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

[Bjorn Andersson]

On Tue, Oct 28, 2025 at 11:12:23PM +0530, 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,

How is that possible? This is patch 1 in the series, by definition it
doesn't have any outstanding dependencies.


I've reverted the change.

Regards,
Bjorn

> we need to update the dtsi accordingly, I will send a separate for all
> controllers to enable this ECAM feature.
> 
> - Krishna Chaitanya.
> 
> 
> > Best regards,