svn commit: r366140 - head/sys/arm/allwinner

[Andriy Gapon]

Author: avg
Date: Fri Sep 25 07:40:26 2020
New Revision: 366140
URL: https://svnweb.freebsd.org/changeset/base/366140

Log:
  aw_pwm: fix programming of the period
  
  The programmed value is biased by one: 0 means 1 cycle,
  1 means 2 cycles, etc.
  
  MFC after:	3 weeks

Modified:
  head/sys/arm/allwinner/aw_pwm.c

Modified: head/sys/arm/allwinner/aw_pwm.c
==============================================================================
--- head/sys/arm/allwinner/aw_pwm.c	Fri Sep 25 07:40:02 2020	(r366139)
+++ head/sys/arm/allwinner/aw_pwm.c	Fri Sep 25 07:40:26 2020	(r366140)
@@ -293,7 +293,7 @@ aw_pwm_channel_config(device_t dev, u_int channel, u_i
 	AW_PWM_WRITE(sc, AW_PWM_CTRL, reg);
 
 	/* Write the total/active cycles */
-	reg = ((clk_rate / period_freq) << AW_PWM_PERIOD_TOTAL_SHIFT) |
+	reg = ((clk_rate / period_freq - 1) << AW_PWM_PERIOD_TOTAL_SHIFT) |
 	  ((clk_rate / duty_freq) << AW_PWM_PERIOD_ACTIVE_SHIFT);
 	AW_PWM_WRITE(sc, AW_PWM_PERIOD, reg);