linux-kernel - Re: [PATCH v4 2/3] iommu/mediatek: add flag for legacy ivrp paddr

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Message-ID: <cac92e0d-0789-64a4-729c-80ff5f34b6bb@gmail.com>
Date:   Mon, 14 Sep 2020 11:19:26 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Fabien Parent <fparent@...libre.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
Cc:     joro@...tes.org, robh+dt@...nel.org, yong.wu@...iatek.com,
        miles.chen@...iatek.com
Subject: Re: [PATCH v4 2/3] iommu/mediatek: add flag for legacy ivrp paddr



On 07/09/2020 12:16, Fabien Parent wrote:
> Add a new flag in order to select which IVRP_PADDR format is used
> by an SoC.
> 
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> Reviewed-by: Yong Wu <yong.wu@...iatek.com>

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

> ---
> 
> v4: no change
> v3: set LEGACY_IVRP_PADDR as a flag instead of platform data
> v2: new patch
> 
> ---
>   drivers/iommu/mtk_iommu.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 785b228d39a6..b1f85a7e9346 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -116,6 +116,7 @@
>   #define OUT_ORDER_WR_EN			BIT(4)
>   #define HAS_SUB_COMM			BIT(5)
>   #define WR_THROT_EN			BIT(6)
> +#define HAS_LEGACY_IVRP_PADDR		BIT(7)
>   
>   #define MTK_IOMMU_HAS_FLAG(pdata, _x) \
>   		((((pdata)->flags) & (_x)) == (_x))
> @@ -582,7 +583,7 @@ 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 (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR))
>   		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
>   	else
>   		regval = lower_32_bits(data->protect_base) |
> @@ -818,7 +819,8 @@ static const struct mtk_iommu_plat_data mt6779_data = {
>   
>   static const struct mtk_iommu_plat_data mt8173_data = {
>   	.m4u_plat     = M4U_MT8173,
> -	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI,
> +	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
> +			HAS_LEGACY_IVRP_PADDR,
>   	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
>   	.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
>   };
>