From: Bjorn Helgaas <helgaas@kernel.org>
To: Ron Economos <re@w6rz.net>
Cc: bhelgaas@google.com, rishna.chundru@oss.qualcomm.com,
mani@kernel.org, helgaas@kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-riscv <linux-riscv@lists.infradead.org>,
Paul Walmsley <pjw@kernel.org>,
Greentime Hu <greentime.hu@sifive.com>,
Samuel Holland <samuel.holland@sifive.com>,
Conor Dooley <conor@kernel.org>,
regressions@lists.linux.dev
Subject: Re: SiFive FU740 PCI driver fails on 6.18-rc1
Date: Mon, 13 Oct 2025 16:28:01 -0500 [thread overview]
Message-ID: <20251013212801.GA865570@bhelgaas> (raw)
In-Reply-To: <eac81c57-1164-4d74-a1b4-6f353c577731@w6rz.net>
[+cc FU740 driver folks, Conor, regressions]
On Mon, Oct 13, 2025 at 12:14:54AM -0700, Ron Economos wrote:
> The SiFive FU740 PCI driver fails on the HiFive Unmatched board with Linux
> 6.18-rc1. The error message is:
>
> [ 3.166624] fu740-pcie e00000000.pcie: host bridge /soc/pcie@e00000000
> ranges:
> [ 3.166706] fu740-pcie e00000000.pcie: IO
> 0x0060080000..0x006008ffff -> 0x0060080000
> [ 3.166767] fu740-pcie e00000000.pcie: MEM
> 0x0060090000..0x007fffffff -> 0x0060090000
> [ 3.166805] fu740-pcie e00000000.pcie: MEM
> 0x2000000000..0x3fffffffff -> 0x2000000000
> [ 3.166950] fu740-pcie e00000000.pcie: ECAM at [mem
> 0xdf0000000-0xdffffffff] for [bus 00-ff]
> [ 3.579500] fu740-pcie e00000000.pcie: No iATU regions found
> [ 3.579552] fu740-pcie e00000000.pcie: Failed to configure iATU in ECAM
> mode
> [ 3.579655] fu740-pcie e00000000.pcie: probe with driver fu740-pcie
> failed with error -22
>
> The normal message (on Linux 6.17.2) is:
>
> [ 3.381487] fu740-pcie e00000000.pcie: host bridge /soc/pcie@e00000000
> ranges:
> [ 3.381584] fu740-pcie e00000000.pcie: IO
> 0x0060080000..0x006008ffff -> 0x0060080000
> [ 3.381682] fu740-pcie e00000000.pcie: MEM
> 0x0060090000..0x007fffffff -> 0x0060090000
> [ 3.381724] fu740-pcie e00000000.pcie: MEM
> 0x2000000000..0x3fffffffff -> 0x2000000000
> [ 3.484809] fu740-pcie e00000000.pcie: iATU: unroll T, 8 ob, 8 ib, align
> 4K, limit 4096G
> [ 3.683678] fu740-pcie e00000000.pcie: PCIe Gen.1 x8 link up
> [ 3.883674] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
> [ 3.987678] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
> [ 3.988164] fu740-pcie e00000000.pcie: PCI host bridge to bus 0000:00
>
> Reverting the following commits solves the issue.
>
> 0da48c5b2fa731b21bc523c82d927399a1e508b0 PCI: dwc: Support ECAM mechanism by
> enabling iATU 'CFG Shift Feature'
>
> 4660e50cf81800f82eeecf743ad1e3e97ab72190 PCI: qcom: Prepare for the DWC ECAM
> enablement
>
> f6fd357f7afbeb34a633e5688a23b9d7eb49d558 PCI: dwc: Prepare the driver for
> enabling ECAM mechanism using iATU 'CFG Shift Feature'
As Conor pointed out, we can't fix a code regression with a DT change.
#regzbot introduced: f6fd357f7afb ("PCI: dwc: Prepare the driver for enabling ECAM mechanism using iATU 'CFG Shift Feature'")
next prev parent reply other threads:[~2025-10-13 21:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-13 7:14 SiFive FU740 PCI driver fails on 6.18-rc1 Ron Economos
2025-10-13 8:19 ` Krishna Chaitanya Chundru
2025-10-13 14:51 ` Conor Dooley
2025-10-13 21:28 ` Bjorn Helgaas [this message]
2025-10-14 5:20 ` Krishna Chaitanya Chundru
2025-10-14 5:26 ` Ron Economos
2025-10-14 5:36 ` Krishna Chaitanya Chundru
2025-10-14 5:52 ` Ron Economos
2025-10-14 16:25 ` Manivannan Sadhasivam
2025-10-14 22:41 ` Ron Economos
2025-10-15 14:03 ` Manivannan Sadhasivam
2025-10-17 11:43 ` Krishna Chaitanya Chundru
2025-10-17 14:21 ` Ron Economos
2025-10-17 15:17 ` Manivannan Sadhasivam
2025-10-28 22:38 ` Bjorn Helgaas
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