linux-kernel - Re: [PATCH v3 2/2] PCI: xilinx-cpm: Add support for Versal Net CPM5NC Root Port controller

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Message-ID: <20250224070845.6ocpyblzxk7cviro@thinkpad>
Date: Mon, 24 Feb 2025 12:38:45 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Thippeswamy Havalige <thippeswamy.havalige@....com>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, michal.simek@....com,
	bharat.kumar.gogada@....com
Subject: Re: [PATCH v3 2/2] PCI: xilinx-cpm: Add support for Versal Net
 CPM5NC Root Port controller

On Mon, Feb 17, 2025 at 12:57:13PM +0530, Thippeswamy Havalige wrote:
> The Versal Net ACAP (Adaptive Compute Acceleration Platform) devices
> incorporate the Coherency and PCIe Gen5 Module, specifically the

What do you mean by 'Coherency' here? Cache coherency?

> Next-Generation Compact Module (CPM5NC).
> 
> The integrated CPM5NC block, along with the built-in bridge, can function
> as a PCIe Root Port & supports the PCIe Gen5 protocol with data transfer
> rates of up to 32 GT/s, capable of supporting up to a x16 lane-width
> configuration.
> 
> Bridge errors are managed using a specific interrupt line designed for
> CPM5N. Intx interrupt support is not available.

INTx

> 
> Currently in this commit platform specific Bridge errors support is not
> added.
> 
> Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
> ---
> Changes in v2:
> - Update commit message.
> ---
>  drivers/pci/controller/pcie-xilinx-cpm.c | 48 ++++++++++++++++--------
>  1 file changed, 32 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c
> index 81e8bfae53d0..9b241c665f0a 100644
> --- a/drivers/pci/controller/pcie-xilinx-cpm.c
> +++ b/drivers/pci/controller/pcie-xilinx-cpm.c
> @@ -84,6 +84,7 @@ enum xilinx_cpm_version {
>  	CPM,
>  	CPM5,
>  	CPM5_HOST1,
> +	CPM5NC_HOST,
>  };
>  
>  /**
> @@ -478,6 +479,9 @@ static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
>  {
>  	const struct xilinx_cpm_variant *variant = port->variant;
>  
> +	if (variant->version != CPM5NC_HOST)
> +		return;
> +
>  	if (cpm_pcie_link_up(port))
>  		dev_info(port->dev, "PCIe Link is UP\n");
>  	else
> @@ -493,18 +497,16 @@ static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
>  		   XILINX_CPM_PCIE_REG_IDR);
>  
>  	/*
> -	 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
> -	 * CPM SLCR block.
> +	 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to CPM SLCR block.

Spurious change.

>  	 */
>  	writel(variant->ir_misc_value,
>  	       port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
>  
> -	if (variant->ir_enable) {
> +	if (variant->ir_enable)
>  		writel(XILINX_CPM_PCIE_IR_LOCAL,
>  		       port->cpm_base + variant->ir_enable);
> -	}

Same here. You should not do these kind of the cleanups in this patch as this
patch is supposed to add only CPM5NC support.

>  
> -	/* Set Bridge enable bit */
> +		/* Set Bridge enable bit */

Same here.

Rest LGTM!

- Mani

-- 
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