linux-kernel - Re: [PATCH v7 18/21] iommu/mediatek: Fix VLD_PA

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Date:   Mon, 17 Jun 2019 18:30:27 +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 18/21] iommu/mediatek: Fix VLD_PA_RNG register backup
 when suspend



On 10/06/2019 14:17, Yong Wu wrote:
> The register VLD_PA_RNG(0x118) was forgot to backup while adding 4GB
> mode support for mt2712. this patch add it.
> 
> Fixes: 30e2fccf9512 ("iommu/mediatek: Enlarge the validate PA range
> for 4GB mode")
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Evan Green <evgreen@...omium.org>

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

> ---
>  drivers/iommu/mtk_iommu.c | 2 ++
>  drivers/iommu/mtk_iommu.h | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 6053b8b..86158d8 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -719,6 +719,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
>  	reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
>  	reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
>  	reg->ivrp_paddr = readl_relaxed(base + REG_MMU_IVRP_PADDR);
> +	reg->vld_pa_rng = readl_relaxed(base + REG_MMU_VLD_PA_RNG);
>  	clk_disable_unprepare(data->bclk);
>  	return 0;
>  }
> @@ -743,6 +744,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  	writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
>  	writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
>  	writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
> +	writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG);
>  	if (m4u_dom)
>  		writel(m4u_dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
>  		       base + REG_MMU_PT_BASE_ADDR);
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index c0b5c65..753266b 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -32,6 +32,7 @@ struct mtk_iommu_suspend_reg {
>  	u32				int_control0;
>  	u32				int_main_control;
>  	u32				ivrp_paddr;
> +	u32				vld_pa_rng;
>  };
>  
>  enum mtk_iommu_plat {
>