Messages in this thread Patch in this message |  | | From | Wenyou Yang <> | Subject | [PATCH 1/3] pm: at91: pm_suspend: add the WFI instruction support for ARMv7 | Date | Thu, 12 Feb 2015 10:51:26 +0800 |
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Add the WFI instruction to make the cpu to the idle state. In the meanwhile, disable the processor's clock.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> --- arch/arm/mach-at91/pm_suspend.S | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S index bebe3de..1c7256a 100644 --- a/arch/arm/mach-at91/pm_suspend.S +++ b/arch/arm/mach-at91/pm_suspend.S @@ -51,6 +51,24 @@ tmp2 .req r5 beq 1b .endm +/* + * Put the processor to enter the idle state + */ + .macro at91_cpu_idle + +#if defined(CONFIG_CPU_V7) + mov tmp1, #AT91_PMC_PCK + str tmp1, [pmc, #AT91_PMC_SCDR] + + dsb + + wfi @ Wait For Interrupt +#else + mcr p15, 0, tmp1, c7, c0, 4 +#endif + + .endm + .text /* @@ -120,7 +138,7 @@ skip_disable_main_clock: ldr pmc, .pmc_base /* Wait for interrupt */ - mcr p15, 0, tmp1, c7, c0, 4 + at91_cpu_idle ldr r0, .pm_mode tst r0, #AT91_PM_SLOW_CLOCK -- 1.7.9.5
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