Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753256AbcD0Ohw (ORCPT ); Wed, 27 Apr 2016 10:37:52 -0400 Received: from us01smtprelay-2.synopsys.com ([198.182.60.111]:42032 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753175AbcD0Ofa (ORCPT ); Wed, 27 Apr 2016 10:35:30 -0400 From: Alexey Brodkin To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, Alexey Brodkin , devicetree@vger.kernel.org Subject: [PATCH 2/2] ARC: [axs10x] Specify reserved memory for frame buffer Date: Wed, 27 Apr 2016 17:35:01 +0300 Message-Id: <1461767701-12208-3-git-send-email-abrodkin@synopsys.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1461767701-12208-1-git-send-email-abrodkin@synopsys.com> References: <1461767701-12208-1-git-send-email-abrodkin@synopsys.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3326 Lines: 112 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 Cc: devicetree@vger.kernel.org --- arch/arc/boot/dts/axc001.dtsi | 20 +++++++++++++++++++- arch/arc/boot/dts/axc003.dtsi | 14 ++++++++++++++ arch/arc/boot/dts/axc003_idu.dtsi | 14 ++++++++++++++ arch/arc/boot/dts/axs10x_mb.dtsi | 2 +- 4 files changed, 48 insertions(+), 2 deletions(-) diff --git a/arch/arc/boot/dts/axc001.dtsi b/arch/arc/boot/dts/axc001.dtsi index 420dcfd..ae6162d 100644 --- a/arch/arc/boot/dts/axc001.dtsi +++ b/arch/arc/boot/dts/axc001.dtsi @@ -95,6 +95,24 @@ #size-cells = <1>; ranges = <0x00000000 0x80000000 0x40000000>; device_type = "memory"; - reg = <0x80000000 0x20000000>; /* 512MiB */ + reg = <0x80000000 0x1f000000>; /* 512 - 16 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@9f000000 { + compatible = "shared-dma-pool"; + reg = <0x9f000000 0x1000000>; + no-map; + }; }; }; diff --git a/arch/arc/boot/dts/axc003.dtsi b/arch/arc/boot/dts/axc003.dtsi index f90fadf..c7a95c2 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@a0000000 { + compatible = "shared-dma-pool"; + reg = <0xa0000000 0x1000000>; + no-map; + }; + }; }; diff --git a/arch/arc/boot/dts/axc003_idu.dtsi b/arch/arc/boot/dts/axc003_idu.dtsi index 06a9f29..929ec8c 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@a0000000 { + compatible = "shared-dma-pool"; + reg = <0xa0000000 0x1000000>; + no-map; + }; + }; }; diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi index 823f15c..64b063d 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>; -- 2.5.5