Add PWM minimum duty

Replaces SMOOTH_FANS_MIN. Turn fans off when the target is below a
certain duty, and turn don't turn fans on until that duty is reached.

All boards should probably define this.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/board/system76/common/fan.c

@@ -95,14 +95,18 @@ void fan_event(void) {
         fan1_pwm_target = 0;
         fan1_pwm_actual = 0;
     } else if (fan1_pwm_actual < fan1_pwm_target) {
-        // TODO :Check against board-defined maximum
         if (fan1_pwm_actual < CTR0) {
             fan1_pwm_actual++;
+            if (fan1_pwm_actual < FAN1.pwm_min) {
+                fan1_pwm_actual = FAN1.pwm_min;
+            }
         }
     } else if (fan1_pwm_actual > fan1_pwm_target) {
-        // TODO: Check against board-defined minimum
         if (fan1_pwm_actual > 0) {
             fan1_pwm_actual--;
+            if (fan1_pwm_actual < FAN1.pwm_min) {
+                fan1_pwm_actual = 0;
+            }
         }
     }
     TRACE("FAN1 duty=%d\n", fan1_pwm_actual);
@@ -119,14 +123,18 @@ void fan_event(void) {
         fan2_pwm_target = 0;
         fan2_pwm_actual = 0;
     } else if (fan2_pwm_actual < fan2_pwm_target) {
-        // TODO :Check against board-defined maximum
         if (fan2_pwm_actual < CTR0) {
             fan2_pwm_actual++;
+            if (fan2_pwm_actual < FAN2.pwm_min) {
+                fan2_pwm_actual = FAN2.pwm_min;
+            }
         }
     } else if (fan2_pwm_actual > fan2_pwm_target) {
-        // TODO: Check against board-defined minimum
         if (fan2_pwm_actual > 0) {
             fan2_pwm_actual--;
+            if (fan2_pwm_actual < FAN2.pwm_min) {
+                fan2_pwm_actual = 0;
+            }
         }
     }
     TRACE("FAN2 duty=%d\n", fan2_pwm_actual);

src/board/system76/common/include/board/fan.h

@@ -18,6 +18,7 @@ struct FanPoint {
 struct Fan {
     const struct FanPoint *const points;
     const uint8_t points_size;
+    const uint8_t pwm_min;
 };
 
 extern const struct Fan __code FAN1;

src/board/system76/darp10-b/fan.c

@@ -17,6 +17,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(27),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -33,4 +34,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(27),
 };

src/board/system76/gaze17-3050/fan.c

@@ -16,6 +16,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(20),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -31,4 +32,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(20),
 };

src/board/system76/oryp11/fan.c

@@ -16,6 +16,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(28),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -31,4 +32,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(28),
 };

src/board/system76/oryp6/fan.c

@@ -16,6 +16,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -31,4 +32,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };

src/board/system76/oryp7/fan.c

@@ -16,6 +16,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -31,4 +32,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };

src/board/system76/oryp8/fan.c

@@ -16,6 +16,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -31,4 +32,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(25),
 };

src/board/system76/serw13/fan.c

@@ -15,6 +15,7 @@ static const struct FanPoint __code FAN1_POINTS[] = {
 const struct Fan __code FAN1 = {
     .points = FAN1_POINTS,
     .points_size = ARRAY_SIZE(FAN1_POINTS),
+    .pwm_min = PWM_DUTY(28),
 };
 
 static const struct FanPoint __code FAN2_POINTS[] = {
@@ -29,4 +30,5 @@ static const struct FanPoint __code FAN2_POINTS[] = {
 const struct Fan __code FAN2 = {
     .points = FAN2_POINTS,
     .points_size = ARRAY_SIZE(FAN2_POINTS),
+    .pwm_min = PWM_DUTY(28),
 };