ARM: etm: Power down etm(s) when tracing is not enabled
Without this change a saw an 18% increase in idle power consumption
on one deivce when trace support is compiled into the kernel. Now
I see the same increase only when tracing.
Change-Id: I21bb5ecf1b7d29ce3790ceeb5323409cc22d5a3b
Signed-off-by: Arve Hjønnevåg <arve@android.com>
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 82e6d38..496b8b8 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -199,7 +199,7 @@
etm_unlock(t, id);
- etm_writel(t, id, 0x440, ETMR_CTRL);
+ etm_writel(t, id, 0x441, ETMR_CTRL);
while (!(etm_readl(t, id, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout)
;
if (!timeout) {
@@ -738,7 +738,7 @@
(void)etm_readl(&tracer, t->etm_regs_count, ETMMR_OSSRR);
t->ncmppairs = etm_readl(t, t->etm_regs_count, ETMR_CONFCODE) & 0xf;
- etm_writel(t, t->etm_regs_count, 0x440, ETMR_CTRL);
+ etm_writel(t, t->etm_regs_count, 0x441, ETMR_CTRL);
etm_writel(t, t->etm_regs_count, new_count, ETMR_TRACEIDR);
etm_lock(t, t->etm_regs_count);