linux-kernel - Re: [PATCH 1/2] PCI: Setup bridge resources earlier

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Message-ID: <8c6b4be3-fec1-4097-9be0-6bd5d352c2e4@gmail.com>
Date: Fri, 17 Oct 2025 23:57:27 +0530
From: Bhanu Seshu Kumar Valluri <bhanuseshukumar@...il.com>
To: ilpo.jarvinen@...ux.intel.com
Cc: bhelgaas@...gle.com, kw@...ux.com, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org, lucas.demarchi@...el.com,
 rafael.j.wysocki@...el.com, Manivannan Sadhasivam <mani@...nel.org>
Subject: Re: [PATCH 1/2] PCI: Setup bridge resources earlier

On 17/10/25 23:52, Bhanu Seshu Kumar Valluri wrote:
> Hi,
> 
> I want to report that this PATCH also break PCI RC port on TI-AM64-EVM.
> 
> I did git bisect and it pointed to the a43ac325c7cb ("PCI: Set up bridge resources earlier")
> 
> Happy to help if any testing or logs are required.
> 
> 
> 
> echo 1 > /sys/bus/pci/rescan
> [   37.170389] pci 0000:01:00.0: [104c:b010] type 00 class 0xff0000 PCIe Endpoint
> [   37.177781] pci 0000:01:00.0: BAR 0 [mem 0x00000000-0x0000ffff]
> [   37.183808] pci 0000:01:00.0: BAR 1 [mem 0x00000000-0x000001ff]
> [   37.189843] pci 0000:01:00.0: BAR 2 [mem 0x00000000-0x000003ff]
> [   37.195802] pci 0000:01:00.0: BAR 3 [mem 0x00000000-0x00003fff]
> [   37.201768] pci 0000:01:00.0: BAR 4 [mem 0x00000000-0x0001ffff]
> [   37.207715] pci 0000:01:00.0: BAR 5 [mem 0x00000000-0x000fffff]
> [   37.214040] pci 0000:01:00.0: supports D1
> [   37.218083] pci 0000:01:00.0: PME# supported from D0 D1 D3hot
> [   37.231890] pci 0000:01:00.0: BAR 5 [mem 0x68100000-0x681fffff]: assigned
> [   37.242890] pci 0000:01:00.0: BAR 4 [mem size 0x00020000]: can't assign; no space
> [   37.251216] pci 0000:01:00.0: BAR 4 [mem size 0x00020000]: failed to assign
> [   37.258309] pci 0000:01:00.0: BAR 0 [mem size 0x00010000]: can't assign; no space
> [   37.265851] pci 0000:01:00.0: BAR 0 [mem size 0x00010000]: failed to assign
> [   37.272896] pci 0000:01:00.0: BAR 3 [mem size 0x00004000]: can't assign; no space
> [   37.280439] pci 0000:01:00.0: BAR 3 [mem size 0x00004000]: failed to assign
> [   37.287459] pci 0000:01:00.0: BAR 2 [mem size 0x00000400]: can't assign; no space
> [   37.294986] pci 0000:01:00.0: BAR 2 [mem size 0x00000400]: failed to assign
> [   37.302011] pci 0000:01:00.0: BAR 1 [mem size 0x00000200]: can't assign; no space
> [   37.309536] pci 0000:01:00.0: BAR 1 [mem size 0x00000200]: failed to assign
> [   37.316595] pci 0000:01:00.0: BAR 5 [mem 0x68100000-0x681fffff]: releasing
> [   37.323541] pci 0000:01:00.0: BAR 5 [mem 0x68100000-0x681fffff]: assigned
> [   37.330400] pci 0000:01:00.0: BAR 4 [mem size 0x00020000]: can't assign; no space
> [   37.337956] pci 0000:01:00.0: BAR 4 [mem size 0x00020000]: failed to assign
> [   37.344960] pci 0000:01:00.0: BAR 0 [mem size 0x00010000]: can't assign; no space
> [   37.352550] pci 0000:01:00.0: BAR 0 [mem size 0x00010000]: failed to assign
> [   37.359578] pci 0000:01:00.0: BAR 3 [mem size 0x00004000]: can't assign; no space
> [   37.367152] pci 0000:01:00.0: BAR 3 [mem size 0x00004000]: failed to assign
> [   37.374192] pci 0000:01:00.0: BAR 2 [mem size 0x00000400]: can't assign; no space
> [   37.381709] pci 0000:01:00.0: BAR 2 [mem size 0x00000400]: failed to assign
> [   37.388720] pci 0000:01:00.0: BAR 1 [mem size 0x00000200]: can't assign; no space
> [   37.396246] pci 0000:01:00.0: BAR 1 [mem size 0x00000200]: failed to assign
> [   37.403795] pcieport 0000:00:00.0: of_irq_parse_pci: failed with rc=-22
> [   37.410513] pci-endpoint-test 0000:01:00.0: enabling device (0000 -> 0002)
> [   37.417796] pci-endpoint-test 0000:01:00.0: Cannot perform PCI test without BAR0
> 

In my setup is pci topology very simple. Just two TI-AM64-EVM directly connected to one another.
One acts as RC and the other is EP.

Regards,
Bhanu Seshu Kumar Valluri