From: Niklas Cassel <cassel@kernel.org>
To: Xincheng Ji <jixincheng@ultrarisc.com>
Cc: "Jingoo Han" <jingoohan1@gmail.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Xincheng Zhang" <zhangxincheng@ultrarisc.com>,
"Jia Wang" <wangjia@ultrarisc.com>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@oss.qualcomm.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] PCI: dwc: Skip MEM outbound iATU setup for identity mappings
Date: Tue, 20 Oct 2026 11:08:14 +0200 [thread overview]
Message-ID: <atcvfrhVGNIbN6d2@ryzen> (raw)
In-Reply-To: <20261020-dw-pci-fix-v2-1-32b6d62e0edf@ultrarisc.com>
On Tue, Oct 20, 2026 at 10:37:35AM +0800, Xincheng Ji wrote:
> No outbound iATU translation is required when the parent-bus address
> matches the PCI address. This is a DesignWare controller property, not
> an UltraRISC-specific behavior.
>
> Compare the addresses directly and skip MEM outbound iATU setup when
> they match. Remove bypass_ob_mem_iatu and the UltraRISC-specific setting.
> CFG and I/O accesses, as well as non-identity-mapped MEM ranges, still
> use outbound iATU windows.
>
> Fixes: 17b478b29cf1 ("PCI: dwc: Allow drivers to skip MEM outbound iATU setup")
> Fixes: 8da2b970ed4c ("PCI: ultrarisc: Skip MEM outbound iATU setup on DP1000")
> Signed-off-by: Xincheng Ji <jixincheng@ultrarisc.com>
Looks good to me:
Reviewed-by: Niklas Cassel <cassel@kernel.org>
prev parent reply other threads:[~2026-10-20 9:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 2:37 Xincheng Ji
2026-10-20 6:10 ` Shawn Lin
2026-10-20 8:36 ` Koichiro Den
2026-10-20 9:08 ` Niklas Cassel [this message]
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