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Commit 375b19cd authored by Simon Glass's avatar Simon Glass Committed by Colin Cross
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ARM: tegra: Fix hang on reboot 

This seems to be a regression in 2.6.37.

We cannot use writel() here since the resulting wmb() calls l2x0_cache_sync()
which uses a spinlock and L1 cache may be off at this point.

http://lists.infradead.org/pipermail/linux-arm-kernel/2011-February/041909.html



Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
Signed-off-by: default avatarColin Cross <ccross@android.com>
parent 1ca00347

arch/arm/mach-tegra/common.c

+3 −2
Original line number Diff line number Diff line
@@ -39,9 +39,10 @@ void tegra_assert_system_reset(char mode, const char *cmd) 
	void __iomem *reset = IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x04);

	u32 reg;



	reg = readl(reset);

	/* use *_related to avoid spinlock since caches are off */

	reg = readl_relaxed(reset);

	reg |= 0x04;

	writel(reg, reset);

	writel_relaxed(reg, reset);

}



static __initdata struct tegra_clk_init_table common_clk_init_table[] = {