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thermal: rcar_thermal: Use usleep_range() instead of udelay() 

rcar_thermal_update_temp() takes a mutex, so it is always called in a
context that can sleep.  Hence replace the 300 µs busy loop by a call to
usleep_range(), to allow other threads to run.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200115125417.5263-1-geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2020-01-15 13:54:17 +01:00 committed by Daniel Lezcano
parent 1a90e73248
commit 263c8c4c76
1 changed files with 1 additions and 1 deletions
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drivers/thermal/rcar_thermal.c
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@ -219,7 +219,7 @@ static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
* to get stable temperature.
* see "Usage Notes" on datasheet
*/
udelay(300);
usleep_range(300, 400);
new = rcar_thermal_read(priv, THSSR) & CTEMP;
if (new == old) {