[PATCH 04/10] ARM: imx: initialize cpu power up counters
From: Shawn Guo <hidden>
Date: 2012-10-23 15:22:53
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
The default values of cpu power up counters are unnecessarily large. Initialize them to small ones for minimizing the power up latency. Signed-off-by: Shawn Guo <redacted> --- arch/arm/mach-imx/gpc.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c
index e1537f9..c75842d 100644
--- a/arch/arm/mach-imx/gpc.c
+++ b/arch/arm/mach-imx/gpc.c@@ -19,6 +19,7 @@ #define GPC_IMR1 0x008 #define GPC_PGC_CPU_PDN 0x2a0 +#define GPC_PGC_CPU_PUPSCR 0x2a4 #define IMR_NUM 4
@@ -106,6 +107,9 @@ void __init imx_gpc_init(void) gpc_base = of_iomap(np, 0); WARN_ON(!gpc_base); + /* Initialize cpu power up counters to minimize the latency */ + writel_relaxed(0x101, gpc_base + GPC_PGC_CPU_PUPSCR); + /* Register GPC as the secondary interrupt controller behind GIC */ gic_arch_extn.irq_mask = imx_gpc_irq_mask; gic_arch_extn.irq_unmask = imx_gpc_irq_unmask;
--
1.7.9.5