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| author |   Joseph Lo <josephl@nvidia.com> | 2013-01-15 22:10:38 +0000 |
|---|---|---|
| committer |   Stephen Warren <swarren@nvidia.com> | 2013-01-28 11:20:38 -0700 |
| commit | 5c1350bdfcebf47b3b6f83d62e5860259858a54a (patch) | |
| tree | a44b2ec6cf784e7979a0be813205a1e43d6ec749 /arch/arm/mach-tegra/pm.c | |
| parent | ARM: tegra: add pending SGI checking API (diff) | |
| download | linux-dev-5c1350bdfcebf47b3b6f83d62e5860259858a54a.tar.xz linux-dev-5c1350bdfcebf47b3b6f83d62e5860259858a54a.zip | |
ARM: tegra20: cpuidle: add powered-down state for secondary CPU
The powered-down state of Tegra20 requires power gating both CPU cores.
When the secondary CPU requests to enter powered-down state, it saves
its own contexts and then enters WFI. The Tegra20 had a limition to
power down both CPU cores. The secondary CPU must waits for CPU0 in
powered-down state too. If the secondary CPU be woken up before CPU0
entering powered-down state, then it needs to restore its CPU states
and waits for next chance.
Be aware of that, you may see the legacy power state "LP2" in the code
which is exactly the same meaning of "CPU power down".
Based on the work by:
Colin Cross <ccross@android.com>
Gary King <gking@nvidia.com>
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/pm.c')
| -rw-r--r-- | arch/arm/mach-tegra/pm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c index abfe9b93cc0c..523604de666f 100644 --- a/arch/arm/mach-tegra/pm.c +++ b/arch/arm/mach-tegra/pm.c @@ -36,6 +36,7 @@ #include "iomap.h" #include "reset.h" #include "flowctrl.h" +#include "fuse.h" #include "sleep.h" #define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */ @@ -173,6 +174,8 @@ bool tegra_set_cpu_in_lp2(int phy_cpu_id) if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask)) last_cpu = true; + else if (tegra_chip_id == TEGRA20 && phy_cpu_id == 1) + tegra20_cpu_set_resettable_soon(); spin_unlock(&tegra_lp2_lock); return last_cpu; |