linux-kernel - Re: [RFC v2 PATCH 0/6] MT8173 IOMMU SUPPORT

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Message-ID: <CABuKBe+3EOx1viFJzXKirY_J9g7ChN+TOZceBvnvff3PdKe7Aw@mail.gmail.com>
Date:	Mon, 18 May 2015 14:09:16 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Yong Wu <yong.wu@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-mediatek@...ts.infradead.org,
	Sasha Hauer <kernel@...gutronix.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	iommu@...ts.linux-foundation.org, Paul Bolle <pebolle@...cali.nl>,
	Arnd Bergmann <arnd@...db.de>, mitchelh@...eaurora.org,
	k.zhang@...iatek.com, youhua.li@...iatek.com
Subject: Re: [RFC v2 PATCH 0/6] MT8173 IOMMU SUPPORT

Hi Yong,

2015-05-15 11:43 GMT+02:00 Yong Wu <yong.wu@...iatek.com>:
>   This patch adds support for m4u(Multimedia Memory Management Unit),
> Currently it only support the m4u with 2 levels of page table on mt8173.
>
>   It is based on Robin Murphy's arm64: IOMMU-backed DMA mapping[1].
>
>   Please check the hardware block diagram of Mediatek IOMMU.
>
>               EMI (External Memory Interface)
>                |
>               m4u (Multimedia Memory Management Unit)
>                |
>               smi (Smart Multimedia Interface)
>                |
>         +---------------+-------
>         |               |
>         |               |
>     vdec larb       disp larb      ... SoCs have different local arbiter(larb).
>         |               |
>         |               |
>    +----+----+    +-----+-----+
>    |    |    |    |     |     |    ...
>    |    |    |    |     |     |    ...
>    |    |    |    |     |     |    ...
>   MC   PP   VLD  OVL0 RDMA0 WDMA0  ... There are different ports in each larb.
>
>   Normally we specify a local arbiter(larb) for each multimedia hardware like
> display, video decode, video encode and camera. And there are different ports in
> each larb. Take a example, there are some ports like MC, PP, UFO, VLD, AVC_MV,
> PRED_RD, PRED_WR in video larb, all the ports are according to the video hardware.
>
>   From the diagram, all the multimedia module connect with m4u via smi.
> SMI is responsible to enable/disable iommu and control the clocks for each local
> arbiter. If we should enable the iommu of video decode, it should config the
> video's ports. And if the video hardware work wether enable/disable iommu,
> it should enable the clock of its larb's clock. So we add a special driver for smi.
>
> [1] http://lists.linuxfoundation.org/pipermail/iommu/2015-February/012236.html
>
> v2:
> -add arm short descriptor support.
> -seperate smi common from smi and change the clock-names according
>  to smi HW.
> -delete the hardcode of the port-names in mt8173.
>  replace this with larb-portes-nr in dtsi.
> -fix some coding style issues.
>
> v1:
> http://lists.infradead.org/pipermail/linux-mediatek/2015-March/000058.html
>
> Yong Wu (6):
>   dt-bindings: iommu: Add binding for mediatek IOMMU
>   dt-bindings: mediatek: Add smi dts binding
>   iommu: add ARM short descriptor page table allocator.
>   iommu/mediatek: Add mt8173 IOMMU driver
>   soc: mediatek: Add SMI driver
>   dts: mt8173: Add iommu/smi nodes for mt8173
>

Some general comments.
It seems that your patches are not based on v4.1.-rc1, can you please
fix this in the next version, they don't apply cleanly.
Please use the checkpatch script before sending the next version, I
had some whitespace errors reported when applying the series.

Thanks,
Matthias

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motzblog.wordpress.com
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