linux-kernel - Re: [PATCH 09/11] arm64: dts: ls1043a: use a pseudo-bus to constrain usb and sata dma size

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Message-ID: <20220905010921.GQ1728671@dragon>
Date:   Mon, 5 Sep 2022 09:09:21 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Li Yang <leoyang.li@....com>
Cc:     devicetree@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 09/11] arm64: dts: ls1043a: use a pseudo-bus to constrain
 usb and sata dma size

On Wed, Aug 24, 2022 at 05:37:00PM -0500, Li Yang wrote:
> From: Laurentiu Tudor <laurentiu.tudor@....com>
> 
> Wrap the usb and sata controllers in an intermediate simple-bus and use
> it to constrain the dma address size of these usb controllers to the 40
> bits that they generate toward the interconnect.  This is required
> because the SoC uses 48 bits address sizes and this mismatch would lead
> to smmu context faults because the usb generates 40-bit addresses while
> the smmu page tables are populated with 48-bit wide addresses.
> 
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> Signed-off-by: Li Yang <leoyang.li@....com>
> ---
>  .../arm64/boot/dts/freescale/fsl-ls1043a.dtsi | 92 ++++++++++---------
>  1 file changed, 50 insertions(+), 42 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> index 20888aceb5f4..1942ab84ab1c 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> @@ -815,51 +815,59 @@ QORIQ_CLK_PLL_DIV(1)>,
>  					    QORIQ_CLK_PLL_DIV(1)>;
>  		};
>  
> -		usb0: usb@...0000 {
> -			compatible = "snps,dwc3";
> -			reg = <0x0 0x2f00000 0x0 0x10000>;
> -			interrupts = <0 60 0x4>;
> -			dr_mode = "host";
> -			snps,quirk-frame-length-adjustment = <0x20>;
> -			snps,dis_rxdet_inp3_quirk;
> -			usb3-lpm-capable;
> -			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> -			status = "disabled";
> -		};
> +		aux_bus: aux_bus {
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			compatible = "simple-bus";
> +			ranges;
> +			dma-ranges = <0x0 0x0 0x0 0x0 0x100 0x00000000>;
> +
> +			usb0: usb@...0000 {
> +				compatible = "snps,dwc3";
> +				reg = <0x0 0x2f00000 0x0 0x10000>;
> +				interrupts = <0 60 0x4>;

While at it, use define for polarity cell?

Shawn

> +				dr_mode = "host";
> +				snps,quirk-frame-length-adjustment = <0x20>;
> +				snps,dis_rxdet_inp3_quirk;
> +				usb3-lpm-capable;
> +				snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> +				status = "disabled";
> +			};
>  
> -		usb1: usb@...0000 {
> -			compatible = "snps,dwc3";
> -			reg = <0x0 0x3000000 0x0 0x10000>;
> -			interrupts = <0 61 0x4>;
> -			dr_mode = "host";
> -			snps,quirk-frame-length-adjustment = <0x20>;
> -			snps,dis_rxdet_inp3_quirk;
> -			usb3-lpm-capable;
> -			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> -			status = "disabled";
> -		};
> +			usb1: usb@...0000 {
> +				compatible = "snps,dwc3";
> +				reg = <0x0 0x3000000 0x0 0x10000>;
> +				interrupts = <0 61 0x4>;
> +				dr_mode = "host";
> +				snps,quirk-frame-length-adjustment = <0x20>;
> +				snps,dis_rxdet_inp3_quirk;
> +				usb3-lpm-capable;
> +				snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> +				status = "disabled";
> +			};
>  
> -		usb2: usb@...0000 {
> -			compatible = "snps,dwc3";
> -			reg = <0x0 0x3100000 0x0 0x10000>;
> -			interrupts = <0 63 0x4>;
> -			dr_mode = "host";
> -			snps,quirk-frame-length-adjustment = <0x20>;
> -			snps,dis_rxdet_inp3_quirk;
> -			usb3-lpm-capable;
> -			snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> -			status = "disabled";
> -		};
> +			usb2: usb@...0000 {
> +				compatible = "snps,dwc3";
> +				reg = <0x0 0x3100000 0x0 0x10000>;
> +				interrupts = <0 63 0x4>;
> +				dr_mode = "host";
> +				snps,quirk-frame-length-adjustment = <0x20>;
> +				snps,dis_rxdet_inp3_quirk;
> +				usb3-lpm-capable;
> +				snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
> +				status = "disabled";
> +			};
>  
> -		sata: sata@...0000 {
> -			compatible = "fsl,ls1043a-ahci";
> -			reg = <0x0 0x3200000 0x0 0x10000>,
> -				<0x0 0x20140520 0x0 0x4>;
> -			reg-names = "ahci", "sata-ecc";
> -			interrupts = <0 69 0x4>;
> -			clocks = <&clockgen QORIQ_CLK_PLATFORM_PLL
> -					    QORIQ_CLK_PLL_DIV(1)>;
> -			dma-coherent;
> +			sata: sata@...0000 {
> +				compatible = "fsl,ls1043a-ahci";
> +				reg = <0x0 0x3200000 0x0 0x10000>,
> +					<0x0 0x20140520 0x0 0x4>;
> +				reg-names = "ahci", "sata-ecc";
> +				interrupts = <0 69 0x4>;
> +				clocks = <&clockgen QORIQ_CLK_PLATFORM_PLL
> +						    QORIQ_CLK_PLL_DIV(1)>;
> +				dma-coherent;
> +			};
>  		};
>  
>  		msi1: msi-controller1@...1000 {
> -- 
> 2.37.1
>