diff options
| -rw-r--r-- | arch/arm/mach-sunxi/dram_helpers.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/arm/mach-sunxi/dram_helpers.c b/arch/arm/mach-sunxi/dram_helpers.c index 110825b344f..83dbe4ca98f 100644 --- a/arch/arm/mach-sunxi/dram_helpers.c +++ b/arch/arm/mach-sunxi/dram_helpers.c @@ -33,13 +33,25 @@ void mctl_await_completion(u32 *reg, u32 mask, u32 val) #ifndef CONFIG_MACH_SUNIV bool mctl_mem_matches_base(u32 offset, ulong base) { + u32 val_base; + u32 val_offset; + bool ret; + + /* Save original values */ + val_base = readl(base); + val_offset = readl(base + offset); + /* Try to write different values to RAM at two addresses */ writel(0, base); writel(0xaa55aa55, base + offset); dsb(); /* Check if the same value is actually observed when reading back */ - return readl(base) == - readl(base + offset); + ret = readl(base) == readl(base + offset); + + /* Restore original values */ + writel(val_base, base); + writel(val_offset, base + offset); + return ret; } /* |