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| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2010-06-16 20:49:48 +0400 |
|---|---|---|
| committer | Kevin Hilman <khilman@ti.com> | 2011-12-08 23:29:00 +0400 |
| commit | b5b4f2881f619460fdb165111bac10a3dd8eebee (patch) | |
| tree | 2f41f00e91f11ef77ff47dd0f65fc31b67aeb9c7 /arch/arm/mach-omap2/omap-mpuss-lowpower.c | |
| parent | a6e48358d15fec2f3f9e86a6d6fc62422141a3a9 (diff) | |
| download | linux-b5b4f2881f619460fdb165111bac10a3dd8eebee.tar.xz | |
ARM: OMAP4: PM: Program CPU1 to hit OFF when off-lined
Program non-boot CPUs to hit lowest supported power state
when it is off-lined using cpu hotplug framework.
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>
Diffstat (limited to 'arch/arm/mach-omap2/omap-mpuss-lowpower.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap-mpuss-lowpower.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c index 867fee51e42c..9c1c12b8c5e1 100644 --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c @@ -192,6 +192,38 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state) return 0; } +/** + * omap4_hotplug_cpu: OMAP4 CPU hotplug entry + * @cpu : CPU ID + * @power_state: CPU low power state. + */ +int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state) +{ + unsigned int cpu_state = 0; + + if (omap_rev() == OMAP4430_REV_ES1_0) + return -ENXIO; + + if (power_state == PWRDM_POWER_OFF) + cpu_state = 1; + + clear_cpu_prev_pwrst(cpu); + set_cpu_next_pwrst(cpu, power_state); + set_cpu_wakeup_addr(cpu, virt_to_phys(omap_secondary_startup)); + scu_pwrst_prepare(cpu, power_state); + + /* + * CPU never retuns back if targetted power state is OFF mode. + * CPU ONLINE follows normal CPU ONLINE ptah via + * omap_secondary_startup(). + */ + omap4_finish_suspend(cpu_state); + + set_cpu_next_pwrst(cpu, PWRDM_POWER_ON); + return 0; +} + + /* * Initialise OMAP4 MPUSS */ |