Re: [PATCH v2] PCI: qcom: Block accesses to downstream devices on link down

[Konrad Dybcio]

On 9/1/26 2:35 PM, Manivannan Sadhasivam wrote:
> 
> On Wed, 19 Aug 2026 23:36:54 -0700, Qiang Yu wrote:
>> After a PCIe link goes down, software may still access the BAR (MMIO)
>> space or configuration space of devices behind that link before recovery
>> has run. As the link is down, these accesses never complete, resulting in
>> a storm of Completion Timeout AERs.
>>
>> Use the controller's ECAM blocker to drop these accesses to the PCIe
>> address space as soon as the link-down interrupt fires, so that Completion
>> Timeout AERs are reduced. The blocked range covers the entire address
>> space (base 0x0, all-ones limit), since the Root Port's own DBI/iATU
>> register space remains accessible regardless.
>>
>> [...]
> 
> Applied, thanks!
> 
> [1/1] PCI: qcom: Block accesses to downstream devices on link down
>       commit: 86624b718f94517b26f96c1d7beb7632e5562afd

Could this be a fix for

https://lore.kernel.org/linux-arm-msm/b461c125-947b-4e06-b502-abb354e0cba6@xxxxxxxxxxxxxxxx/

?

(+Xilin)

Konrad