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Diffstat (limited to 'arch/arm/kernel/smp_scu.c')
-rw-r--r--arch/arm/kernel/smp_scu.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
index 1aafa0d785e..72f9241ad5d 100644
--- a/arch/arm/kernel/smp_scu.c
+++ b/arch/arm/kernel/smp_scu.c
@@ -17,6 +17,8 @@
#include <asm/cputype.h>
#define SCU_CTRL 0x00
+#define SCU_ENABLE (1 << 0)
+#define SCU_STANDBY_ENABLE (1 << 5)
#define SCU_CONFIG 0x04
#define SCU_CPU_STATUS 0x08
#define SCU_INVALIDATE 0x0c
@@ -50,10 +52,16 @@ void scu_enable(void __iomem *scu_base)
scu_ctrl = readl_relaxed(scu_base + SCU_CTRL);
/* already enabled? */
- if (scu_ctrl & 1)
+ if (scu_ctrl & SCU_ENABLE)
return;
- scu_ctrl |= 1;
+ scu_ctrl |= SCU_ENABLE;
+
+ /* Cortex-A9 earlier than r2p0 has no standby bit in SCU */
+ if ((read_cpuid_id() & 0xff0ffff0) == 0x410fc090 &&
+ (read_cpuid_id() & 0x00f0000f) >= 0x00200000)
+ scu_ctrl |= SCU_STANDBY_ENABLE;
+
writel_relaxed(scu_ctrl, scu_base + SCU_CTRL);
/*