Re: [PATCH v7 18/21] iommu/mediatek: Fix VLD_PA_RNG register backup when suspend

[Matthias Brugger]

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@xxxxxxxxxxxx>
> Reviewed-by: Evan Green <evgreen@xxxxxxxxxxxx>

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

> ---
>  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 {
>