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@xxxxxxx>
For the HDLCDs' ones, you can have my Tested-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>.
For the whole thing:
Acked-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
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
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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