diff mbox

[PATCH/RESEND] clocksource: armada-370-xp: Enable timer divider only when needed

Message ID 1385748290-1178-1-git-send-email-ezequiel.garcia@free-electrons.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ezequiel Garcia Nov. 29, 2013, 6:04 p.m. UTC 
The current code sets the timer divider bits always. However, when
the 25 MHz timer is enabled, this is not needed and has no effect.
As this causes some confusion, rework the code so the divider is
set only when needed, i.e. when the 25 MHz timer is not in use.

Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
Resending as per Daniel's request

 drivers/clocksource/time-armada-370-xp.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Comments

Daniel Lezcano Dec. 2, 2013, 11:55 a.m. UTC | #1 
On 11/29/2013 07:04 PM, Ezequiel Garcia wrote:
> The current code sets the timer divider bits always. However, when
> the 25 MHz timer is enabled, this is not needed and has no effect.
> As this causes some confusion, rework the code so the divider is
> set only when needed, i.e. when the 25 MHz timer is not in use.
>
> Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
> ---

Applied in my tree for 3.14.

Thanks
   -- Daniel
diff mbox

Patch

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 4e7f680..ee8691b 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -76,6 +76,7 @@ 
 static void __iomem *timer_base, *local_base;
 static unsigned int timer_clk;
 static bool timer25Mhz = true;
+static u32 enable_mask;
 
 /*
  * Number of timer ticks per jiffy.
@@ -121,8 +122,7 @@  armada_370_xp_clkevt_next_event(unsigned long delta,
 	/*
 	 * Enable the timer.
 	 */
-	local_timer_ctrl_clrset(TIMER0_RELOAD_EN,
-				TIMER0_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT));
+	local_timer_ctrl_clrset(TIMER0_RELOAD_EN, enable_mask);
 	return 0;
 }
 
@@ -141,9 +141,7 @@  armada_370_xp_clkevt_mode(enum clock_event_mode mode,
 		/*
 		 * Enable timer.
 		 */
-		local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN |
-					   TIMER0_EN |
-					   TIMER0_DIV(TIMER_DIVIDER_SHIFT));
+		local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN | enable_mask);
 	} else {
 		/*
 		 * Disable timer.
@@ -240,10 +238,13 @@  static void __init armada_370_xp_timer_common_init(struct device_node *np)
 	WARN_ON(!timer_base);
 	local_base = of_iomap(np, 1);
 
-	if (timer25Mhz)
+	if (timer25Mhz) {
 		set = TIMER0_25MHZ;		
-	else
+		enable_mask = TIMER0_EN;
+	} else {
 		clr = TIMER0_25MHZ;
+		enable_mask = TIMER0_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT);
+	}
 	timer_ctrl_clrset(clr, set);
 	local_timer_ctrl_clrset(clr, set);
 
@@ -262,8 +263,7 @@  static void __init armada_370_xp_timer_common_init(struct device_node *np)
 	writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
 	writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
 
-	timer_ctrl_clrset(0, TIMER0_EN | TIMER0_RELOAD_EN |
-			     TIMER0_DIV(TIMER_DIVIDER_SHIFT));
+	timer_ctrl_clrset(0, TIMER0_RELOAD_EN | enable_mask);
 
 	/*
 	 * Set scale and timer for sched_clock.