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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: Simon Glass <sjg@chromium.org>
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Simon Glass 2011-02-17 08:13:57 -08:00 committed by Colin Cross
parent 1ca00347c5
commit 375b19cd34
1 changed files with 3 additions and 2 deletions
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5
arch/arm/mach-tegra/common.c
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@ -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[] = {