linux-kernel - Re: [PATCH v5 2/3] iommu/mediatek: Introduce new flag TF_PORT_TO_ADDR

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Date:   Tue, 13 Sep 2022 16:00:18 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, joro@...tes.org
Cc:     yong.wu@...iatek.com, 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 v5 2/3] iommu/mediatek: Introduce new flag
 TF_PORT_TO_ADDR_MT8173

On 13/09/2022 14:24, 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>
> Reviewed-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  drivers/iommu/mtk_iommu.c | 6 ++++--
>  drivers/memory/mtk-smi.c  | 1 +
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 7e363b1f24df..b511359376f4 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -138,6 +138,7 @@
>  #define PM_CLK_AO			BIT(15)
>  #define IFA_IOMMU_PCIE_SUPPORT		BIT(16)
>  #define PGTABLE_PA_35_EN		BIT(17)
> +#define TF_PORT_TO_ADDR_MT8173		BIT(18)
>  
>  #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
>  				((((pdata)->flags) & (mask)) == (_x))
> @@ -955,7 +956,7 @@ 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 {
> @@ -1427,7 +1428,8 @@ 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},
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 5a9754442bc7..cd415ed1f4ca 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -462,6 +462,7 @@ static int mtk_smi_larb_sleep_ctrl_enable(struct mtk_smi_larb *larb)
>  	if (ret) {
>  		/* TODO: Reset this larb if it fails here. */
>  		dev_err(larb->smi.dev, "sleep ctrl is not ready(0x%x).\n", tmp);
> +		ret = -EAGAIN;

Doesn't look related nor explained in commit msg.


Best regards,
Krzysztof