linux-kernel - Re: [PATCH v3 2/3] PCI: qcom-ep: Make use of PCIE_SPEED2MBS

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Message-ID: <20230928212757.GA502911@bhelgaas>
Date:   Thu, 28 Sep 2023 16:27:57 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     lpieralisi@...nel.org, kw@...ux.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, bhelgaas@...gle.com,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, abel.vesa@...aro.org
Subject: Re: [PATCH v3 2/3] PCI: qcom-ep: Make use of PCIE_SPEED2MBS_ENC()
 macro for encoding link speed

On Thu, Sep 28, 2023 at 08:48:08PM +0200, Manivannan Sadhasivam wrote:
> On Wed, Sep 27, 2023 at 12:55:42PM -0500, Bjorn Helgaas wrote:
> > On Wed, Sep 27, 2023 at 05:46:02PM +0200, Manivannan Sadhasivam wrote:
> > > Instead of hardcoding the link speed in MBps, let's make use of the
> > > existing PCIE_SPEED2MBS_ENC() macro that does the encoding of the
> > > link speed for us. Also, let's Wrap it with QCOM_PCIE_LINK_SPEED_TO_BW()
> > > macro to do the conversion to ICC speed.

> > > -	ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS));
> > > +	ret = icc_set_bw(pcie_ep->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
> > 
> > "1" is not very informative here.  Maybe PCIE_SPEED_2_5GT?  (I didn't
> > completely verify that this is equivalent.)
> 
> No. PCIE_SPEED_2_5GT is defined as 0x14 in pci.h. And I do not want to add a
> macro for just "1" here.

Is there no other existing macro that contains the 2.5GT/s hint?