linux-kernel - Re: [PATCH v2 09/14] media: mediatek: vcodec: support 36bit iova address

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Message-ID: <c9448af6b22e95df1393203a8f3973dcaf1e4105.camel@collabora.com>
Date: Fri, 28 Nov 2025 15:15:54 -0500
From: Nicolas Dufresne <nicolas.dufresne@...labora.com>
To: Yunfei Dong <yunfei.dong@...iatek.com>, Nícolas "F .
 R . A . Prado" <nfraprado@...labora.com>, Sebastian Fricke
 <sebastian.fricke@...labora.com>, Hans Verkuil	 <hverkuil-cisco@...all.nl>,
 AngeloGioacchino Del Regno	 <angelogioacchino.delregno@...labora.com>,
 Benjamin Gaignard	 <benjamin.gaignard@...labora.com>, Nathan Hebert
 <nhebert@...omium.org>,  Daniel Almeida <daniel.almeida@...labora.com>
Cc: Hsin-Yi Wang <hsinyi@...omium.org>, Fritz Koenig
 <frkoenig@...omium.org>,  Daniel Vetter <daniel@...ll.ch>, Steve Cho
 <stevecho@...omium.org>, linux-media@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 09/14] media: mediatek: vcodec: support 36bit iova
 address

Le vendredi 15 août 2025 à 16:52 +0800, Yunfei Dong a écrit :
> Need to set dma mask to support 36bit iova address for decoder
> hardware can use 36bit address to decode for mt8196.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

> ---
>  .../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c  | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git
> a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
> b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
> index 5e312f86e652..fabf969bc8a9 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
> @@ -388,6 +388,13 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
> +	if (dev->chip_name == MTK_VDEC_MT8196) {
> +		ret = dma_set_mask_and_coherent(&pdev->dev,
> DMA_BIT_MASK(36));
> +		if (ret) {
> +			dev_err(&pdev->dev, "Failed to enable 36-bit DMA:
> %d\n", ret);
> +			return ret;
> +		}
> +	}
>  
>  	dev->fw_handler = mtk_vcodec_fw_select(dev, fw_type, DECODER);
>  	if (IS_ERR(dev->fw_handler))

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