This patch decide proper lowpower mode of either a15 or a9 according to own ID
from Main ID register.

Cc: Arnd Bergmann <a...@arndb.de>
Cc: Marc Zynigier <marc.zyng...@arm.com>
Signed-off-by: Chanwoo Choi <cw00.c...@samsung.com>
Acked-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
 arch/arm/mach-exynos/hotplug.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..acf3119 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,16 +135,21 @@ void __ref exynos_cpu_die(unsigned int cpu)
        int primary_part = 0;
 
        /*
-        * we're ready for shutdown now, so do it.
-        * Exynos4 is A9 based while Exynos5 is A15; check the CPU part
-        * number by reading the Main ID register and then perform the
-        * appropriate sequence for entering low power.
+        * Prepare the CPU for shutting down. The required sequence of
+        * operations depends on core type. CPUID part number can be used to
+        * determine the right way.
         */
-       asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc");
-       if ((primary_part & 0xfff0) == 0xc0f0)
+       primary_part = read_cpuid_part_number();
+
+       switch (primary_part) {
+       case ARM_CPU_PART_CORTEX_A7:
+       case ARM_CPU_PART_CORTEX_A15:
                cpu_enter_lowpower_a15();
-       else
+               break;
+       default:
                cpu_enter_lowpower_a9();
+               break;
+       }
 
        platform_do_lowpower(cpu, &spurious);
 
-- 
1.8.0

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