linux-kernel - Re: [PATCH] PCI: Fix PCI bridges not to go to D3Hot on older RISC systems

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Message-ID: <f419b6d8a36e43c90e1875da5fb67a7f2a18a219.camel@physik.fu-berlin.de>
Date: Sat, 06 Dec 2025 09:31:42 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: "Maciej W. Rozycki" <macro@...am.me.uk>, René Rebe
	 <rene@...ctco.de>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, Bjorn Helgaas
	 <bhelgaas@...gle.com>, riccardo.mottola@...ero.it
Subject: Re: [PATCH] PCI: Fix PCI bridges not to go to D3Hot on older RISC
 systems

On Sat, 2025-12-06 at 01:07 +0000, Maciej W. Rozycki wrote:
> On Tue, 2 Dec 2025, René Rebe wrote:
> 
> > > Is there actually a justification to restrict the use of D3 to ARM64,
> > > PPC64 and RISCV? What about MIPS, LoongArch or s390x?
> > 
> > Because the ones I picked are more modern, and thus more likely to
> > work. MIPS is very old. [...]
> 
>  How old is "very old?"

I've got two desktop and one embedded Loongson MIPS systems at home (not LoongArch)
and these are very recent (made in the 2020s). The desktop systems already come with
PCI Express slots.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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