arm64: Mark the Applied Micro X-Gene SATA controller as DMA coherent

Since the default DMA ops for arm64 are non-coherent, mark the X-Gene
controller explicitly as dma-coherent to avoid additional cache
maintenance.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Loc Ho <lho@apm.com>

diff --git a/Documentation/devicetree/bindings/ata/apm-xgene.txt b/Documentation/devicetree/bindings/ata/apm-xgene.txt
index 7bcfbf5..a668f0e 100644 (file)
--- a/Documentation/devicetree/bindings/ata/apm-xgene.txt
+++ b/Documentation/devicetree/bindings/ata/apm-xgene.txt
@@ -24,6 +24,7 @@ Required properties:
   * "sata-phy" for the SATA 6.0Gbps PHY
 
 Optional properties:
+- dma-coherent         : Present if dma operations are coherent
 - status               : Shall be "ok" if enabled or "disabled" if disabled.
                          Default is "ok".
 
@@ -55,6 +56,7 @@ Example:
                              <0x0 0x1f22e000 0x0 0x1000>,
                              <0x0 0x1f227000 0x0 0x1000>;
                        interrupts = <0x0 0x87 0x4>;
+                       dma-coherent;
                        status = "ok";
                        clocks = <&sataclk 0>;
                        phys = <&phy2 0>;
@@ -69,6 +71,7 @@ Example:
                              <0x0 0x1f23e000 0x0 0x1000>,
                              <0x0 0x1f237000 0x0 0x1000>;
                        interrupts = <0x0 0x88 0x4>;
+                       dma-coherent;
                        status = "ok";
                        clocks = <&sataclk 0>;
                        phys = <&phy3 0>;

diff --git a/arch/arm64/boot/dts/apm-storm.dtsi b/arch/arm64/boot/dts/apm-storm.dtsi
index 93f4b2d..f8c40a6 100644 (file)
--- a/arch/arm64/boot/dts/apm-storm.dtsi
+++ b/arch/arm64/boot/dts/apm-storm.dtsi
@@ -307,6 +307,7 @@
                              <0x0 0x1f21e000 0x0 0x1000>,
                              <0x0 0x1f217000 0x0 0x1000>;
                        interrupts = <0x0 0x86 0x4>;
+                       dma-coherent;
                        status = "disabled";
                        clocks = <&sata01clk 0>;
                        phys = <&phy1 0>;
@@ -321,6 +322,7 @@
                              <0x0 0x1f22e000 0x0 0x1000>,
                              <0x0 0x1f227000 0x0 0x1000>;
                        interrupts = <0x0 0x87 0x4>;
+                       dma-coherent;
                        status = "ok";
                        clocks = <&sata23clk 0>;
                        phys = <&phy2 0>;
@@ -334,6 +336,7 @@
                              <0x0 0x1f23d000 0x0 0x1000>,
                              <0x0 0x1f23e000 0x0 0x1000>;
                        interrupts = <0x0 0x88 0x4>;
+                       dma-coherent;
                        status = "ok";
                        clocks = <&sata45clk 0>;
                        phys = <&phy3 0>;