Re: (subset) [PATCH v8 0/5] PCI: dwc: Add ECAM support with iATU configuration

[Konrad Dybcio]

On 10/28/25 6:42 PM, Krishna Chaitanya Chundru wrote:
> 
> On 10/28/2025 4:07 AM, Bjorn Andersson wrote:
>> On Thu, 28 Aug 2025 13:04:21 +0530, Krishna Chaitanya Chundru wrote:
>>> The current implementation requires iATU for every configuration
>>> space access which increases latency & cpu utilization.
>>>
>>> Designware databook 5.20a, section 3.10.10.3 says about CFG Shift Feature,
>>> which shifts/maps the BDF (bits [31:16] of the third header DWORD, which
>>> would be matched against the Base and Limit addresses) of the incoming
>>> CfgRd0/CfgWr0 down to bits[27:12]of the translated address.
>>>
>>> [...]
>> Applied, thanks!
>>
>> [1/5] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature
>>        commit: 03e928442d469f7d8dafc549638730647202d9ce
> 
> Hi Bjorn,
> 
> Can you revert this change, this is regression due to this series due to that we have change the logic,
> we need to update the dtsi accordingly, I will send a separate for all controllers to enable this ECAM feature.

I was doing some unrelated work and came across this. The driver
support has been merged a year ago now - let's plumb the missing
pieces.

Konrad