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[PATCH review for 4.4 12/47] clk: wm831x: fix usleep_range with bad range

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From: Nicholas Mc Guire <hofrat@osadl.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@osadl.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.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 763aed2de893..dfedcf5bc429 100644
--- a/drivers/clk/clk-wm831x.c
+++ b/drivers/clk/clk-wm831x.c
@@ -101,7 +101,8 @@ 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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[PATCH review for 4.4 01/47] drm_fourcc: Fix DRM_FORMAT_MOD_LINEAR  #define "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
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  [PATCH review for 4.4 35/47] mmc: sdio: fix alignment issue in struct  sdio_func "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 37/47] netfilter: invoke synchronize_rcu after  set the _hook_ to NULL "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
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  [PATCH review for 4.4 21/47] drm/amdkfd: fix improper return value on  error "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 25/47] partitions/efi: Fix integer overflow in  GPT size calculation "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 15/47] iio: adc: hx711: Add DT binding for  avia,hx711 "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 22/47] USB: serial: mos7720: fix  control-message error handling "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 14/47] iio: adc: axp288: Drop bogus  AXP288_ADC_TS_PIN_CTRL register modifications "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 08/47] MIPS: ralink: Fix incorrect assignment  on ralink_soc "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 04/47] RDS: RDMA: Fix the composite message  user notification "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
  [PATCH review for 4.4 12/47] clk: wm831x: fix usleep_range with bad  range "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
    Re: [PATCH review for 4.4 12/47] clk: wm831x: fix usleep_range with  bad range Charles Keepax <ckeepax@opensource.cirrus.com> - 2017-09-22 10:50 +0200
      Re: [PATCH review for 4.4 12/47] clk: wm831x: fix usleep_range with  bad range "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-24 02:20 +0200
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  [PATCH review for 4.4 05/47] ARM: dts: r8a7790: Use R-Car Gen 2  fallback binding for msiof nodes "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-20 07:10 +0200
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