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ARM: at91/pm: move the copying the sram function to the sram initialization phase 

To decrease the suspend time, move copying the sram function to the sram
initialization phase, instead of every time go to suspend.

In the meanwhile, substitute fncpy() for memcpy().

If there is no sram allocated for PM, the PM is not supported.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Wenyou Yang 2015-03-09 11:49:01 +08:00 committed by Nicolas Ferre
parent 0ab285c2fa
commit d94e688cae
1 changed files with 12 additions and 4 deletions
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16
arch/arm/mach-at91/pm.c
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@ -29,6 +29,7 @@
#include <linux/atomic.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/fncpy.h>
#include <mach/cpu.h>
#include <mach/hardware.h>
@ -149,9 +150,6 @@ static int at91_pm_enter(suspend_state_t state)
* turning off the main oscillator; reverse on wakeup.
*/
if (slow_clock) {
/* copy slow_clock handler to SRAM, and call it */
memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
slow_clock(at91_pmc_base, at91_ramc_base[0],
at91_ramc_base[1],
at91_pm_data.memctrl);
@ -295,6 +293,13 @@ static void __init at91_pm_sram_init(void)
sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false);
if (!slow_clock) {
pr_warn("SRAM: Could not map\n");
return;
}
/* Copy the slow_clock handler to SRAM */
slow_clock = fncpy(slow_clock, &at91_slow_clock, at91_slow_clock_sz);
}
static void __init at91_pm_init(void)
@ -304,7 +309,10 @@ static void __init at91_pm_init(void)
if (at91_cpuidle_device.dev.platform_data)
platform_device_register(&at91_cpuidle_device);
suspend_set_ops(&at91_pm_ops);
if (slow_clock)
suspend_set_ops(&at91_pm_ops);
else
pr_info("AT91: PM not supported, due to no SRAM allocated\n");
}
void __init at91rm9200_pm_init(void)