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[ARM] pxa: skip registers saving/restoring if entering standby mode 

registers are retained during standby mode, thus it's not necessary
to save/restore and checksum

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
eric miao 2008-01-14 15:50:54 +08:00 committed by Russell King
parent dd01b2fc79
commit 512f03fdae
1 changed files with 18 additions and 15 deletions
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33
arch/arm/mach-pxa/pm.c
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@ -38,34 +38,37 @@ int pxa_pm_enter(suspend_state_t state)
iwmmxt_task_disable(NULL);
#endif
pxa_cpu_pm_fns->save(sleep_save);
/* skip registers saving for standby */
if (state != PM_SUSPEND_STANDBY) {
pxa_cpu_pm_fns->save(sleep_save);
/* before sleeping, calculate and save a checksum */
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
sleep_save_checksum += sleep_save[i];
}
/* Clear sleep reset status */
RCSR = RCSR_SMR;
/* before sleeping, calculate and save a checksum */
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
sleep_save_checksum += sleep_save[i];
/* *** go zzz *** */
pxa_cpu_pm_fns->enter(state);
cpu_init();
/* after sleeping, validate the checksum */
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
checksum += sleep_save[i];
if (state != PM_SUSPEND_STANDBY) {
/* after sleeping, validate the checksum */
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
checksum += sleep_save[i];
/* if invalid, display message and wait for a hardware reset */
if (checksum != sleep_save_checksum) {
/* if invalid, display message and wait for a hardware reset */
if (checksum != sleep_save_checksum) {
#ifdef CONFIG_ARCH_LUBBOCK
LUB_HEXLED = 0xbadbadc5;
LUB_HEXLED = 0xbadbadc5;
#endif
while (1)
pxa_cpu_pm_fns->enter(state);
while (1)
pxa_cpu_pm_fns->enter(state);
}
pxa_cpu_pm_fns->restore(sleep_save);
}
pxa_cpu_pm_fns->restore(sleep_save);
pr_debug("*** made it back from resume\n");
return 0;