linux-kernel - Re: [PATCH v3 2/3] iommu: mtk_iommu: Introduce new flag TF_PORT_TO_ADDR

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Date:   Mon, 13 Jun 2022 13:32:28 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     <joro@...tes.org>, <will@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <konrad.dybcio@...ainline.org>, <marijn.suijten@...ainline.org>,
        <martin.botka@...ainline.org>,
        <~postmarketos/upstreaming@...ts.sr.ht>,
        <phone-devel@...r.kernel.org>, <paul.bouchara@...ainline.org>
Subject: Re: [PATCH v3 2/3] iommu: mtk_iommu: Introduce new flag
 TF_PORT_TO_ADDR_MT8173

On Thu, 2022-06-09 at 12:40 +0200, AngeloGioacchino Del Regno wrote:
> In preparation for adding support for MT6795, add a new flag named
> TF_PORT_TO_ADDR_MT8173 and use that instead of checking for m4u_plat
> type in mtk_iommu_hw_init() to avoid seeing a long list of m4u_plat
> checks there in the future.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>

Retitle to: iommu/mediatek: Xxx, then

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

> ---
>  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 0ea0848581e9..8611cf8e4bd5 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -140,6 +140,7 @@
>  #define IFA_IOMMU_PCIE_SUPPORT		BIT(16)
>  /* IOMMU I/O (r/w) is enabled using PERICFG_IOMMU_1 register */
>  #define HAS_PERI_IOMMU1_REG		BIT(17)
> +#define TF_PORT_TO_ADDR_MT8173		BIT(18)
>  
>  #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
>  				((((pdata)->flags) & (mask)) == (_x))
> @@ -960,7 +961,7 @@ static int mtk_iommu_hw_init(const struct
> mtk_iommu_data *data, unsigned int ban
>  	 * Global control settings are in bank0. May re-init these
> global registers
>  	 * since no sure if there is bank0 consumers.
>  	 */
> -	if (data->plat_data->m4u_plat == M4U_MT8173) {
> +	if (MTK_IOMMU_HAS_FLAG(data->plat_data,
> TF_PORT_TO_ADDR_MT8173)) {
>  		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
>  			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
>  	} else {
> @@ -1437,7 +1438,8 @@ static const struct mtk_iommu_plat_data
> mt8167_data = {
>  static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
>  	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
> -			HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM,
> +			HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM |
> +			TF_PORT_TO_ADDR_MT8173,
>  	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
>  	.banks_num    = 1,
>  	.banks_enable = {true},