From a38a3c4af4ed72a2ed6192203f8fe17ccdd2389f Mon Sep 17 00:00:00 2001
From: Alexandre Courbot <acourbot@nvidia.com>
Date: Thu, 9 Jul 2015 16:33:01 +0900
Subject: ARM: tegra: enable GPU DT node when appropriate

T124/210 requires some specific configuration (VPR setup) to
be performed by the bootloader before the GPU can be used.
For this reason, the GPU node in the device tree is disabled
by default. This patch enables the node if U-boot has performed
VPR configuration.

Boards enabled by this patch are T124's Jetson TK1 and Venice2
and T210's P2571.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Tom Warren <twarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/arch/arm/include/asm/arch-tegra/gpu.h b/arch/arm/include/asm/arch-tegra/gpu.h
index b347a21..52280f4 100644
--- a/arch/arm/include/asm/arch-tegra/gpu.h
+++ b/arch/arm/include/asm/arch-tegra/gpu.h
@@ -25,3 +25,18 @@ static inline bool gpu_configured(void)
 }
 
 #endif /* CONFIG_TEGRA_GPU */
+
+#if defined(CONFIG_OF_LIBFDT)
+
+int gpu_enable_node(void *blob, const char *gpupath);
+
+#else /* CONFIG_OF_LIBFDT */
+
+static inline int gpu_enable_node(void *blob, const char *gpupath)
+{
+	return 0;
+}
+
+#endif /* CONFIG_OF_LIBFDT */
+
+#endif	/* __ASM_ARCH_TEGRA_GPU_H */
diff --git a/arch/arm/mach-tegra/gpu.c b/arch/arm/mach-tegra/gpu.c
index b2fa50b..4ea046d 100644
--- a/arch/arm/mach-tegra/gpu.c
+++ b/arch/arm/mach-tegra/gpu.c
@@ -45,3 +45,22 @@ bool vpr_configured(void)
 {
 	return _configured;
 }
+
+#if defined(CONFIG_OF_LIBFDT)
+
+int gpu_enable_node(void *blob, const char *gpupath)
+{
+	int offset;
+
+	if (vpr_configured()) {
+		offset = fdt_path_offset(blob, gpupath);
+		if (offset > 0) {
+			fdt_status_okay(blob, offset);
+			debug("enabled GPU node %s\n", gpupath);
+		}
+	}
+
+	return 0;
+}
+
+#endif
diff --git a/board/nvidia/jetson-tk1/jetson-tk1.c b/board/nvidia/jetson-tk1/jetson-tk1.c
index 52425a8..3c21767 100644
--- a/board/nvidia/jetson-tk1/jetson-tk1.c
+++ b/board/nvidia/jetson-tk1/jetson-tk1.c
@@ -11,6 +11,7 @@
 
 #include <asm/arch/gpio.h>
 #include <asm/arch/pinmux.h>
+#include <asm/arch-tegra/gpu.h>
 
 #include "pinmux-config-jetson-tk1.h"
 
@@ -79,3 +80,10 @@ int board_eth_init(bd_t *bis)
 	return pci_eth_init(bis);
 }
 #endif /* PCI */
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	gpu_enable_node(blob, "/gpu@0,57000000");
+
+	return 0;
+}
diff --git a/board/nvidia/p2571/p2571.c b/board/nvidia/p2571/p2571.c
index d80a7d0..d33e4d1 100644
--- a/board/nvidia/p2571/p2571.c
+++ b/board/nvidia/p2571/p2571.c
@@ -11,6 +11,7 @@
 #include <asm/arch/pinmux.h>
 #include <asm/gpio.h>
 #include "max77620_init.h"
+#include <asm/arch-tegra/gpu.h>
 #include "pinmux-config-p2571.h"
 
 void pin_mux_mmc(void)
@@ -61,3 +62,9 @@ void start_cpu_fan(void)
 	gpio_request(GPIO_PE4, "FAN_VDD");
 	gpio_direction_output(GPIO_PE4, 1);
 }
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	gpu_enable_node(blob, "/gpu@0,57000000");
+	return 0;
+}
diff --git a/board/nvidia/venice2/venice2.c b/board/nvidia/venice2/venice2.c
index c56ef12..3e2b9a7 100644
--- a/board/nvidia/venice2/venice2.c
+++ b/board/nvidia/venice2/venice2.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/pinmux.h>
+#include <asm/arch-tegra/gpu.h>
 #include "pinmux-config-venice2.h"
 
 /*
@@ -27,3 +28,10 @@ void pinmux_init(void)
 	pinmux_config_drvgrp_table(venice2_drvgrps,
 				   ARRAY_SIZE(venice2_drvgrps));
 }
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	gpu_enable_node(blob, "/gpu@0,57000000");
+
+	return 0;
+}
diff --git a/include/configs/jetson-tk1.h b/include/configs/jetson-tk1.h
index 55ef5f8..def0ab4 100644
--- a/include/configs/jetson-tk1.h
+++ b/include/configs/jetson-tk1.h
@@ -79,4 +79,6 @@
 #define CONFIG_ARMV7_SECURE_BASE		0xfff00000
 #define CONFIG_ARMV7_SECURE_RESERVE_SIZE	0x00100000
 
+#define CONFIG_OF_BOARD_SETUP
+
 #endif /* __CONFIG_H */
diff --git a/include/configs/p2571.h b/include/configs/p2571.h
index b22117b..54427ad 100644
--- a/include/configs/p2571.h
+++ b/include/configs/p2571.h
@@ -65,5 +65,6 @@
 #include "tegra-common-post.h"
 
 #define COUNTER_FREQUENCY	38400000
+#define CONFIG_OF_BOARD_SETUP
 
 #endif /* _P2571_H */
diff --git a/include/configs/venice2.h b/include/configs/venice2.h
index 2c43f3e..8b1189e 100644
--- a/include/configs/venice2.h
+++ b/include/configs/venice2.h
@@ -61,4 +61,6 @@
 #include "tegra-common-usb-gadget.h"
 #include "tegra-common-post.h"
 
+#define CONFIG_OF_BOARD_SETUP
+
 #endif /* __CONFIG_H */
-- 
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