8 files changed, 86 insertions, 10 deletions

diff --git a/docs/feature_rgb_matrix.md b/docs/feature_rgb_matrix.md
index fd866bd57..878acaf8b 100644
--- a/docs/feature_rgb_matrix.md
+++ b/docs/feature_rgb_matrix.md
@@ -439,6 +439,8 @@ These are defined in [`rgblight_list.h`](https://github.com/qmk/qmk_firmware/blo
 #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
 #define RGB_MATRIX_DISABLE_KEYCODES // disables control of rgb matrix by keycodes (must use code functions to control the feature)
+#define RGB_MATRIX_SPLIT { X, Y }       // (Optional) For split keyboards, the number of LEDs connected on each half. X = left, Y = Right.
+                                        // If RGB_MATRIX_KEYPRESSES or RGB_MATRIX_KEYRELEASES is enabled, you also will want to enable SPLIT_TRANSPORT_MIRROR
 ```
 
 ## EEPROM storage :id=eeprom-storage
diff --git a/quantum/rgb_matrix.c b/quantum/rgb_matrix.c
index ec17b4d72..69d4c0209 100644
--- a/quantum/rgb_matrix.c
+++ b/quantum/rgb_matrix.c
@@ -131,7 +131,7 @@ last_hit_t g_last_hit_tracker;
 // internals
 static uint8_t         rgb_last_enable   = UINT8_MAX;
 static uint8_t         rgb_last_effect   = UINT8_MAX;
-static effect_params_t rgb_effect_params = {0, 0xFF};
+static effect_params_t rgb_effect_params = {0, LED_FLAG_ALL, false};
 static rgb_task_states rgb_task_state    = SYNCING;
 #if RGB_DISABLE_TIMEOUT > 0
 static uint32_t rgb_anykey_timer;
@@ -143,6 +143,11 @@ static uint32_t rgb_timer_buffer;
 static last_hit_t last_hit_buffer;
 #endif  // RGB_MATRIX_KEYREACTIVE_ENABLED
 
+// split rgb matrix
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+const uint8_t k_rgb_matrix_split[2] = RGB_MATRIX_SPLIT;
+#endif
+
 void eeconfig_read_rgb_matrix(void) { eeprom_read_block(&rgb_matrix_config, EECONFIG_RGB_MATRIX, sizeof(rgb_matrix_config)); }
 
 void eeconfig_update_rgb_matrix(void) { eeprom_update_block(&rgb_matrix_config, EECONFIG_RGB_MATRIX, sizeof(rgb_matrix_config)); }
@@ -153,6 +158,7 @@ void eeconfig_update_rgb_matrix_default(void) {
     rgb_matrix_config.mode   = RGB_MATRIX_STARTUP_MODE;
     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;
+    rgb_matrix_config.flags = LED_FLAG_ALL;
     eeconfig_update_rgb_matrix();
 }
 
@@ -164,6 +170,7 @@ void eeconfig_debug_rgb_matrix(void) {
     dprintf("rgb_matrix_config.hsv.s = %d\n", rgb_matrix_config.hsv.s);
     dprintf("rgb_matrix_config.hsv.v = %d\n", rgb_matrix_config.hsv.v);
     dprintf("rgb_matrix_config.speed = %d\n", rgb_matrix_config.speed);
+    dprintf("rgb_matrix_config.flags = %d\n", rgb_matrix_config.flags);
 }
 
 __attribute__((weak)) uint8_t rgb_matrix_map_row_column_to_led_kb(uint8_t row, uint8_t column, uint8_t *led_i) { return 0; }
@@ -180,9 +187,23 @@ uint8_t rgb_matrix_map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *l
 
 void rgb_matrix_update_pwm_buffers(void) { rgb_matrix_driver.flush(); }
 
-void rgb_matrix_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) { rgb_matrix_driver.set_color(index, red, green, blue); }
+void rgb_matrix_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    if (!is_keyboard_left() && index >= k_rgb_matrix_split[0])
+        rgb_matrix_driver.set_color(index - k_rgb_matrix_split[0], red, green, blue);
+    else if (is_keyboard_left() && index < k_rgb_matrix_split[0])
+#endif
+    rgb_matrix_driver.set_color(index, red, green, blue);
+}
 
-void rgb_matrix_set_color_all(uint8_t red, uint8_t green, uint8_t blue) { rgb_matrix_driver.set_color_all(red, green, blue); }
+void rgb_matrix_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++)
+        rgb_matrix_set_color(i, red, green, blue);
+#else
+    rgb_matrix_driver.set_color_all(red, green, blue);
+#endif
+}
 
 void process_rgb_matrix(uint8_t row, uint8_t col, bool pressed) {
 #ifndef RGB_MATRIX_SPLIT
@@ -315,6 +336,10 @@ static void rgb_task_start(void) {
 static void rgb_task_render(uint8_t effect) {
     bool rendering         = false;
     rgb_effect_params.init = (effect != rgb_last_effect) || (rgb_matrix_config.enable != rgb_last_enable);
+    if (rgb_effect_params.flags != rgb_matrix_config.flags) {
+        rgb_effect_params.flags = rgb_matrix_config.flags;
+        rgb_matrix_set_color_all(0, 0, 0);
+    }
 
     // each effect can opt to do calculations
     // and/or request PWM buffer updates.
