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

[Nícolas F. R. A. Prado]

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@xxxxxxxxxxxx>
> Tested-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
>  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@16000000 {
> +			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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f1ad5338a4d57fe1fe6475003acb8c70bf9d1bdf

> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges = <0 0 0 0x16000000 0 0x26000>;
> +
> +			video-codec-lat@10000 {
> +				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@25000 {
> +				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>;
> +			};
> +		};
> +