[PATCH 1/2] ARM: tegra: update the cache maintenance order for CPU shutdown
From: Joseph Lo <hidden>
Date: 2012-12-20 02:28:38
Also in:
linux-tegra
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> --- arch/arm/mach-tegra/hotplug.c | 4 ++-- arch/arm/mach-tegra/sleep-tegra20.S | 3 --- arch/arm/mach-tegra/sleep-tegra30.S | 3 --- arch/arm/mach-tegra/sleep.S | 4 +++- 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);
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1.7.0.4