linux-kernel - Re: SiFive FU740 PCI driver fails on 6.18-rc1

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Message-ID: <20251028223859.GA1538617@bhelgaas>
Date: Tue, 28 Oct 2025 17:38:59 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ron Economos <re@...z.net>
Cc: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Conor Dooley <conor@...nel.org>, bhelgaas@...gle.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv <linux-riscv@...ts.infradead.org>,
	Paul Walmsley <pjw@...nel.org>,
	Greentime Hu <greentime.hu@...ive.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	regressions@...ts.linux.dev
Subject: Re: SiFive FU740 PCI driver fails on 6.18-rc1

On Fri, Oct 17, 2025 at 07:21:06AM -0700, Ron Economos wrote:
> On 10/17/25 04:43, Krishna Chaitanya Chundru wrote:
> > On 10/15/2025 7:33 PM, Manivannan Sadhasivam wrote:
> > > On Tue, Oct 14, 2025 at 03:41:39PM -0700, Ron Economos wrote:
> > > > On 10/14/25 09:25, Manivannan Sadhasivam wrote:
> > > > > On Mon, Oct 13, 2025 at 10:52:48PM -0700, Ron Economos wrote:
> > > > > > On 10/13/25 22:36, Krishna Chaitanya Chundru wrote:
> > > > > > > 
> > > > > > > On 10/14/2025 10:56 AM, Ron Economos wrote:
> > > > > > > > On 10/13/25 22:20, Krishna Chaitanya Chundru wrote:
> > > > > > > > > 
> > > > > > > > > On 10/14/2025 2:58 AM, Bjorn Helgaas wrote:
> > > > > > > > > > [+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@...000000
> > > > > > > > > > > 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

> > Can you try with this series and let us know if it is helping you or
> > not.
> > 
> > https://lore.kernel.org/all/20251017-ecam_fix-v1-0-f6faa3d0edf3@oss.qualcomm.com/
> 
> The patch works good. Here's the log of PCI messages.

#regzbot fix: a1978b692a39 ("PCI: dwc: Use custom pci_ops for root bus DBI vs ECAM config access")