linux-kernel - Re: [PATCH v8 6/7] PCI: Bring the PCIe speed to MBps logic to new pcie_link_speed_to

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Message-ID: <20240304175136.GD31079@thinkpad>
Date: Mon, 4 Mar 2024 23:21:36 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Brian Masney <bmasney@...hat.com>,
	Georgi Djakov <djakov@...nel.org>, linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, vireshk@...nel.org,
	quic_vbadigan@...cinc.com, quic_skananth@...cinc.com,
	quic_nitegupt@...cinc.com, quic_parass@...cinc.com
Subject: Re: [PATCH v8 6/7] PCI: Bring the PCIe speed to MBps logic to new
 pcie_link_speed_to_mbps()

On Sat, Mar 02, 2024 at 09:30:00AM +0530, Krishna chaitanya chundru wrote:
> Bring the switch case in pcie_link_speed_mbps() to new function to
> the header file so that it can be used in other places like
> in controller driver.
> 

Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>

> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/pci/pci.c | 19 +------------------
>  drivers/pci/pci.h | 22 ++++++++++++++++++++++
>  2 files changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index d8f11a078924..b441ab862a8d 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -6309,24 +6309,7 @@ int pcie_link_speed_mbps(struct pci_dev *pdev)
>  	if (err)
>  		return err;
>  
> -	switch (to_pcie_link_speed(lnksta)) {
> -	case PCIE_SPEED_2_5GT:
> -		return 2500;
> -	case PCIE_SPEED_5_0GT:
> -		return 5000;
> -	case PCIE_SPEED_8_0GT:
> -		return 8000;
> -	case PCIE_SPEED_16_0GT:
> -		return 16000;
> -	case PCIE_SPEED_32_0GT:
> -		return 32000;
> -	case PCIE_SPEED_64_0GT:
> -		return 64000;
> -	default:
> -		break;
> -	}
> -
> -	return -EINVAL;
> +	return pcie_link_speed_to_mbps(to_pcie_link_speed(lnksta));
>  }
>  EXPORT_SYMBOL(pcie_link_speed_mbps);
>  
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 2336a8d1edab..40403783229f 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -282,6 +282,28 @@ void pci_bus_put(struct pci_bus *bus);
>  	 (speed) == PCIE_SPEED_2_5GT  ?  2500*8/10 : \
>  	 0)
>  
> +static inline int pcie_link_speed_to_mbps(enum pci_bus_speed speed)
> +{
> +	switch (speed) {
> +	case PCIE_SPEED_2_5GT:
> +		return 2500;
> +	case PCIE_SPEED_5_0GT:
> +		return 5000;
> +	case PCIE_SPEED_8_0GT:
> +		return 8000;
> +	case PCIE_SPEED_16_0GT:
> +		return 16000;
> +	case PCIE_SPEED_32_0GT:
> +		return 32000;
> +	case PCIE_SPEED_64_0GT:
> +		return 64000;
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
>  const char *pci_speed_string(enum pci_bus_speed speed);
>  enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev);
>  enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev);
> 
> -- 
> 2.42.0
> 

-- 
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