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>

5 files changed, 6 insertions, 9 deletions

diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
index dca5141a2c31..d8c683b875d1 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 72ce709799da..ad2ca07d0578 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 562a8e7e413d..63a15bd9b653 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 26afa7cbed11..addae357da3f 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 9821ee725420..56505c381ea8 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);