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ARM: imx: add sleep for pllv3 relock

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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@linaro.org>
This commit is contained in:
Shawn Guo 2013-10-30 15:12:55 +08:00
parent ec9de6cd95
commit 322503a157
1 changed files with 2 additions and 0 deletions
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2
arch/arm/mach-imx/clk-pllv3.c
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@ -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)