linux-kernel - Re: [PATCH 1/3] ARM: dts: NSP: Add dma-coherent to relevant DT entries

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Date:   Fri, 28 Jul 2017 17:03:39 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jon Mason <jon.mason@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ARM: dts: NSP: Add dma-coherent to relevant DT
 entries

On 07/25/2017 03:06 PM, Jon Mason wrote:
> Cache related issues with DMA rings and performance issues related to
> caching are being caused by not properly setting the "dma-coherent" flag
> in the device tree entries.  Adding it here to correct the issue.
> 
> Signed-off-by: Jon Mason <jon.mason@...adcom.com>
> Fixes: 5fa1026a3e4d ("ARM: dts: NSP: Add PL330 support")
> Fixes: 3107fa5bcfb2 ("ARM: dts: NSP: Add SD/MMC support")
> Fixes: 13d04f20935c ("ARM: dts: NSP: Add AMAC entries")
> Fixes: 5aeda7bf8a1e ("ARM: dts: NSP: Add and enable amac2")
> Fixes: 17d517172300 ("ARM: dts: NSP: Add mailbox (PDC) to NSP")
> Fixes: 1d8ece6639e1 ("ARM: dts: NSP: Add EHCI/OHCI USB nodes to device tree")
> Fixes: bf2289bedef4 ("ARM: dts: NSP: Add Switch Register Access Block node")

The SRAB block is not DMA capable, so this seems a bit superfluous here.

Do you want to submit a patch that omits PL330 for now and adds it
eventually later so I can proceed with applying patches 2 & 3 for this
cycle?


> Fixes: 0f9f27a36d09 ("ARM: dts: NSP: Add I2C support to the DT")
> Fixes: 8dbcad020f2e ("ARM: dts: nsp: Add sata device tree entry")
> Fixes: 522199029fdc ("ARM: dts: NSP: Fix PCIE DT issue")
> ---
>  arch/arm/boot/dts/bcm-nsp.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm-nsp.dtsi b/arch/arm/boot/dts/bcm-nsp.dtsi
> index 7204d1def23d..c8d734d9f5fc 100644
> --- a/arch/arm/boot/dts/bcm-nsp.dtsi
> +++ b/arch/arm/boot/dts/bcm-nsp.dtsi
> @@ -207,6 +207,7 @@
>  			clocks = <&iprocslow>;
>  			clock-names = "apb_pclk";
>  			#dma-cells = <1>;
> +			dma-coherent;
>  		};
>  
>  		sdio: sdhci@...00 {
> @@ -215,6 +216,7 @@
>  			interrupts = <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>;
>  			sdhci,auto-cmd12;
>  			clocks = <&lcpll0 BCM_NSP_LCPLL0_SDIO_CLK>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -224,6 +226,7 @@
>  			      <0x110000 0x1000>;
>  			reg-names = "amac_base", "idm_base";
>  			interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -233,6 +236,7 @@
>  			      <0x111000 0x1000>;
>  			reg-names = "amac_base", "idm_base";
>  			interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -242,6 +246,7 @@
>  			      <0x112000 0x1000>;
>  			reg-names = "amac_base", "idm_base";
>  			interrupts = <GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -252,6 +257,7 @@
>  			#mbox-cells = <1>;
>  			brcm,rx-status-len = <32>;
>  			brcm,use-bcm-hdr;
> +			dma-coherent;
>  		};
>  
>  		nand: nand@...00 {
> @@ -325,6 +331,7 @@
>  			compatible = "generic-ehci";
>  			reg = <0x2a000 0x100>;
>  			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -332,6 +339,7 @@
>  			compatible = "generic-ohci";
>  			reg = <0x2b000 0x100>;
>  			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -364,6 +372,7 @@
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  
> +			dma-coherent;
>  			status = "disabled";
>  
>  			/* ports are defined in board DTS */
> @@ -376,6 +385,7 @@
>  			#size-cells = <0>;
>  			interrupts = <GIC_SPI 89 IRQ_TYPE_NONE>;
>  			clock-frequency = <100000>;
> +			dma-coherent;
>  			status = "disabled";
>  		};
>  
> @@ -446,6 +456,7 @@
>  			interrupts = <GIC_SPI 159 IRQ_TYPE_LEVEL_HIGH>;
>  			#address-cells = <1>;
>  			#size-cells = <0>;
> +			dma-coherent;
>  			status = "disabled";
>  
>  			sata0: sata-port@0 {
> @@ -483,6 +494,7 @@
>  		 */
>  		ranges = <0x82000000 0 0x08000000 0x08000000 0 0x8000000>;
>  
> +		dma-coherent;
>  		status = "disabled";
>  
>  		msi-parent = <&msi0>;
> @@ -519,6 +531,7 @@
>  		 */
>  		ranges = <0x82000000 0 0x40000000 0x40000000 0 0x8000000>;
>  
> +		dma-coherent;
>  		status = "disabled";
>  
>  		msi-parent = <&msi1>;
> @@ -555,6 +568,7 @@
>  		 */
>  		ranges = <0x82000000 0 0x48000000 0x48000000 0 0x8000000>;
>  
> +		dma-coherent;
>  		status = "disabled";
>  
>  		msi-parent = <&msi2>;
> 


-- 
Florian