linux-kernel - Re: [PATCH v4 2/2] arm64: dts: mt8192: Add vcodec lat and core nodes

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Date:   Mon, 21 Nov 2022 12:30:37 +0000
From:   Allen-KH Cheng (程冠勳) 
        <Allen-KH.Cheng@...iatek.com>
To:     "nfraprado@...labora.com" <nfraprado@...labora.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v4 2/2] arm64: dts: mt8192: Add vcodec lat and core nodes

Hi Nícolas,

On Fri, 2022-11-18 at 09:10 -0500, Nícolas F. R. A. Prado wrote:
> On Fri, Sep 30, 2022 at 07:22:37PM +0800, Allen-KH Cheng wrote:
> > Add vcodec lat and core nodes for mt8192 SoC.
> > 
> > Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
> > Tested-by: Chen-Yu Tsai <wenst@...omium.org>
> > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@...labora.com>
> > ---
> >  arch/arm64/boot/dts/mediatek/mt8192.dtsi | 60
> > ++++++++++++++++++++++++
> >  1 file changed, 60 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > index 6b20376191a7..92a20f87468b 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > @@ -1449,6 +1449,66 @@
> >  			power-domains = <&spm
> > MT8192_POWER_DOMAIN_ISP2>;
> >  		};
> >  
> > +		vcodec_dec: video-codec@...00000 {
> > +			compatible = "mediatek,mt8192-vcodec-dec";
> > +			reg = <0 0x16000000 0 0x1000>;
> > +			mediatek,scp = <&scp>;
> > +			iommus = <&iommu0 M4U_PORT_L4_VDEC_MC_EXT>;
> > +			dma-ranges = <0x1 0x0 0x0 0x40000000 0x0
> > 0xfff00000>;
> 
> Hi,
> 
> since commit 951d48855d86 ("of: Make of_dma_get_range() work on bus
> nodes") [1]
> was merged this no longer works as is. Running the fluster codec
> tests results
> in IOMMU faults:
> 
> 	[  386.233976] mtk-iommu 1401d000.m4u: fault type=0x280
> iova=0x1fcdc0000 pa=0x0 master=0x500041c(larb=4 port=7) layer=0 read
> 	[  386.250666] mtk_vdec_worker(),241:
> [MTK_V4L2][ERROR]  <===[138], src_buf[0] sz=0x298 pts=0
> vdec_if_decode() ret=1 res_chg=0===>
> 
> The issue is that the DMA configuration supplied by dma-ranges is now
> looked for
> in the parent node, so the vcodec_dec node no longer gets the
> configuration it
> expected.
> 
> That said, given that the node already uses the IOMMU for the address
> translations (iommus property), there shouldn't even be a dma-ranges
> property.
> Indeed simply removing the dma-ranges property from this node fixes
> the issue
> and gets the decoder working again.
> 
> Thanks,
> Nícolas
> 
> [1] 
> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f1ad5338a4d57fe1fe6475003acb8c70bf9d1bdf__;!!CTRNKA9wMg0ARbw!xdhhnvXMY5-BjI2BXPHQI-Hw8zgtZ1lvFyFFv7KtNuCDxW17VC7RqAaW9B_uXsQucT1sLk_DUl-c99ijF9dF8QXbJQ$
>  

Noted!

The paret node should be

vcodec_dec: video-codec@...00000 {
	compatible = "mediatek,mt8192-vcodec-dec";
	reg = <0 0x16000000 0 0x1000>;
	mediatek,scp = <&scp>;
	iommus = <&iommu0 M4U_PORT_L4_VDEC_MC_EXT>;
	#address-cells = <2>;
	#size-cells = <2>;
	ranges = <0 0 0 0x16000000 0 0x26000>;
	
	video-codec-lat@...00 {
...

}

Am I right?

Thanks,
Allen

> 
> > +			#address-cells = <2>;
> > +			#size-cells = <2>;
> > +			ranges = <0 0 0 0x16000000 0 0x26000>;
> > +
> > +			video-codec-lat@...00 {
> > +				compatible = "mediatek,mtk-vcodec-lat";
> > +				reg = <0x0 0x10000 0 0x800>;
> > +				interrupts = <GIC_SPI 426
> > IRQ_TYPE_LEVEL_HIGH 0>;
> > +				iommus = <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_VLD_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_VLD2_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_AVC_MV_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_PRED_RD_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_TILE_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_WDMA_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_LAT0_RG_CTRL_DMA_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L5_VDEC_UFO_ENC_EXT>;
> > +				clocks = <&topckgen CLK_TOP_VDEC_SEL>,
> > +					 <&vdecsys_soc
> > CLK_VDEC_SOC_VDEC>,
> > +					 <&vdecsys_soc
> > CLK_VDEC_SOC_LAT>,
> > +					 <&vdecsys_soc
> > CLK_VDEC_SOC_LARB1>,
> > +					 <&topckgen
> > CLK_TOP_MAINPLL_D4>;
> > +				clock-names = "sel", "soc-vdec", "soc-
> > lat", "vdec", "top";
> > +				assigned-clocks = <&topckgen
> > CLK_TOP_VDEC_SEL>;
> > +				assigned-clock-parents = <&topckgen
> > CLK_TOP_MAINPLL_D4>;
> > +				power-domains = <&spm
> > MT8192_POWER_DOMAIN_VDEC>;
> > +			};
> > +
> > +			video-codec-core@...00 {
> > +				compatible = "mediatek,mtk-vcodec-
> > core";
> > +				reg = <0 0x25000 0 0x1000>;
> > +				interrupts = <GIC_SPI 425
> > IRQ_TYPE_LEVEL_HIGH 0>;
> > +				iommus = <&iommu0
> > M4U_PORT_L4_VDEC_MC_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_UFO_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_PP_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_PRED_RD_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_PRED_WR_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_PPWRAP_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_TILE_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_VLD_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_VLD2_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_AVC_MV_EXT>,
> > +					 <&iommu0
> > M4U_PORT_L4_VDEC_RG_CTRL_DMA_EXT>;
> > +				clocks = <&topckgen CLK_TOP_VDEC_SEL>,
> > +					 <&vdecsys CLK_VDEC_VDEC>,
> > +					 <&vdecsys CLK_VDEC_LAT>,
> > +					 <&vdecsys CLK_VDEC_LARB1>,
> > +					 <&topckgen
> > CLK_TOP_MAINPLL_D4>;
> > +				clock-names = "sel", "soc-vdec", "soc-
> > lat", "vdec", "top";
> > +				assigned-clocks = <&topckgen
> > CLK_TOP_VDEC_SEL>;
> > +				assigned-clock-parents = <&topckgen
> > CLK_TOP_MAINPLL_D4>;
> > +				power-domains = <&spm
> > MT8192_POWER_DOMAIN_VDEC2>;
> > +			};
> > +		};
> > +