diff options
| author | Alexey Brodkin <abrodkin@synopsys.com> | 2016-04-27 16:59:50 +0300 |
|---|---|---|
| committer | Alexey Brodkin <abrodkin@synopsys.com> | 2016-04-29 14:34:13 +0300 |
| commit | cb2ad5e5339c5122166265cea579cc6a356d46de (patch) | |
| tree | bd45a96027bc8f8f1e2e0245bd342978ad03fb7c | |
| parent | 8aeab995fa142523f376369e4ce0608df6727706 (diff) | |
| download | linux-cb2ad5e5339c5122166265cea579cc6a356d46de.tar.xz | |
ARC: [axs10x] Specify reserved memory for frame buffer
Allocation of a frame buffer memory in a special memory region
allows bypassing of so-called IO Coherency aperture
which is typically set as a range 0x8z-0xAz.
I.e. all data traffic to PGU bypasses IO Coherency block
and saves its bandwidth for other peripherals.
Even though for AXS101 (which sorts ARC770 CPU) IOC is not
an option for a sake of keeping one DT description for the
base-board (axs10x_mb.dtsi) we're still defining reserved
memory location in the very end of DDR.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Cc: devicetree@vger.kernel.org
| -rw-r--r-- | arch/arc/boot/dts/axc001.dtsi | 22 | ||||
| -rw-r--r-- | arch/arc/boot/dts/axc003.dtsi | 14 | ||||
| -rw-r--r-- | arch/arc/boot/dts/axc003_idu.dtsi | 14 | ||||
| -rw-r--r-- | arch/arc/boot/dts/axs10x_mb.dtsi | 2 |
4 files changed, 49 insertions, 3 deletions
diff --git a/arch/arc/boot/dts/axc001.dtsi b/arch/arc/boot/dts/axc001.dtsi index 420dcfde289f..262496ac2628 100644 --- a/arch/arc/boot/dts/axc001.dtsi +++ b/arch/arc/boot/dts/axc001.dtsi @@ -93,8 +93,26 @@ memory { #address-cells = <1>; #size-cells = <1>; - ranges = <0x00000000 0x80000000 0x40000000>; + ranges = <0x00000000 0x80000000 0x20000000>; device_type = "memory"; - reg = <0x80000000 0x20000000>; /* 512MiB */ + reg = <0x80000000 0x1b000000>; /* (512 - 32) MiB */ + }; + + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + /* + * We just move frame buffer area to the very end of + * available DDR. And even though in case of ARC770 there's + * no strict requirement for a frame-buffer to be in any + * particular location it allows us to use the same + * base board's DT node for ARC PGU as for ARc HS38. + */ + frame_buffer: frame_buffer@9e000000 { + compatible = "shared-dma-pool"; + reg = <0x9e000000 0x2000000>; + no-map; + }; }; }; diff --git a/arch/arc/boot/dts/axc003.dtsi b/arch/arc/boot/dts/axc003.dtsi index f90fadf7f94e..35ece04d8353 100644 --- a/arch/arc/boot/dts/axc003.dtsi +++ b/arch/arc/boot/dts/axc003.dtsi @@ -100,4 +100,18 @@ device_type = "memory"; reg = <0x80000000 0x20000000>; /* 512MiB */ }; + + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + /* + * Move frame buffer out of IOC aperture (0x8z-0xAz). + */ + frame_buffer: frame_buffer@be000000 { + compatible = "shared-dma-pool"; + reg = <0xbe000000 0x2000000>; + no-map; + }; + }; }; diff --git a/arch/arc/boot/dts/axc003_idu.dtsi b/arch/arc/boot/dts/axc003_idu.dtsi index 06a9f294a2e6..df9ddb623bfe 100644 --- a/arch/arc/boot/dts/axc003_idu.dtsi +++ b/arch/arc/boot/dts/axc003_idu.dtsi @@ -123,4 +123,18 @@ device_type = "memory"; reg = <0x80000000 0x20000000>; /* 512MiB */ }; + + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + /* + * Move frame buffer out of IOC aperture (0x8z-0xAz). + */ + frame_buffer: frame_buffer@be000000 { + compatible = "shared-dma-pool"; + reg = <0xbe000000 0x2000000>; + no-map; + }; + }; }; diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi index 823f15ca68df..64b063d4e996 100644 --- a/arch/arc/boot/dts/axs10x_mb.dtsi +++ b/arch/arc/boot/dts/axs10x_mb.dtsi @@ -283,7 +283,7 @@ encoder-slave = <&adv7511>; clocks = <&pguclk>; clock-names = "pxlclk"; - + memory-region = <&frame_buffer>; port { pgu_output: endpoint { remote-endpoint = <&adv7511_input>; |