linux-kernel - Re: [PATCH] arm64: dts: hikey: extend default cma size to 128MB

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Date:   Wed, 24 Aug 2016 10:10:04 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Guodong Xu <guodong.xu@...aro.org>
Cc:     Wei Xu <xuwei5@...ilicon.com>,
        Rob Herring <rob.herring@...aro.org>, fathi.boudra@...aro.org,
        John Stultz <john.stultz@...aro.org>,
        Xinliang Liu <xinliang.liu@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH] arm64: dts: hikey: extend default cma size to 128MB

On Wed, Aug 24, 2016 at 8:35 AM, Guodong Xu <guodong.xu@...aro.org> wrote:
> To support display in Debian on HiKey, cma heap is used to allocate
> graphic buffers. The default size of CMA is 16 MB which is not enought.

s/enought/enough/

>
> Increase the default CMA size to 128 MB.
>
> cc: Rob Herring <rob.herring@...aro.org>
> cc: Fathi Boudra <fathi.boudra@...aro.org>
> cc: John Stultz <john.stultz@...aro.org>
> cc: Xinliang Liu <xinliang.liu@...aro.org>
> Signed-off-by: Guodong Xu <guodong.xu@...aro.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> index 4a51058..abb3434 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> @@ -45,6 +45,20 @@
>                       <0x00000000 0x22000000 0x00000000 0x1c000000>;
>         };
>
> +       reserved-memory {
> +               #address-cells = <2>;
> +               #size-cells = <2>;
> +               ranges;
> +
> +               /* global autoconfigured region for contiguous allocations */
> +               linux,cma {
> +                       compatible = "shared-dma-pool";
> +                       reusable;
> +                       size = <0x00000000 0x08000000>;
> +                       linux,cma-default;
> +               };
> +       };
> +
>         pstore: pstore@...1f00000 {

So what is upstream (as of 4.8) for ramoops also uses reserved-memory,
so you should separately fix this.

Acked-by: Rob Herring <robh@...nel.org>

Rob