Re: [PATCH 1/6] PCI: of: Avoid config reads for disabled bridge nodes

[Konrad Dybcio]

On 9/1/26 10:47 AM, Xilin Wu wrote:
> The TC9563 PCI power-control driver powers off external downstream ports
> whose device tree nodes have status = "disabled".
> 
> On the Radxa Dragon Q8B, reading the Vendor ID from one of these
> powered-off port functions during PCI enumeration raises an Arm SError
> instead of returning an all-ones PCI error response. This prevents the
> board from completing boot.

I agree with the premise of the patch, but I'd like to understand why
that happens - do you have any details?

Konrad