@@ -618,6 +643,6 @@ void rgb_matrix_decrease_speed_helper(bool write_to_eeprom) { rgb_matrix_set_spe
 void rgb_matrix_decrease_speed_noeeprom(void) { rgb_matrix_decrease_speed_helper(false); }
 void rgb_matrix_decrease_speed(void) { rgb_matrix_decrease_speed_helper(true); }
 
-led_flags_t rgb_matrix_get_flags(void) { return rgb_effect_params.flags; }
+led_flags_t rgb_matrix_get_flags(void) { return rgb_matrix_config.flags; }
 
-void rgb_matrix_set_flags(led_flags_t flags) { rgb_effect_params.flags = flags; }
+void rgb_matrix_set_flags(led_flags_t flags) { rgb_matrix_config.flags = flags; }
diff --git a/quantum/rgb_matrix_types.h b/quantum/rgb_matrix_types.h
index 7b8171fb2..8cd5b17a7 100644
--- a/quantum/rgb_matrix_types.h
+++ b/quantum/rgb_matrix_types.h
@@ -89,6 +89,7 @@ typedef union {
         uint8_t mode : 6;
         HSV     hsv;
         uint8_t speed;  // EECONFIG needs to be increased to support this
+        led_flags_t flags;
     };
 } rgb_config_t;
 
diff --git a/quantum/split_common/transport.c b/quantum/split_common/transport.c
index 61b61ea08..daa60bb73 100644
--- a/quantum/split_common/transport.c
+++ b/quantum/split_common/transport.c
@@ -22,6 +22,10 @@ static pin_t encoders_pad[] = ENCODERS_PAD_A;
 #    define NUMBER_OF_ENCODERS (sizeof(encoders_pad) / sizeof(pin_t))
 #endif
 
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+#    include "rgb_matrix.h"
+#endif
+
 #if defined(USE_I2C)
 
 #    include "i2c_master.h"
@@ -54,6 +58,10 @@ typedef struct _I2C_slave_buffer_t {
 #    ifdef WPM_ENABLE
     uint8_t current_wpm;
 #    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_config_t rgb_matrix;
+    bool         rgb_suspend_state;
+#    endif
 } I2C_slave_buffer_t;
 
 static I2C_slave_buffer_t *const i2c_buffer = (I2C_slave_buffer_t *)i2c_slave_reg;
@@ -68,6 +76,8 @@ static I2C_slave_buffer_t *const i2c_buffer = (I2C_slave_buffer_t *)i2c_slave_re
 #    define I2C_RGB_START offsetof(I2C_slave_buffer_t, rgblight_sync)
 #    define I2C_ENCODER_START offsetof(I2C_slave_buffer_t, encoder_state)
 #    define I2C_WPM_START offsetof(I2C_slave_buffer_t, current_wpm)
+#    define I2C_RGB_MATRIX_START offsetof(I2C_slave_buffer_t, rgb_matrix)
+#    define I2C_RGB_SUSPEND_START offsetof(I2C_slave_buffer_t, rgb_suspend_state)
 
 #    define TIMEOUT 100
 
@@ -141,6 +151,11 @@ bool transport_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
 #        endif
 #    endif
 
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_MATRIX_START, (void *)rgb_matrix_config, sizeof(i2c_buffer->rgb_matrix), TIMEOUT);
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_SUSPEND_START, (void *)g_suspend_state, sizeof(i2c_buffer->rgb_suspend_state), TIMEOUT);
+#    endif
+
 #    ifndef DISABLE_SYNC_TIMER
     i2c_buffer->sync_timer = sync_timer_read32() + SYNC_TIMER_OFFSET;
     i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_SYNC_TIME_START, (void *)&i2c_buffer->sync_timer, sizeof(i2c_buffer->sync_timer), TIMEOUT);
@@ -186,6 +201,11 @@ void transport_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     set_oneshot_mods(i2c_buffer->oneshot_mods);
 #        endif
 #    endif
+
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    memcpy((void*)i2c_buffer->rgb_matrix, (void *)rgb_matrix_config, sizeof(i2c_buffer->rgb_matrix));
+    memcpy((void*)i2c_buffer->rgb_suspend_state, (void *)g_suspend_state, sizeof(i2c_buffer->rgb_suspend_state));
+#    endif
 }
 
 void transport_master_init(void) { i2c_init(); }
@@ -226,6 +246,10 @@ typedef struct _Serial_m2s_buffer_t {
 #    ifdef WPM_ENABLE
     uint8_t      current_wpm;
 #    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_config_t rgb_matrix;
+    bool         rgb_suspend_state;
+#    endif
 } Serial_m2s_buffer_t;
 
