatu() was only called during host initialization,
so ECAM-related iATU entries were not restored after suspend/resume,
leading to failures in configuration space access.

To resolve these issues, the ECAM iATU configuration is moved into
dw_pcie_setup_rc(). At the same time, dw_pcie_iatu_setup() is invoked
when ECAM is enabled.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
Changes in v2:
- Fixed the index 0 of the ATU window skipping.
- Keep the ob_atu_index in dw_pcie instead of dw_pcie_rp & couple of nitpicks (Bjorn).
- Link to v1: https://lore.kernel.org/r/20251203-ecam_io_fix-v1-0-5cc3d3769c18@oss.qualcomm.com

---
Krishna Chaitanya Chundru (3):
      PCI: dwc: Fix skipped index 0 in outbound ATU setup
      PCI: dwc: Correct iATU index increment for MSG TLP region
      PCI: dwc: Fix missing iATU setup when ECAM is enabled

 drivers/pci/controller/dwc/pcie-designware-host.c | 53 ++++++++++++++---------
 drivers/pci/controller/dwc/pcie-designware.c      |  3 ++
 drivers/pci/controller/dwc/pcie-designware.h      |  2 +-
 3 files changed, 37 insertions(+), 21 deletions(-)
---
base-commit: 3f9f0252130e7dd60d41be0802bf58f6471c691d
change-id: 20251203-ecam_io_fix-6e060fecd3b8

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