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

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Date:   Wed, 27 Sep 2023 17:06:55 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        lpieralisi@...nel.org, kw@...ux.com
Cc:     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 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

Konrad