From mboxrd@z Thu Jan 1 00:00:00 1970 From: robin.murphy@arm.com (Robin Murphy) Date: Thu, 18 May 2017 13:23:36 +0100 Subject: [PATCH] arm64: dts: juno: Enable some SMMUs Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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 at 2c010000 { @@ -546,7 +545,6 @@ ; #iommu-cells = <1>; #global-interrupts = <1>; - status = "disabled"; }; smmu_hdlcd0: iommu at 7fb20000 { @@ -556,7 +554,6 @@ ; #iommu-cells = <1>; #global-interrupts = <1>; - status = "disabled"; }; smmu_usb: iommu at 7fb30000 { @@ -567,7 +564,6 @@ #iommu-cells = <1>; #global-interrupts = <1>; dma-coherent; - status = "disabled"; }; dma at 7ff00000 { -- 2.12.2.dirty