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| author | Simon Glass <sjg@chromium.org> | 2011-02-17 08:13:57 -0800 |
|---|---|---|
| committer | Colin Cross <ccross@android.com> | 2011-02-20 20:04:16 -0800 |
| commit | 375b19cd34ea9b1ab338deac20b4bd2c553bf57b (patch) | |
| tree | 3840e91e77936f0620afe76925a98d1c1bcefa92 /arch/arm/mach-tegra/common.c | |
| parent | 1ca00347c579f15b0eea1a6d4bab84e2cf56e745 (diff) | |
| download | kernel_samsung_smdk4412-375b19cd34ea9b1ab338deac20b4bd2c553bf57b.zip kernel_samsung_smdk4412-375b19cd34ea9b1ab338deac20b4bd2c553bf57b.tar.gz kernel_samsung_smdk4412-375b19cd34ea9b1ab338deac20b4bd2c553bf57b.tar.bz2 | |
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>
Diffstat (limited to 'arch/arm/mach-tegra/common.c')
| -rw-r--r-- | arch/arm/mach-tegra/common.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c index 34559d1..54826b8 100644 --- a/arch/arm/mach-tegra/common.c +++ b/arch/arm/mach-tegra/common.c @@ -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[] = { |