linux-kernel - Re: [PATCH v2 2/2] PCI: xilinx-cpm: Add support for Versal Net CPM5NC Root Port controller

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Message-ID: <20250214155536.ap7mjvutnuledkki@thinkpad>
Date: Fri, 14 Feb 2025 21:25:36 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Thippeswamy Havalige <thippeswamy.havalige@....com>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	manivannan.sadhasivam@...aro.org, 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 v2 2/2] PCI: xilinx-cpm: Add support for Versal Net
 CPM5NC Root Port controller

On Wed, Feb 12, 2025 at 11:20:59AM +0530, Thippeswamy Havalige wrote:
> The Versal Net ACAP (Adaptive Compute Acceleration Platform) devices
> incorporate the Coherency and PCIe Gen5 Module, specifically the
> 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.
> 
> Currently in this patch Bridge errors support is not added.

s/patch/commit,

> 
> Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
> ---
> Changes in v2:
> - Update commit message.
> ---
>  drivers/pci/controller/pcie-xilinx-cpm.c | 85 ++++++++++++++----------
>  1 file changed, 51 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c
> index 81e8bfae53d0..c26ba662efd7 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,
>  };
>  
>  /**
> @@ -483,31 +484,33 @@ static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
>  	else
>  		dev_info(port->dev, "PCIe Link is DOWN\n");
>  
> -	/* Disable all interrupts */
> -	pcie_write(port, ~XILINX_CPM_PCIE_IDR_ALL_MASK,
> -		   XILINX_CPM_PCIE_REG_IMR);
> -
> -	/* Clear pending interrupts */
> -	pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) &
> -		   XILINX_CPM_PCIE_IMR_ALL_MASK,
> -		   XILINX_CPM_PCIE_REG_IDR);
> -
> -	/*
> -	 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
> -	 * CPM SLCR block.
> -	 */
> -	writel(variant->ir_misc_value,
> -	       port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
> +	if (variant->version != CPM5NC_HOST) {

How about,

	if (variant->version != CPM5NC_HOST)
		return;

Btw, what is the reason to skip these register settings for this controller?
Especially the 'Bridge enable bit'.

> +		/* Disable all interrupts */
> +		pcie_write(port, ~XILINX_CPM_PCIE_IDR_ALL_MASK,
> +			   XILINX_CPM_PCIE_REG_IMR);
> +
> +		/* Clear pending interrupts */
> +		pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_IDR) &
> +			   XILINX_CPM_PCIE_IMR_ALL_MASK,
> +			   XILINX_CPM_PCIE_REG_IDR);
> +
> +		/*
> +		 * XILINX_CPM_PCIE_MISC_IR_ENABLE register is mapped to
> +		 * CPM SLCR block.

Please make use of 80 column width.

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

nit: you don't need braces here.

- Mani

-- 
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