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ARM: OMAP4: PM: Use custom omap_do_wfi() for default idle.

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Default arch_idle() isn't good enough for OMAP4 because of aync bridge errata
and necessity of NOPs post WFI to avoid speculative prefetch aborts.
Hence Use OMAP4 custom omap_do_wfi() hook for default idle.

Later in the series, async bridge errata work-around patch updates the
omap_do_wfi() with necessary interconnects barriers.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Santosh Shilimkar 2011-07-18 12:25:10 +05:30 committed by Kevin Hilman
parent e97ca477e9
commit 72826b9f88
1 changed files with 21 additions and 0 deletions
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21
arch/arm/mach-omap2/pm44xx.c
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@ -107,6 +107,24 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
}
/**
* omap_default_idle - OMAP4 default ilde routine.'
*
* Implements OMAP4 memory, IO ordering requirements which can't be addressed
* with default arch_idle() hook. Used by all CPUs with !CONFIG_CPUIDLE and
* by secondary CPU with CONFIG_CPUIDLE.
*/
static void omap_default_idle(void)
{
local_irq_disable();
local_fiq_disable();
omap_do_wfi();
local_fiq_enable();
local_irq_enable();
}
/**
* omap4_pm_init - Init routine for OMAP4 PM
*
@ -175,6 +193,9 @@ static int __init omap4_pm_init(void)
suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */
/* Overwrite the default arch_idle() */
pm_idle = omap_default_idle;
err2:
return ret;
}