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

[Maciej W. Rozycki]

On Sat, 6 Dec 2025, René Rebe wrote:

> I love my quirky Sgi MIPS64 Octane and O2 also very much, but fact is: those
> systems had not only special proprietary high speed xbow interconnects, but also
> very glitchy PCI bridges that already barely work to start with.
> 
> Also that just one modern Loongson system might work, does not mean all the
> history of MIPS(64) system will be okay.

 Obviously, but then the individual problematic systems/chips need to be 
blacklisted rather than the whole MIPS port.

> That being said I did not yet found an issue on old x86 systems with the 2015
> Year check removed to d3hot those more than mainstream currently does.

 Well, x86 is special in that the kernel has to interact with the firmware 
(BIOS/ACPI/whatever) that has traditionally had its own quirks even where 
the hardware itself is sane.

  Maciej