From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Rob Herring <robh+dt@kernel.org>
Cc: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Hans Verkuil <hverkuil@xs4all.nl>,
nfraprado@collabora.com, linux-media@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
iommu@lists.linux.dev, mingyuan.ma@mediatek.com,
yf.wang@mediatek.com, jianjiao.zeng@mediatek.com,
Yunfei Dong <yunfei.dong@mediatek.com>,
kyrie wu <kyrie.wu@mediatek.corp-partner.google.com>,
chengci.xu@mediatek.com, youlin.pei@mediatek.com,
anan.sun@mediatek.com
Subject: Re: [PATCH v3 08/11] iommu/mediatek: Add a gap for the iova regions
Date: Tue, 14 Feb 2023 10:55:33 +0100 [thread overview]
Message-ID: <5f66275f-5440-38ee-60e7-3b4ea276aae7@collabora.com> (raw)
In-Reply-To: <20230214031114.926-9-yong.wu@mediatek.com>
Il 14/02/23 04:11, Yong Wu ha scritto:
> As the removed property in the vcodec dt-binding, the property is:
> dma-ranges = <0x1 0x0 0x0 0x40000000 0x0 0xfff00000>;
>
> The length is 0xfff0_0000 rather than 0x1_0000_0000, this means it
> requires 1M as a gap. This is because the end address for some vcodec
> HW is (address + size). If the size is 4G, the end address may be
> 0x2_0000_0000, and the width for vcodec register only is 32, then the
> HW may get the ZERO address.
>
> Currently the consumer's dma-ranges property doesn't work, IOMMU
> has to consider this case. Add a bigger gap(8M) for all the regions
> to avoid it.
>
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
next prev parent reply other threads:[~2023-02-14 9:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-14 3:11 [PATCH v3 00/11] Adjust the dma-ranges for MTK IOMMU Yong Wu
2023-02-14 3:11 ` [PATCH v3 01/11] dt-bindings: media: mediatek,vcodec: Remove dma-ranges property Yong Wu
2023-02-14 3:11 ` [PATCH v3 02/11] dt-bindings: media: mediatek,jpeg: " Yong Wu
2023-02-14 3:11 ` [PATCH v3 03/11] iommu/mediatek: Improve comment for the current region/bank Yong Wu
2023-02-14 9:48 ` AngeloGioacchino Del Regno
2023-02-14 3:11 ` [PATCH v3 04/11] iommu/mediatek: Get regionid from larb/port id Yong Wu
2023-02-14 9:07 ` AngeloGioacchino Del Regno
2023-02-14 9:12 ` AngeloGioacchino Del Regno
2023-02-14 3:11 ` [PATCH v3 05/11] iommu/mediatek: mt8195: Add iova_region_larb_msk Yong Wu
2023-02-14 9:36 ` AngeloGioacchino Del Regno
2023-02-14 9:49 ` Yong Wu (吴勇)
2023-02-14 3:11 ` [PATCH v3 06/11] iommu/mediatek: mt8186: " Yong Wu
2023-02-14 9:36 ` AngeloGioacchino Del Regno
2023-02-14 3:11 ` [PATCH v3 07/11] iommu/mediatek: mt8192: " Yong Wu
2023-02-14 3:11 ` [PATCH v3 08/11] iommu/mediatek: Add a gap for the iova regions Yong Wu
2023-02-14 9:55 ` AngeloGioacchino Del Regno [this message]
2023-02-14 3:11 ` [PATCH v3 09/11] arm64: dts: mt8195: Add dma-ranges for the parent "soc" node Yong Wu
2023-02-14 3:11 ` [PATCH v3 10/11] arm64: dts: mt8195: Remove the unnecessary dma-ranges Yong Wu
2023-02-14 3:11 ` [PATCH v3 11/11] arm64: dts: mt8186: Add dma-ranges for the parent "soc" node Yong Wu
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