linux-kernel - Re: [PATCH v7 24/25] PCI: bt1: Set 64-bit DMA-mask

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Date:   Fri, 13 Jan 2023 13:04:46 +0100
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Robin Murphy <robin.murphy@....com>
Cc:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Jingoo Han <jingoohan1@...il.com>, Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        caihuoqing <caihuoqing@...du.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 24/25] PCI: bt1: Set 64-bit DMA-mask

On Thu, Dec 15, 2022 at 02:53:04AM +0300, Serge Semin wrote:
> The DW PCIe RC IP-core is synthesized with the 64-bits AXI address bus.
> Since the device is also equipped with the eDMA engine we need to
> explicitly set the device DMA-mask so the DMA-engine clients would be able
> to allocate the data buffers from the DMA-able memory space.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v7:
> - This is a new patch added on v7 stage of the series. (@Robin)
> ---
>  drivers/pci/controller/dwc/pcie-bt1.c | 4 ++++
>  1 file changed, 4 insertions(+)

Hi Robin,

are you OK with this change ? I think that's the last (PCI) bit we
need to take the series.

Thanks,
Lorenzo

> diff --git a/drivers/pci/controller/dwc/pcie-bt1.c b/drivers/pci/controller/dwc/pcie-bt1.c
> index 8b6c7d544d9a..04aa58348aa5 100644
> --- a/drivers/pci/controller/dwc/pcie-bt1.c
> +++ b/drivers/pci/controller/dwc/pcie-bt1.c
> @@ -583,6 +583,10 @@ static int bt1_pcie_add_port(struct bt1_pcie *btpci)
>  	struct device *dev = &btpci->pdev->dev;
>  	int ret;
>  
> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +	if (ret)
> +		return ret;
> +
>  	btpci->dw.version = DW_PCIE_VER_460A;
>  	btpci->dw.dev = dev;
>  	btpci->dw.ops = &bt1_pcie_ops;
> -- 
> 2.38.1
> 
>