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Date: Thu, 14 Sep 2017 15:51:12 +0000 From: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> Cc: Nicholas Mc Guire <hofrat@...dl.org>, Stephen Boyd <sboyd@...eaurora.org>, "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> Subject: [PATCH for 4.9 23/59] clk: wm831x: fix usleep_range with bad range From: Nicholas Mc Guire <hofrat@...dl.org> [ Upstream commit ed784c532a3d0959db488f40a96c5127f63d42dc ] 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 f05259a6ffa4 ("clk: wm831x: Add initial WM831x clock driver") Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org> Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> --- drivers/clk/clk-wm831x.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-wm831x.c b/drivers/clk/clk-wm831x.c index 0621fbfb4beb..a47960aacfa5 100644 --- a/drivers/clk/clk-wm831x.c +++ b/drivers/clk/clk-wm831x.c @@ -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; } -- 2.11.0
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