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authorWenyou Yang <wenyou.yang@atmel.com>2015-03-09 11:49:01 +0800
committerNicolas Ferre <nicolas.ferre@atmel.com>2015-03-13 13:34:22 +0100
commitd94e688cae5661b18164fb7366d1696a1921baba (patch)
tree3b2bb5f408c603fa0142e8af2c8160ac69fb4702 /arch/arm/mach-at91
parent0ab285c2fafe90dfd665b29057666c3953b2592c (diff)
downloadop-kernel-dev-d94e688cae5661b18164fb7366d1696a1921baba.zip
op-kernel-dev-d94e688cae5661b18164fb7366d1696a1921baba.tar.gz
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>
Diffstat (limited to 'arch/arm/mach-at91')
-rw-r--r--arch/arm/mach-at91/pm.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index ea4d888..7cb3a33 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -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)
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