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>

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();

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

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

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)
  *

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);