linux-kernel - Re: [PATCH 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic using CCI

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Date:   Wed, 10 Feb 2021 22:45:13 +0100
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        bhelgaas@...gle.com
Subject: Re: [PATCH 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic
 using CCI

Hi Bharat,

Thank you for sending the patches over!

> Add support for routing PCIe DMA traffic coherently when
> Cache Coherent Interconnect (CCI) is enabled in the system.
> The "dma-coherent" property is used to determine if CCI is enabled
> or not.
> Refer https://developer.arm.com/documentation/ddi0470/k/preface
> for CCI specification.
[...]

A small nitpick, so feel free to ignore, of course.

Perhaps "Refer to" and "for the CCI", etc.

[...]
> +	/* This routes the PCIe DMA traffic to go through CCI path */
> +	if (of_dma_is_coherent(dev->of_node)) {
> +		nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) |
> +				  CFG_PCIE_CACHE, BRCFG_PCIE_RX1);
> +	}
[...]

A suggestion.

You can drop the curly brackets here if you want to keep the style used
in the kernel, especially for when there is a single statement inside
the code block.

Krzysztof