 #    if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
@@ -343,6 +367,12 @@ bool transport_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     serial_m2s_buffer.oneshot_mods = get_oneshot_mods();
 #        endif
 #    endif
+
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    serial_m2s_buffer.rgb_matrix = rgb_matrix_config;
+    serial_m2s_buffer.rgb_suspend_state = g_suspend_state;
+#    endif
+
 #    ifndef DISABLE_SYNC_TIMER
     serial_m2s_buffer.sync_timer   = sync_timer_read32() + SYNC_TIMER_OFFSET;
 #    endif
@@ -381,6 +411,11 @@ void transport_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     set_oneshot_mods(serial_m2s_buffer.oneshot_mods);
 #        endif
 #    endif
+
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_matrix_config = serial_m2s_buffer.rgb_matrix;
+    g_suspend_state = serial_m2s_buffer.rgb_suspend_state;
+#    endif
 }
 
 #endif
diff --git a/tmk_core/common/avr/suspend.c b/tmk_core/common/avr/suspend.c
index 47a82a2ee..d52c8ac41 100644
--- a/tmk_core/common/avr/suspend.c
+++ b/tmk_core/common/avr/suspend.c
@@ -28,6 +28,10 @@
 #    include "rgblight.h"
 #endif
 
+#ifdef RGB_MATRIX_ENABLE
+#    include "rgb_matrix.h"
+#endif
+
 /** \brief Suspend idle
  *
  * FIXME: needs doc
diff --git a/tmk_core/common/chibios/suspend.c b/tmk_core/common/chibios/suspend.c
index 49e20641f..17f024cab 100644
--- a/tmk_core/common/chibios/suspend.c
+++ b/tmk_core/common/chibios/suspend.c
@@ -24,6 +24,10 @@
 #    include "rgblight.h"
 #endif
 
+#ifdef RGB_MATRIX_ENABLE
+#    include "rgb_matrix.h"
+#endif
+
 /** \brief suspend idle
  *
  * FIXME: needs doc
@@ -53,6 +57,10 @@ void suspend_power_down(void) {
     backlight_set(0);
 #endif
 
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_task();
+#endif
+
     // Turn off LED indicators
     uint8_t leds_off = 0;
 #if defined(BACKLIGHT_CAPS_LOCK) && defined(BACKLIGHT_ENABLE)
diff --git a/tmk_core/common/eeconfig.c b/tmk_core/common/eeconfig.c
index 5e3ebe6ee..92a509217 100644
--- a/tmk_core/common/eeconfig.c
+++ b/tmk_core/common/eeconfig.c
@@ -57,7 +57,7 @@ void eeconfig_init_quantum(void) {
     eeprom_update_dword(EECONFIG_HAPTIC, 0);
     eeprom_update_byte(EECONFIG_VELOCIKEY, 0);
     eeprom_update_dword(EECONFIG_RGB_MATRIX, 0);
-    eeprom_update_byte(EECONFIG_RGB_MATRIX_SPEED, 0);
+    eeprom_update_word(EECONFIG_RGB_MATRIX_EXTENDED, 0);
 
     // TODO: Remove once ARM has a way to configure EECONFIG_HANDEDNESS
     //        within the emulated eeprom via dfu-util or another tool
diff --git a/tmk_core/common/eeconfig.h b/tmk_core/common/eeconfig.h
index 86b9e6f99..39bc51d5d 100644
--- a/tmk_core/common/eeconfig.h
+++ b/tmk_core/common/eeconfig.h
@@ -21,7 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdbool.h>
 
 #ifndef EECONFIG_MAGIC_NUMBER
-#    define EECONFIG_MAGIC_NUMBER (uint16_t)0xFEEB  // When changing, decrement this value to avoid future re-init issues
+#    define EECONFIG_MAGIC_NUMBER (uint16_t)0xFEEA  // When changing, decrement this value to avoid future re-init issues
 #endif
 #define EECONFIG_MAGIC_NUMBER_OFF (uint16_t)0xFFFF
 
@@ -44,11 +44,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define EECONFIG_HAPTIC (uint32_t *)24
 #define EECONFIG_RGB_MATRIX (uint32_t *)28
-#define EECONFIG_RGB_MATRIX_SPEED (uint8_t *)32
+// Speed & Flags
+#define EECONFIG_RGB_MATRIX_EXTENDED (uint16_t *)32
 // TODO: Combine these into a single word and single block of EEPROM
-#define EECONFIG_KEYMAP_UPPER_BYTE (uint8_t *)33
+#define EECONFIG_KEYMAP_UPPER_BYTE (uint8_t *)34
 // Size of EEPROM being used, other code can refer to this for available EEPROM
-#define EECONFIG_SIZE 34
+#define EECONFIG_SIZE 35
 /* debug bit */
 #define EECONFIG_DEBUG_ENABLE (1 << 0)
 #define EECONFIG_DEBUG_MATRIX (1 << 1)