linux-kernel - Re: [PATCH] PCI: qcom: Add interconnect bandwidth for PCIe Gen4

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Message-ID: <ZRFiD3EXwZI/B8JB@linaro.org>
Date:   Mon, 25 Sep 2023 13:33:51 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        lpieralisi@...nel.org, kw@...ux.com, andersson@...nel.org,
        bhelgaas@...gle.com, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: qcom: Add interconnect bandwidth for PCIe Gen4

On 23-09-25 10:57:47, Konrad Dybcio wrote:
> On 24.09.2023 18:07, Manivannan Sadhasivam wrote:
> > PCIe Gen4 supports the interconnect bandwidth of 1969 MBps. So let's add
> > the bandwidth support in the driver. Otherwise, the default bandwidth of
> > 985 MBps will be used.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/pci/controller/dwc/pcie-qcom.c | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 297442c969b6..6853123f92c1 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -1384,11 +1384,14 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
> >  	case 2:
> >  		bw = MBps_to_icc(500);
> >  		break;
> > +	case 3:
> > +		bw = MBps_to_icc(985);
> > +		break;
> >  	default:
> >  		WARN_ON_ONCE(1);
> >  		fallthrough;
> > -	case 3:
> > -		bw = MBps_to_icc(985);
> > +	case 4:
> > +		bw = MBps_to_icc(1969);
> >  		break;
> Are you adding case 4 under `default`? That looks.. bizzare..

That's intentional. You want it to use 1969MBps if there is a different
gen value. AFAIU.

> 
> Konrad