linux-kernel - Re: [PATCH v7 11/14] media: mediatek: vcodec: Remove the setting for dma

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Date:   Wed, 12 Apr 2023 16:34:29 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        nfraprado@...labora.com, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        mingyuan.ma@...iatek.com, yf.wang@...iatek.com,
        jianjiao.zeng@...iatek.com, Yunfei Dong <yunfei.dong@...iatek.com>,
        kyrie wu <kyrie.wu@...iatek.corp-partner.google.com>,
        chengci.xu@...iatek.com, youlin.pei@...iatek.com,
        anan.sun@...iatek.com, Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        irui wang <irui.wang@...iatek.com>
Subject: Re: [PATCH v7 11/14] media: mediatek: vcodec: Remove the setting for
 dma_mask

On 11/04/2023 11:31, Yong Wu wrote:
> In order to simplify the masters to set their respective dma masks, MTK
> IOMMU helps to centralize the processing. Because all the dma ranges is
> set in IOMMU, IOMMU knows well the dma mask requirements of masters. After
> this patch, the masters(codec here) code does not need care
> dma-ranges/dma_mask related information.
> 
> Cc: Tiffany Lin <tiffany.lin@...iatek.com>
> Cc: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> Cc: Yunfei Dong <yunfei.dong@...iatek.com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: irui wang <irui.wang@...iatek.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Acked-by: Hans Verkuil <hverkuil-cisco@...all.nl>

Regards,

	Hans

> ---
>  .../media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c   | 8 --------
>  .../media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c   | 3 ---
>  2 files changed, 11 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> index 174a6eec2f54..11583405cf61 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> @@ -321,14 +321,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL)) {
> -		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
> -		if (ret) {
> -			mtk_v4l2_err("Failed to set mask");
> -			goto err_core_workq;
> -		}
> -	}
> -
>  	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
>  		mutex_init(&dev->dec_mutex[i]);
>  	mutex_init(&dev->dev_mutex);
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> index 9095186d5495..50e5571608cd 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> @@ -344,9 +344,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  		goto err_event_workq;
>  	}
>  
> -	if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL))
> -		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
> -
>  	ret = video_register_device(vfd_enc, VFL_TYPE_VIDEO, -1);
>  	if (ret) {
>  		mtk_v4l2_err("Failed to register video device");