linux-kernel - Re: [PATCH v2 1/3] PCI: dwc: Fix skipped index 0 in outbound ATU setup

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Message-ID: <aXI8ByG3RlLpIRRa@ryzen>
Date: Thu, 22 Jan 2026 16:02:31 +0100
From: Niklas Cassel <cassel@...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>,
	Frank Li <Frank.Li@....com>,
	Serge Semin <Sergey.Semin@...kalelectronics.ru>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	macro@...am.me.uk, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/3] PCI: dwc: Fix skipped index 0 in outbound ATU
 setup

On Mon, Dec 29, 2025 at 04:12:41PM +0530, Krishna Chaitanya Chundru wrote:
> In dw_pcie_iatu_setup(), the outbound ATU loop uses a pre-increment
> on the index and starts programming from 1, effectively skipping
> index 0. This results in the first outbound window never being
> configured.

This in not true.

outbound iatu at index 0 is used for CFG IOs, see dw_pcie_other_conf_map_bus()
and:
https://github.com/torvalds/linux/blob/v6.19-rc6/drivers/pci/controller/dwc/pcie-designware-host.c#L888


Also see my series here:
https://lore.kernel.org/linux-pci/20260122145411.453291-4-cassel@kernel.org/T/

That tries to clean up this mess.


Kind regards,
Niklas