aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMaxime Ripard <maxime.ripard@free-electrons.com>2015-03-26 10:27:09 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-26 10:59:40 +0100
commit6e206020324c50a95486f6b279a53512febed92d (patch)
tree1bfda9e20d5aaec0802bf7d57cf3f0750d8d9959
parent11bc26fe372fa6da81c82c68f755d2795838a640 (diff)
downloadlinux-6e206020324c50a95486f6b279a53512febed92d.tar.gz
clocksource/drivers/sun5i: Fix cpufreq interaction with sched_clock()
The sun5i timer is used as the sched-clock on certain systems, and ever since we started using cpufreq, the cpu clock (that is one of the timer's clock indirect parent) now changes as well, along with the actual sched_clock() rate. This is not accurate and not desirable. We can safely remove the sun5i sched-clock on those systems, since we have other reliable sched_clock() sources in the system. Tested-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> [ Improved the changelog. ] Cc: richard@nod.at Link: http://lkml.kernel.org/r/1427362029-6511-4-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--drivers/clocksource/timer-sun5i.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c
index 5dcbf90b801..58597fbcc04 100644
--- a/drivers/clocksource/timer-sun5i.c
+++ b/drivers/clocksource/timer-sun5i.c
@@ -17,7 +17,6 @@
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/reset.h>
-#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@@ -137,11 +136,6 @@ static struct irqaction sun5i_timer_irq = {
.dev_id = &sun5i_clockevent,
};
-static u64 sun5i_timer_sched_read(void)
-{
- return ~readl(timer_base + TIMER_CNTVAL_LO_REG(1));
-}
-
static void __init sun5i_timer_init(struct device_node *node)
{
struct reset_control *rstc;
@@ -172,7 +166,6 @@ static void __init sun5i_timer_init(struct device_node *node)
writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD,
timer_base + TIMER_CTL_REG(1));
- sched_clock_register(sun5i_timer_sched_read, 32, rate);
clocksource_mmio_init(timer_base + TIMER_CNTVAL_LO_REG(1), node->name,
rate, 340, 32, clocksource_mmio_readl_down);