This patch decide proper lowpower mode of either a15 or a9 according to own ID
from Main ID register.
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
arch/arm/mach-exynos/hotplug.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..99e54e0 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,16 +135,22 @@ 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
+ * we're ready for shutdown now, so do it. Exynos4 is A9 based
+ * while Exynos5 is A15/Exynos3 is A7; check the CPU part
* number by reading the Main ID register and then perform the
* appropriate sequence for entering low power.
*/
- 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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