linux-kernel - Re: [PATCH v3 2/7] iommu/mediatek: Rename the register STANDARD_AXI_MODE(0x48) to MISC

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Date:   Mon, 25 May 2020 14:11:26 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Chao Hao <chao.hao@...iatek.com>
CC:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <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>, <wsd_upstream@...iatek.com>,
        FY Yang <fy.yang@...iatek.com>, Jun Yan <jun.yan@...iatek.com>
Subject: Re: [PATCH v3 2/7] iommu/mediatek: Rename the register
 STANDARD_AXI_MODE(0x48) to MISC_CTRL

On Sat, 2020-05-09 at 16:36 +0800, Chao Hao wrote:
> For iommu offset=0x48 register, only the previous mt8173/mt8183 use the
> name STANDARD_AXI_MODE, all the latest SoC extend the register more
> feature by different bits, for example: axi_mode, in_order_en, coherent_en
> and so on. So rename REG_MMU_MISC_CTRL may be more proper.
> 
> This patch only rename the register name, no functional change.
> 
> Signed-off-by: Chao Hao <chao.hao@...iatek.com>

Reviewed-by: Yong Wu <yong.wu@...iatek.com>

> ---
>  drivers/iommu/mtk_iommu.c | 14 +++++++-------
>  drivers/iommu/mtk_iommu.h |  2 +-
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 5f4d6df59cf6..e7e7c7695ed1 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -41,7 +41,7 @@
>  #define F_INVLD_EN0				BIT(0)
>  #define F_INVLD_EN1				BIT(1)
>  
> -#define REG_MMU_STANDARD_AXI_MODE		0x048
> +#define REG_MMU_MISC_CTRL			0x048
>  #define REG_MMU_DCM_DIS				0x050
>  
>  #define REG_MMU_CTRL_REG			0x110
> @@ -585,8 +585,10 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	}
>  	writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
>  
> -	if (data->plat_data->reset_axi)
> -		writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
> +	if (data->plat_data->reset_axi) {
> +		/* The register is called STANDARD_AXI_MODE in this case */
> +		writel_relaxed(0, data->base + REG_MMU_MISC_CTRL);
> +	}
>  
>  	if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
>  			     dev_name(data->dev), (void *)data)) {
> @@ -730,8 +732,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
>  	struct mtk_iommu_suspend_reg *reg = &data->reg;
>  	void __iomem *base = data->base;
>  
> -	reg->standard_axi_mode = readl_relaxed(base +
> -					       REG_MMU_STANDARD_AXI_MODE);
> +	reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL);
>  	reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS);
>  	reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
>  	reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
> @@ -755,8 +756,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  		dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret);
>  		return ret;
>  	}
> -	writel_relaxed(reg->standard_axi_mode,
> -		       base + REG_MMU_STANDARD_AXI_MODE);
> +	writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL);
>  	writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
>  	writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
>  	writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index ea949a324e33..1b6ea839b92c 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -18,7 +18,7 @@
>  #include <soc/mediatek/smi.h>
>  
>  struct mtk_iommu_suspend_reg {
> -	u32				standard_axi_mode;
> +	u32				misc_ctrl;
>  	u32				dcm_dis;
>  	u32				ctrl_reg;
>  	u32				int_control0;