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clk: wm831x: fix usleep_range with bad range 

The delay here is not in atomic context and does not seem critical with
respect to precision, but usleep_range(min,max) with min==max results in
giving the timer subsystem no room to optimize uncritical delays. Fix
this by setting the range to 2000,3000 us.

Fixes: commit f05259a6ff ("clk: wm831x: Add initial WM831x clock driver")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
zero-colors
Nicholas Mc Guire 2016-12-12 08:40:09 +01:00 committed by Stephen Boyd
parent c77cbdd11b
commit ed784c532a
1 changed files with 2 additions and 1 deletions
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3
drivers/clk/clk-wm831x.c
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@ -97,7 +97,8 @@ static int wm831x_fll_prepare(struct clk_hw *hw)
if (ret != 0)
dev_crit(wm831x->dev, "Failed to enable FLL: %d\n", ret);
usleep_range(2000, 2000);
/* wait 2-3 ms for new frequency taking effect */
usleep_range(2000, 3000);
return ret;
}