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

From: Bharat Kumar Gogada
Date: Thu Feb 18 2021 - 06:11:25 EST


> 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.
>
Thanks Krzysztof. Will remove it.