Configuration values for starting HSV and speed (#7740)

* Define default HSV and speed for RGB matrix.

* Documentation for configuration values RGB_MATRIX_STARTUP_HUE, RGB_MATRIX_STARTUP_SAT and RGB_MATRIX_STARTUP_VAL.

* Document RGB_MATRIX_STARTUP_SPD.

* Preserve the ordering.

docs/feature_rgb_matrix.md

@@ -380,6 +380,10 @@ These are defined in [`rgblight_list.h`](https://github.com/qmk/qmk_firmware/blo
 #define RGB_MATRIX_LED_FLUSH_LIMIT 16 // limits in milliseconds how frequently an animation will update the LEDs. 16 (16ms) is equivalent to limiting to 60fps (increases keyboard responsiveness)
 #define RGB_MATRIX_MAXIMUM_BRIGHTNESS 200 // limits maximum brightness of LEDs to 200 out of 255. If not defined maximum brightness is set to 255
 #define RGB_MATRIX_STARTUP_MODE RGB_MATRIX_CYCLE_LEFT_RIGHT // Sets the default mode, if none has been set
+#define RGB_MATRIX_STARTUP_HUE 0 // Sets the default hue value, if none has been set
+#define RGB_MATRIX_STARTUP_SAT 255 // Sets the default saturation value, if none has been set
+#define RGB_MATRIX_STARTUP_VAL RGB_MATRIX_MAXIMUM_BRIGHTNESS // Sets the default brightness value, if none has been set
+#define RGB_MATRIX_STARTUP_SPD 127 // Sets the default animation speed, if none has been set
 ```
 
 ## EEPROM storage

quantum/rgb_matrix.c

@@ -95,6 +95,23 @@ const point_t k_rgb_matrix_center = RGB_MATRIX_CENTER;
 #    endif
 #endif
 
+#if !defined(RGB_MATRIX_STARTUP_HUE)
+#    define RGB_MATRIX_STARTUP_HUE 0
+#endif
+
+#if !defined(RGB_MATRIX_STARTUP_SAT)
+#    define RGB_MATRIX_STARTUP_SAT UINT8_MAX
+#endif
+
+#if !defined(RGB_MATRIX_STARTUP_VAL)
+#    define RGB_MATRIX_STARTUP_VAL RGB_MATRIX_MAXIMUM_BRIGHTNESS
+#endif
+
+#if !defined(RGB_MATRIX_STARTUP_SPD)
+#    define RGB_MATRIX_STARTUP_SPD UINT8_MAX / 2
+#endif
+
+
 bool g_suspend_state = false;
 
 rgb_config_t rgb_matrix_config;
@@ -119,8 +136,8 @@ void eeconfig_update_rgb_matrix_default(void) {
     dprintf("eeconfig_update_rgb_matrix_default\n");
     rgb_matrix_config.enable = 1;
     rgb_matrix_config.mode   = RGB_MATRIX_STARTUP_MODE;
-    rgb_matrix_config.hsv    = (HSV){0, UINT8_MAX, RGB_MATRIX_MAXIMUM_BRIGHTNESS};
-    rgb_matrix_config.speed  = UINT8_MAX / 2;
+    rgb_matrix_config.hsv    = (HSV){RGB_MATRIX_STARTUP_HUE, RGB_MATRIX_STARTUP_SAT, RGB_MATRIX_STARTUP_VAL};
+    rgb_matrix_config.speed  = RGB_MATRIX_STARTUP_SPD;
     eeconfig_update_rgb_matrix();
 }