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    Subject[PATCH 06/27] ARM: EXYNOS:: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7
    Date
    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


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