linux-kernel - Re: [PATCH 2/2] iommu/mediatek: add support for MT8167

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Date:   Mon, 6 Jan 2020 11:20:29 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Fabien Parent <fparent@...libre.com>
CC:     <iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <mark.rutland@....com>,
        <matthias.bgg@...il.com>, <joro@...tes.org>, <robh+dt@...nel.org>
Subject: Re: [PATCH 2/2] iommu/mediatek: add support for MT8167

Hi, Fabien:

On Fri, 2020-01-03 at 17:26 +0100, Fabien Parent wrote:
> Add support for the IOMMU on MT8167
> 
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> ---
>  drivers/iommu/mtk_iommu.c | 11 ++++++++++-
>  drivers/iommu/mtk_iommu.h |  1 +
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 6fc1f5ecf91e..5fc6178a82dc 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -569,7 +569,8 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
>  	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
>  
> -	if (data->plat_data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->m4u_plat == M4U_MT8173 ||
> +	    data->plat_data->m4u_plat == M4U_MT8167)

I do not like to use m4u_plat for the variant of each SoC. If you use
m4u_plat, you could drop has_4gb_mode, reset_axi, larbid_remap because
you could use m4u_plat to decide the behavior of these variable but the
code would be so dirty. So I think you should drop m4u_plat and use a
variable to identify this behavior.

Regards,
CK

>  		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
>  	else
>  		regval = lower_32_bits(data->protect_base) |
> @@ -782,6 +783,13 @@ static const struct mtk_iommu_plat_data mt2712_data = {
>  	.larbid_remap = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
>  };
>  
> +static const struct mtk_iommu_plat_data mt8167_data = {
> +	.m4u_plat     = M4U_MT8167,
> +	.has_4gb_mode = true,
> +	.reset_axi    = true,
> +	.larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
> +};
> +
>  static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
>  	.has_4gb_mode = true,
> @@ -798,6 +806,7 @@ static const struct mtk_iommu_plat_data mt8183_data = {
>  
>  static const struct of_device_id mtk_iommu_of_ids[] = {
>  	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
> +	{ .compatible = "mediatek,mt8167-m4u", .data = &mt8167_data},
>  	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
>  	{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
>  	{}
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index ea949a324e33..cb8fd5970cd4 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -30,6 +30,7 @@ struct mtk_iommu_suspend_reg {
>  enum mtk_iommu_plat {
>  	M4U_MT2701,
>  	M4U_MT2712,
> +	M4U_MT8167,
>  	M4U_MT8173,
>  	M4U_MT8183,
>  };