linux-kernel - [PATCH 8/8] MIPS: ingenic: rs90: Add dedicated VRAM memory region

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Message-Id: <20210530171802.23649-9-paul@crapouillou.net>
Date:   Sun, 30 May 2021 18:18:02 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        周琰杰 <zhouyanjie@...yeetech.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, list@...ndingux.net,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 8/8] MIPS: ingenic: rs90: Add dedicated VRAM memory region

Add a 1 MiB memory area dedicated to the video driver. This area will be
managed by Linux' CMA, so that the ingenic-drm driver can be sure to
always be able to allocate contiguous buffers.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 arch/mips/boot/dts/ingenic/rs90.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/rs90.dts b/arch/mips/boot/dts/ingenic/rs90.dts
index 4eb1edbfc155..74fee7f01352 100644
--- a/arch/mips/boot/dts/ingenic/rs90.dts
+++ b/arch/mips/boot/dts/ingenic/rs90.dts
@@ -16,6 +16,18 @@ memory {
 		reg = <0x0 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		vmem: video-memory@...0000 {
+			compatible = "shared-dma-pool";
+			reg = <0x1f00000 0x100000>;
+			reusable;
+		};
+	};
+
 	vcc: regulator {
 		compatible = "regulator-fixed";
 
@@ -300,6 +312,8 @@ &tcu {
 };
 
 &lcd {
+	memory-region = <&vmem>;
+
 	pinctrl-names = "default";
 	pinctrl-0 = <&pins_lcd>;
 };
-- 
2.30.2