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

[Bjorn Andersson]

On Thu, Nov 13, 2025 at 09:27:36AM +0530, Krishna Chaitanya Chundru wrote:
> 
> On 11/10/2025 11:51 PM, Bjorn Andersson wrote:
> > 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.
> The regression is due to the drivers changes on non qcom platforms.
> 

Please be specific when you're answering, this way of saying "go fish"
isn't helpful.

By investing a little bit more time and writing a single sentence to
share what you know, you could have enlightened me and other readers of
this email list.

Regards,
Bjorn

> - Krishna Chaitanya.
> > 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,