svn commit: r366139 - head/sys/arm/allwinner

[Andriy Gapon]

Author: avg
Date: Fri Sep 25 07:40:02 2020
New Revision: 366139
URL: https://svnweb.freebsd.org/changeset/base/366139

Log:
  aw_pwm: fix selection of the prescaler
  
  Prescaling divides the frequency, not multiplies it.
  
  MFC after:	2 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 07:39:41 2020	(r366138)
+++ head/sys/arm/allwinner/aw_pwm.c	Fri Sep 25 07:40:02 2020	(r366139)
@@ -274,7 +274,7 @@ aw_pwm_channel_config(device_t dev, u_int channel, u_i
 		for (i = 0; i < nitems(aw_pwm_clk_prescaler); i++) {
 			if (aw_pwm_clk_prescaler[i] == 0)
 				continue;
-			div = (AW_PWM_MAX_FREQ * aw_pwm_clk_prescaler[i]) / period_freq;
+			div = AW_PWM_MAX_FREQ / aw_pwm_clk_prescaler[i] / period_freq;
 			if ((div - 1) < AW_PWM_PERIOD_TOTAL_MASK ) {
 				prescaler = i;
 				clk_rate = AW_PWM_MAX_FREQ / aw_pwm_clk_prescaler[i];