linux-kernel - Re: [PATCH v3] iommu/mediatek: Set dma_mask for PGTABLE_PA_35

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Date:   Thu, 16 Mar 2023 11:24:18 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        iommu@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
        Yunfei Wang <yf.wang@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        jianjiao.zeng@...iatek.com, chengci.xu@...iatek.com
Subject: Re: [PATCH v3] iommu/mediatek: Set dma_mask for PGTABLE_PA_35_EN

Il 16/03/23 11:14, Yong Wu ha scritto:
> When we enable PGTABLE_PA_35_EN, the PA for pgtable may be 35bits.
> Thus add dma_mask for it.
> 
> Fixes: 301c3ca12576 ("iommu/mediatek: Allow page table PA up to 35bit")
> Signed-off-by: Chengci.Xu <chengci.xu@...iatek.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> v3: Sorry for a typo. Change from "if (!ret)" to "if (ret)".

I was just about to make you notice. Glad you've fixed that promptly and before
giving me a chance to complain! :-P

Good job!

Cheers,
Angelo

> 
> v2: Just move this out from mt8188 series. Nothing change.
> 
> v1: https://lore.kernel.org/linux-mediatek/20230307080555.14399-3-yong.wu@mediatek.com/
> ---
>   drivers/iommu/mtk_iommu.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index d5a4955910ff..6a00ce208dc2 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -1258,6 +1258,14 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>   			return PTR_ERR(data->bclk);
>   	}
>   
> +	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN)) {
> +		ret = dma_set_mask(dev, DMA_BIT_MASK(35));
> +		if (ret) {
> +			dev_err(dev, "Failed to set dma_mask 35.\n");
> +			return ret;
> +		}
> +	}
> +
>   	pm_runtime_enable(dev);
>   
>   	if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {