Re: [PATCH] arm64: dts: juno: Enable some SMMUs

[Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>]

On Thu, May 18, 2017 at 01:23:36PM +0100, Robin Murphy wrote:
> The IOMMU-backed DMA API support has now been in place for a while and
> proven stable, so there's no real need to keep most of Juno's SMMUs
> disabled. The USB, HDLCDs, and CoreSight ETR all just need to map RAM
> buffers for DMA - enabling their SMMUs obviates CPU bounce buffering for
> USB's streaming DMA to the upper memory bank, and lets the other two
> allocate their relatively large coherent buffers without pressuring CMA.
> 
> Some more software work is still needed for the DMA-330 and PCIe before
> those can accommodate SMMU translation correctly in all cases, so we
> leave those alone for now.
> 
> Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>

For the HDLCDs' ones, you can have my Tested-by: Liviu Dudau <Liviu.Dudau-5wv7dgnIgG8@public.gmane.org>.

For the whole thing:

Acked-by: Liviu Dudau <Liviu.Dudau-5wv7dgnIgG8@public.gmane.org>

Best regards,
Liviu

> ---
>  arch/arm64/boot/dts/arm/juno-base.dtsi | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
> index bfe7d683a42e..02aea43238fc 100644
> --- a/arch/arm64/boot/dts/arm/juno-base.dtsi
> +++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
> @@ -53,7 +53,6 @@
>  		#global-interrupts = <1>;
>  		dma-coherent;
>  		power-domains = <&scpi_devpd 0>;
> -		status = "disabled";
>  	};
>  
>  	gic: interrupt-controller@2c010000 {
> @@ -546,7 +545,6 @@
>  			     <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>;
>  		#iommu-cells = <1>;
>  		#global-interrupts = <1>;
> -		status = "disabled";
>  	};
>  
>  	smmu_hdlcd0: iommu@7fb20000 {
> @@ -556,7 +554,6 @@
>  			     <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
>  		#iommu-cells = <1>;
>  		#global-interrupts = <1>;
> -		status = "disabled";
>  	};
>  
>  	smmu_usb: iommu@7fb30000 {
> @@ -567,7 +564,6 @@
>  		#iommu-cells = <1>;
>  		#global-interrupts = <1>;
>  		dma-coherent;
> -		status = "disabled";
>  	};
>  
>  	dma@7ff00000 {
> -- 
> 2.12.2.dirty
> 

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