Messages in this thread Patch in this message | | | From | Chanwoo Choi <> | Subject | [PATCH 06/27] ARM: EXYNOS:: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7 | Date | Thu, 10 Apr 2014 18:37:17 +0900 |
| |
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@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> --- 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
| |