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References: <20200221162904.24152-1-ard.biesheuvel@linaro.org>
In-Reply-To: <20200221162904.24152-1-ard.biesheuvel@linaro.org>
From: "Ard Biesheuvel" <ard.biesheuvel@linaro.org>
Date: Fri, 6 Mar 2020 11:39:40 +0100
Message-ID: <CAKv+Gu8vgemNoy89KTtFXWLj7o1pz9hxtH1d6RtcinE+kJiYnA@mail.gmail.com>
Subject: Re: [PATCH edk2-platforms 1/1] Platform/DeveloperBox: drop dma-ranges property from DT root node
To: edk2-devel-groups-io <devel@edk2.groups.io>
Cc: Leif Lindholm <leif@nuviainc.com>
Content-Type: text/plain; charset="UTF-8"

On Fri, 21 Feb 2020 at 17:29, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
>
> The dma-ranges DT property describes the DMA translation between a
> parent bus and its children, and so having a dma-ranges property in
> the root node makes little sense, but it doesn't harm either.
>
> However, recent kernels (v5.5+) have started spewing warnings into
> the kernel log of the following nature:
>
>   OF: translation of DMA address(0) to CPU address failed node(/uart@2a400000)
>   OF: translation of DMA address(0) to CPU address failed node(/pmu)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@70000000)
>   OF: translation of DMA address(0) to CPU address failed node(/uart@51040000)
>   OF: translation of DMA address(0) to CPU address failed node(/gpio@51000000)
>   OF: translation of DMA address(0) to CPU address failed node(/i2c@51210000)
>   OF: translation of DMA address(0) to CPU address failed node(/gpio-keys)
>   OF: translation of DMA address(0) to CPU address failed node(/tpm_tis@10000000)
>   OF: translation of DMA address(0) to CPU address failed node(/sdhci@52300000)
>   OF: translation of DMA address(0) to CPU address failed node(/ethernet@522d0000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>   OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>
> and so we should probably get rid of this bogus dma-ranges property.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> index afb9e2c779df..2ee3821fca0b 100644
> --- a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> +++ b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> @@ -21,7 +21,6 @@
>      #address-cells = <2>;
>      #size-cells = <2>;
>      interrupt-parent = <&gic>;
> -    dma-ranges = <0x0 0x0 0x0 0x0 0x100 0x0>;
>
>      aliases {
>          serial0 = &soc_uart0;
> --
> 2.17.1
>

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