linux-kernel - Re: [PATCH v2] PCI: qcom: Make use of QCOM_PCIE_LINK_SPEED_TO

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Date:   Wed, 27 Sep 2023 17:12:55 +0200
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     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,
        abel.vesa@...aro.org
Subject: Re: [PATCH v2] PCI: qcom: Make use of QCOM_PCIE_LINK_SPEED_TO_BW()
 macro for encoding link speed

On Wed, Sep 27, 2023 at 05:06:55PM +0200, Konrad Dybcio wrote:
> On 27.09.2023 16:57, Manivannan Sadhasivam wrote:
> > Instead of hardcoding the link speed in MBps, let's make use of the
> > existing QCOM_PCIE_LINK_SPEED_TO_BW() macro that does the encoding of the
> > link speed for us.
> > 
> > This eliminates the need for a switch case in qcom_pcie_icc_update() and
> > also works for future Gen speeds without any code modifications.
> > 
> > Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> > 
> > Changes in v2:
> > 
> > - Switched to QCOM_PCIE_LINK_SPEED_TO_BW() macro as per Bjorn's suggestion
> >   https://lore.kernel.org/linux-pci/20230924160713.217086-1-manivannan.sadhasivam@linaro.org/
> > 
> >  drivers/pci/controller/dwc/pcie-qcom.c | 24 ++++++------------------
> >  1 file changed, 6 insertions(+), 18 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 297442c969b6..dce80d6dc88f 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -148,6 +148,9 @@
> >  
> >  #define QCOM_PCIE_CRC8_POLYNOMIAL		(BIT(2) | BIT(1) | BIT(0))
> >  
> > +#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \
> > +		MBps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed]) / BITS_PER_BYTE)
> Mbps_to_icc (lowercase b) is precisely that
> 

lol, yeah. I missed it. Let me fix it and also add a patch for -ep driver as
well.

- Mani

> Konrad

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