[PATCH 1/3] ARM: imx: add sleep for pllv3 relock
Shawn Guo
shawn.guo at linaro.org
Fri Nov 1 05:02:23 EDT 2013
The pllv3 relock time varies in the range of 50us ~ 500us, depending on
the specific PLL type, e.g. 50us for ARM PLL and 450us for Audio/Video
PLL. Let's add a usleep_range() call instead of doing busy wait during
relock.
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
arch/arm/mach-imx/clk-pllv3.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mach-imx/clk-pllv3.c b/arch/arm/mach-imx/clk-pllv3.c
index f6640b6..c9ca191 100644
--- a/arch/arm/mach-imx/clk-pllv3.c
+++ b/arch/arm/mach-imx/clk-pllv3.c
@@ -12,6 +12,7 @@
#include <linux/clk.h>
#include <linux/clk-provider.h>
+#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
@@ -66,6 +67,7 @@ static int clk_pllv3_prepare(struct clk_hw *hw)
break;
if (time_after(jiffies, timeout))
break;
+ usleep_range(50, 500);
} while (1);
if (readl_relaxed(pll->base) & BM_PLL_LOCK)
--
1.7.9.5
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