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>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
arch/arm/mach-exynos/hotplug.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..36d3db6 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,13 +135,20 @@ 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/Exynos7 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)
+
+ /*
+ * Main ID register of Cortex series
+ * - Cortex-a7 : 0x410F_C07x
+ * - Cortex-a15 : 0x410F_C0Fx
+ */
+ primary_part = primary_part & 0xfff0;
+ if (primary_part == 0xc0f0 || primary_part == 0xc070)
cpu_enter_lowpower_a15();
else
cpu_enter_lowpower_a9();
--
1.8.0
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