linux-kernel - [PATCH v2 27/28] ARM: tegra: enable emc clock updates after lp0

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Date:	Sun, 23 Jan 2011 18:01:32 -0800
From:	Colin Cross <ccross@...roid.com>
To:	linux-tegra@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, olof@...om.net,
	konkers@...roid.com, James Wylder <james.wylder@...orola.com>,
	Colin Cross <ccross@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 27/28] ARM: tegra: enable emc clock updates after lp0

From: James Wylder <james.wylder@...orola.com>

Write a dummy value to EMC_MRW_0 to allow
clock frequency changes after lp0.

Signed-off-by: James Wylder <james.wylder@...orola.com>
Signed-off-by: Colin Cross <ccross@...roid.com>
---
 arch/arm/mach-tegra/suspend.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-tegra/suspend.c b/arch/arm/mach-tegra/suspend.c
index 8b32707..9b851c7 100644
--- a/arch/arm/mach-tegra/suspend.c
+++ b/arch/arm/mach-tegra/suspend.c
@@ -122,6 +122,10 @@ static void __iomem *tmrus = IO_ADDRESS(TEGRA_TMRUS_BASE);
 #define FLOW_CTRL_CPU_CSR	0x8
 #define FLOW_CTRL_CPU1_CSR	0x18
 
+#define EMC_MRW_0		0x0e8
+#define EMC_MRW_DEV_SELECTN     30
+#define EMC_MRW_DEV_NONE	(3 << EMC_MRW_DEV_SELECTN)
+
 unsigned long tegra_pgd_phys;  /* pgd used by hotplug & LP2 bootup */
 static pgd_t *tegra_pgd;
 void *tegra_context_area;
@@ -503,6 +507,7 @@ static void tegra_debug_uart_resume(void)
 static int tegra_suspend_enter(suspend_state_t state)
 {
 	void __iomem *mc = IO_ADDRESS(TEGRA_MC_BASE);
+	void __iomem *emc = IO_ADDRESS(TEGRA_EMC_BASE);
 	unsigned long flags;
 	u32 mc_data[3] = {0, 0, 0};
 	bool do_lp0 = (current_suspend_mode == TEGRA_SUSPEND_LP0);
@@ -555,6 +560,9 @@ static int tegra_suspend_enter(suspend_state_t state)
 		writel(mc_data[1], mc + MC_SECURITY_SIZE);
 		writel(mc_data[2], mc + MC_SECURITY_CFG2);
 
+		/* trigger emc mode write */
+		writel(EMC_MRW_DEV_NONE, emc + EMC_MRW_0);
+
 		tegra_clk_resume();
 		tegra_gpio_resume();
 		tegra_timer_resume();
-- 
1.7.3.1

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