ADD RGBLIGHT_LIMIT_VAL (#2214)

docs/feature_rgblight.md

@@ -41,6 +41,7 @@ You can change the behavior of the RGB Lighting by setting these configuration v
 | `RGBLIGHT_HUE_STEP` | 10 | How many hues you want to have available. |
 | `RGBLIGHT_SAT_STEP` | 17 | How many steps of saturation you'd like. |
 | `RGBLIGHT_VAL_STEP` | 17 | The number of levels of brightness you want. |
+| `RGBLIGHT_LIMIT_VAL` | 255 | Limit the val of HSV to limit the maximum brightness simply. |
 
 ### Animations
 

quantum/rgblight.c

@@ -46,6 +46,12 @@ bool rgblight_timer_enabled = false;
 void sethsv(uint16_t hue, uint8_t sat, uint8_t val, LED_TYPE *led1) {
   uint8_t r = 0, g = 0, b = 0, base, color;
 
+  #ifdef RGBLIGHT_LIMIT_VAL
+    if (val > RGBLIGHT_LIMIT_VAL) {
+      val=RGBLIGHT_LIMIT_VAL; // limit the val
+    }
+  #endif
+
   if (sat == 0) { // Acromatic color (gray). Hue doesn't mind.
     r = val;
     g = val;