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| author | Joseph Lo <josephl@nvidia.com> | 2013-01-03 14:42:59 +0800 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-01-28 10:21:44 -0700 |
| commit | 57886616ca7bff844a6427436d0c8faf74653f73 (patch) | |
| tree | 4c353be72a7f266727320189e8e91965b93fa0b0 | |
| parent | 130bfed72c75a36c76ecc82d73818c6fccd2a468 (diff) | |
| download | op-kernel-dev-57886616ca7bff844a6427436d0c8faf74653f73.zip op-kernel-dev-57886616ca7bff844a6427436d0c8faf74653f73.tar.gz | |
ARM: tegra: update the cache maintenance order for CPU shutdown
Updating the cache maintenance order before CPU shutdown when doing CPU
hotplug.
The old order:
* clean L1 by flush_cache_all
* exit SMP
* CPU shutdown
Adapt to:
* disable L1 data cache by clear C bit
* clean L1 by v7_flush_dcache_louis
* exit SMP
* CPU shutdown
For CPU hotplug case, it's no need to do "flush_cache_all". And we should
disable L1 data cache before clean L1 data cache. Then leaving the SMP
coherency.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
| -rw-r--r-- | arch/arm/mach-tegra/hotplug.c | 4 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep-tegra20.S | 3 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep-tegra30.S | 3 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep.S | 4 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep.h | 1 |
5 files changed, 6 insertions, 9 deletions
diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c index dca5141..d8c683b 100644 --- a/arch/arm/mach-tegra/hotplug.c +++ b/arch/arm/mach-tegra/hotplug.c @@ -28,8 +28,8 @@ void __ref tegra_cpu_die(unsigned int cpu) { cpu = cpu_logical_map(cpu); - /* Flush the L1 data cache. */ - flush_cache_all(); + /* Clean L1 data cache */ + tegra_disable_clean_inv_dcache(); /* Shut down the current CPU. */ tegra_hotplug_shutdown(); diff --git a/arch/arm/mach-tegra/sleep-tegra20.S b/arch/arm/mach-tegra/sleep-tegra20.S index 72ce709..ad2ca07 100644 --- a/arch/arm/mach-tegra/sleep-tegra20.S +++ b/arch/arm/mach-tegra/sleep-tegra20.S @@ -33,9 +33,6 @@ * should never return */ ENTRY(tegra20_hotplug_shutdown) - /* Turn off SMP coherency */ - exit_smp r4, r5 - /* Put this CPU down */ cpu_id r0 bl tegra20_cpu_shutdown diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index 562a8e7..63a15bd 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -32,9 +32,6 @@ * Should never return. */ ENTRY(tegra30_hotplug_shutdown) - /* Turn off SMP coherency */ - exit_smp r4, r5 - /* Powergate this CPU */ mov r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN bl tegra30_cpu_shutdown diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S index 26afa7c..addae35 100644 --- a/arch/arm/mach-tegra/sleep.S +++ b/arch/arm/mach-tegra/sleep.S @@ -34,7 +34,7 @@ #include "flowctrl.h" #include "sleep.h" -#ifdef CONFIG_PM_SLEEP +#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP) /* * tegra_disable_clean_inv_dcache * @@ -60,7 +60,9 @@ ENTRY(tegra_disable_clean_inv_dcache) ldmfd sp!, {r0, r4-r5, r7, r9-r11, pc} ENDPROC(tegra_disable_clean_inv_dcache) +#endif +#ifdef CONFIG_PM_SLEEP /* * tegra_sleep_cpu_finish(unsigned long v2p) * diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h index 9821ee7..56505c3 100644 --- a/arch/arm/mach-tegra/sleep.h +++ b/arch/arm/mach-tegra/sleep.h @@ -106,6 +106,7 @@ exit_l2_resume: #else void tegra_resume(void); int tegra_sleep_cpu_finish(unsigned long); +void tegra_disable_clean_inv_dcache(void); #ifdef CONFIG_HOTPLUG_CPU void tegra20_hotplug_init(void); |
