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ARM: OMAP4: PM: Avoid expensive cpu_suspend() path for all CPU power states except off 

Current CPU PM code code make use of common cpu_suspend() path for all the
CPU power states which is not optimal. In fact cpu_suspend() path is needed
only when we put CPU power domain to off state where the CPU context is lost.

Update the code accordingly so that the expensive cpu_suspend() path
can be avoided for the shallow CPU power states like CPU PD INA/CSWR.

The patch has been tested on OMAP4430 and OMAP5430(with few out of tree patches)
devices for suspend and CPUidle.

Cc: Kevin Hilman <khilman@deeprootsystems.com>

Reported-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
This commit is contained in:
Santosh Shilimkar 2013-02-13 14:25:24 +05:30 committed by Kevin Hilman
parent c309f7f461
commit 72433ebada
1 changed files with 4 additions and 1 deletions
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5
arch/arm/mach-omap2/omap-mpuss-lowpower.c
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@ -246,7 +246,10 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
/*
* Call low level function with targeted low power state.
*/
cpu_suspend(save_state, omap4_finish_suspend);
if (save_state)
cpu_suspend(save_state, omap4_finish_suspend);
else
omap4_finish_suspend(save_state);
/*
* Restore the CPUx power state to ON otherwise CPUx