Hi Daniel,
Thanks for reviewing the patch.
On Tue, Apr 22, 2014 at 8:06 PM, Daniel Lezcano
<daniel.lezcano@xxxxxxxxxx> wrote:
> On 04/22/2014 04:18 PM, Leela Krishna Amudala wrote:
>>
>> Remove the duplicated code for cache disabling and use
>> "v7_exit_coherency_flush"
>> macro to do the same job.
>
>
> Hi Leela,
>
> thanks for this patch! It would be nice if you can describe why those macros
> can be replaced by the generic v7_exit_coherency_flush macro.
>
Okay, will give the description in commit message
>
>>
>> Signed-off-by: Leela Krishna Amudala <leela.krishna@xxxxxxxxxx>
>>
>> ---
>> cpu hotplug is tested with 3.15-rc1 on Origen(which has cortex A9) and
>> Arndale octa(which has cortex A7 and A15) boards.
>>
>> arch/arm/mach-exynos/hotplug.c | 56
>> ++--------------------------------------
>> 1 file changed, 2 insertions(+), 54 deletions(-)
>>
>> diff --git a/arch/arm/mach-exynos/hotplug.c
>> b/arch/arm/mach-exynos/hotplug.c
>> index 5eead53..9eb8d1b 100644
>> --- a/arch/arm/mach-exynos/hotplug.c
>> +++ b/arch/arm/mach-exynos/hotplug.c
>> @@ -24,56 +24,6 @@
>> #include "common.h"
>> #include "regs-pmu.h"
>>
>> -static inline void cpu_enter_lowpower_a9(void)
>> -{
>> - unsigned int v;
>> -
>> - asm volatile(
>> - " mcr p15, 0, %1, c7, c5, 0\n"
>> - " mcr p15, 0, %1, c7, c10, 4\n"
>> - /*
>> - * Turn off coherency
>> - */
>> - " mrc p15, 0, %0, c1, c0, 1\n"
>> - " bic %0, %0, %3\n"
>> - " mcr p15, 0, %0, c1, c0, 1\n"
>> - " mrc p15, 0, %0, c1, c0, 0\n"
>> - " bic %0, %0, %2\n"
>> - " mcr p15, 0, %0, c1, c0, 0\n"
>> - : "=&r" (v)
>> - : "r" (0), "Ir" (CR_C), "Ir" (0x40)
>> - : "cc");
>> -}
>> -
>> -static inline void cpu_enter_lowpower_a15(void)
>> -{
>> - unsigned int v;
>> -
>> - asm volatile(
>> - " mrc p15, 0, %0, c1, c0, 0\n"
>> - " bic %0, %0, %1\n"
>> - " mcr p15, 0, %0, c1, c0, 0\n"
>> - : "=&r" (v)
>> - : "Ir" (CR_C)
>> - : "cc");
>> -
>> - flush_cache_louis();
>> -
>> - asm volatile(
>> - /*
>> - * Turn off coherency
>> - */
>> - " mrc p15, 0, %0, c1, c0, 1\n"
>> - " bic %0, %0, %1\n"
>> - " mcr p15, 0, %0, c1, c0, 1\n"
>> - : "=&r" (v)
>> - : "Ir" (0x40)
>> - : "cc");
>> -
>> - isb();
>> - dsb();
>> -}
>> -
>> static inline void cpu_leave_lowpower(void)
>> {
>> unsigned int v;
>> @@ -141,10 +91,8 @@ void __ref exynos_cpu_die(unsigned int cpu)
>> * appropriate sequence for entering low power.
>> */
>> asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc");
>
>
> Can't you remove this asm line above as well as the primary_part variable ?
Didn't notice it, will remove this.
>
>
>> - if ((primary_part & 0xfff0) == 0xc0f0)
>> - cpu_enter_lowpower_a15();
>> - else
>> - cpu_enter_lowpower_a9();
>> +
>> + v7_exit_coherency_flush(louis);
>>
>> platform_do_lowpower(cpu, &spurious);
>>
>>
>
>
> --
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