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References: <20201004055024.23542-1-phil.chang@mediatek.com>
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From:   Chun-Kuang Hu <chunkuang.hu@kernel.org>
Date:   Sun, 4 Oct 2020 21:05:11 +0800
Message-ID: <CAAOTY_8vCb-adkbpdmbTWLeOFt-+dHjr4HVonHX7XPkLkzy1yA@mail.gmail.com>
Subject: Re: [PATCH] [PATCH] of_reserved_mem: Increase the number of reserved regions
To:     Phil Chang <phil.chang@mediatek.com>
Cc:     Linux ARM <linux-arm-kernel@lists.infradead.org>,
        DTML <devicetree@vger.kernel.org>,
        Alix Wu <alix.wu@mediatek.com>,
        YJ Chiang <yj.chiang@mediatek.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Joe Liu <joe.liu@mediatek.com>,
        Frank Rowand <frowand.list@gmail.com>
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Hi, Phil:

Phil Chang <phil.chang@mediatek.com> =E6=96=BC 2020=E5=B9=B410=E6=9C=884=E6=
=97=A5 =E9=80=B1=E6=97=A5 =E4=B8=8B=E5=8D=881:51=E5=AF=AB=E9=81=93=EF=BC=9A
>
> Certain SoCs need to support large amount of reserved memory
> regions, especially to follow the GKI rules from Google.
> In MTK new SoC requires more than 68 regions of reserved memory
> for each IP's usage, such as load firmware to specific sapce,

space

> so that need to reserve more regisions

regions.

I guess this requirement is from Mediatek SoC, but I find below device
tree and just find one reserved memory region,

arch/arm64/boot/dts/mediatek/mt7622.dtsi
arch/arm64/boot/dts/mediatek/mt8173.dtsi
arch/arm64/boot/dts/mediatek/mt8516.dtsi

Could you show me the 68 regions?

Regards,
Chun-Kuang.

>
> Signed-off-by: Joe Liu <joe.liu@mediatek.com>
> Signed-off-by: YJ Chiang <yj.chiang@mediatek.com>
> Signed-off-by: Alix Wu <alix.wu@mediatek.com>
> Signed-off-by: Phil Chang <phil.chang@mediatek.com>
> ---
>  drivers/of/of_reserved_mem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 46b9371c8a33..595f0741dcef 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -22,7 +22,7 @@
>  #include <linux/slab.h>
>  #include <linux/memblock.h>
>
> -#define MAX_RESERVED_REGIONS   64
> +#define MAX_RESERVED_REGIONS   128
>  static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
>  static int reserved_mem_count;
>
> --
> 2.18.0
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