linux-kernel - Re: [PATCH v7 10/21] iommu/mediatek: Move reset_axi into plat

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Date:   Mon, 17 Jun 2019 12:19:37 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, yingjoe.chen@...iatek.com,
        youlin.pei@...iatek.com, Nicolas Boichat <drinkcat@...omium.org>,
        anan.sun@...iatek.com, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v7 10/21] iommu/mediatek: Move reset_axi into plat_data



On 10/06/2019 14:17, Yong Wu wrote:
> In mt8173 and mt8183, 0x48 is REG_MMU_STANDARD_AXI_MODE while it is
> REG_MMU_CTRL in the other SoCs, and the bits meaning is completely
> different with the REG_MMU_STANDARD_AXI_MODE.
> 
> This patch moves this property to plat_data, it's also a preparing
> patch for mt8183.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Nicolas Boichat <drinkcat@...omium.org>
> Reviewed-by: Evan Green <evgreen@...omium.org>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>  drivers/iommu/mtk_iommu.c | 4 ++--
>  drivers/iommu/mtk_iommu.h | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index d38dfa2..8ac7034 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -557,8 +557,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	}
>  	writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
>  
> -	/* It's MISC control register whose default value is ok except mt8173.*/
> -	if (data->plat_data->m4u_plat == M4U_MT8173)
> +	if (data->plat_data->reset_axi)
>  		writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
>  
>  	if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
> @@ -752,6 +751,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  	.m4u_plat     = M4U_MT8173,
>  	.has_4gb_mode = true,
>  	.has_bclk     = true,
> +	.reset_axi    = true,
>  	.larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
>  };
>  
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index 61fd5d6..55d73c1 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -46,7 +46,7 @@ struct mtk_iommu_plat_data {
>  
>  	/* HW will use the EMI clock if there isn't the "bclk". */
>  	bool                has_bclk;
> -
> +	bool                reset_axi;
>  	unsigned char       larbid_remap[MTK_LARB_NR_MAX];
>  };
>  
>