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reform/pm: fix lcd pwm cycle setting precision

--- a/sys/src/cmd/reform/pm.c

+++ b/sys/src/cmd/reform/pm.c

@@ -8,8 +8,6 @@

 enum

 {

-	Mhz = 1000*1000,

-	Pwmsrcclk = 25*Mhz,

 	Kbdlightmax = 8,

 	Scharge = 0,

@@ -254,8 +252,7 @@

 	}

 	if(k == Lcd){

-		v = Pwmsrcclk / rd(pwm2, PWMSAR);

-		wr(pwm2, PWMPR, (Pwmsrcclk/(v*p[0]/100))-2);

+		wr(pwm2, PWMPR, (p[0] ? 100*rd(pwm2, PWMSAR)/p[0] : 0)-1);

 		return 0;

 	}else if(k == Kbd && openhidctl(&hidkb, udidkb) == 0){

 		v = Kbdlightmax*p[0]/100;

@@ -285,8 +282,9 @@

 	SET(m);

 	if(k == Lcd){

-		m = Pwmsrcclk / rd(pwm2, PWMSAR);

-		v[0] = Pwmsrcclk / (rd(pwm2, PWMPR)+2);

+		m = rd(pwm2, PWMPR)+1;

+		v[0] = m ? rd(pwm2, PWMSAR)*100/m : 0;

+		return;

 	}else if(k == Kbd){

 		m = 100;

 		v[0] = kbdlight;