diff --git a/drivers/video/rockchip/rga3/include/rga.h b/drivers/video/rockchip/rga3/include/rga.h
index 21aa72d373e7..8415c7555477 100644
--- a/drivers/video/rockchip/rga3/include/rga.h
+++ b/drivers/video/rockchip/rga3/include/rga.h
@@ -612,7 +612,7 @@ struct rga_req {
 	/* porter duff alpha mode sel */
 	uint8_t PD_mode;
 
-	/* global alpha value */
+	/* legacy: global alpha value */
 	uint8_t alpha_global_value;
 
 	/* rop2/3/4 code scan from rop code table*/
@@ -674,7 +674,11 @@ struct rga_req {
 
 	struct rga_pre_intr_info pre_intr_info;
 
-	uint8_t reservr[59];
+	/* global alpha */
+	uint8_t fg_global_alpha;
+	uint8_t bg_global_alpha;
+
+	uint8_t reservr[57];
 };
 
 struct rga_alpha_config {
diff --git a/drivers/video/rockchip/rga3/rga2_reg_info.c b/drivers/video/rockchip/rga3/rga2_reg_info.c
index c987919cfff3..aa3ff9e44037 100644
--- a/drivers/video/rockchip/rga3/rga2_reg_info.c
+++ b/drivers/video/rockchip/rga3/rga2_reg_info.c
@@ -2087,11 +2087,21 @@ static void rga_cmd_to_rga2_cmd(struct rga_scheduler_t *scheduler,
 				req->alpha_config.bg_pixel_alpha_en =
 					rga_is_alpha_format(req->dst.format);
 
-			req->alpha_config.fg_global_alpha_en = false;
-			req->alpha_config.bg_global_alpha_en = false;
+			if (req_rga->fg_global_alpha < 0xff) {
+				req->alpha_config.fg_global_alpha_en = true;
+				req->alpha_config.fg_global_alpha_value = req_rga->fg_global_alpha;
+			} else if (!req->alpha_config.fg_pixel_alpha_en) {
+				req->alpha_config.fg_global_alpha_en = true;
+				req->alpha_config.fg_global_alpha_value = 0xff;
+			}
 
-			req->alpha_config.fg_global_alpha_value = req_rga->alpha_global_value;
-			req->alpha_config.bg_global_alpha_value = req_rga->alpha_global_value;
+			if (req_rga->bg_global_alpha < 0xff) {
+				req->alpha_config.bg_global_alpha_en = true;
+				req->alpha_config.bg_global_alpha_value = req_rga->bg_global_alpha;
+			} else if (!req->alpha_config.bg_pixel_alpha_en) {
+				req->alpha_config.bg_global_alpha_en = true;
+				req->alpha_config.bg_global_alpha_value = 0xff;
+			}
 
 			/* porter duff alpha enable */
 			switch (req_rga->PD_mode) {
@@ -2105,20 +2115,6 @@ static void rga_cmd_to_rga2_cmd(struct rga_scheduler_t *scheduler,
 				req->alpha_config.mode = RGA_ALPHA_BLEND_DST;
 				break;
 			case 3:
-				if ((req_rga->alpha_rop_mode & 3) == 0) {
-					/* both use globalAlpha. */
-					req->alpha_config.fg_global_alpha_en = true;
-					req->alpha_config.bg_global_alpha_en = true;
-				} else if ((req_rga->alpha_rop_mode & 3) == 1) {
-					/* Do not use globalAlpha. */
-					req->alpha_config.fg_global_alpha_en = false;
-					req->alpha_config.bg_global_alpha_en = false;
-				} else {
-					/* dst use globalAlpha */
-					req->alpha_config.fg_global_alpha_en = false;
-					req->alpha_config.bg_global_alpha_en = true;
-				}
-
 				req->alpha_config.mode = RGA_ALPHA_BLEND_SRC_OVER;
 				break;
 			case 4:
diff --git a/drivers/video/rockchip/rga3/rga3_reg_info.c b/drivers/video/rockchip/rga3/rga3_reg_info.c
index b1d0f6b9ff69..69eab8b6606c 100644
--- a/drivers/video/rockchip/rga3/rga3_reg_info.c
+++ b/drivers/video/rockchip/rga3/rga3_reg_info.c
@@ -1070,7 +1070,7 @@ static void RGA3_set_reg_overlap_info(u8 *base, struct rga3_req *msg)
 	bottom_color_ctrl.bits.alpha_cal_mode = RGA_ALPHA_SATURATION;
 
 	top_color_ctrl.bits.global_alpha = config->fg_global_alpha_value;
-	bottom_color_ctrl.bits.global_alpha = config->fg_global_alpha_value;
+	bottom_color_ctrl.bits.global_alpha = config->bg_global_alpha_value;
 
 	/* porter duff alpha enable */
 	switch (config->mode) {
@@ -1643,11 +1643,21 @@ static void rga_cmd_to_rga3_cmd(struct rga_req *req_rga, struct rga3_req *req)
 			req->alpha_config.fg_pixel_alpha_en = rga_is_alpha_format(req->win1.format);
 			req->alpha_config.bg_pixel_alpha_en = rga_is_alpha_format(req->win0.format);
 
-			req->alpha_config.fg_global_alpha_en = false;
-			req->alpha_config.bg_global_alpha_en = false;
+			if (req_rga->fg_global_alpha < 0xff) {
+				req->alpha_config.fg_global_alpha_en = true;
+				req->alpha_config.fg_global_alpha_value = req_rga->fg_global_alpha;
+			} else if (!req->alpha_config.fg_pixel_alpha_en) {
+				req->alpha_config.fg_global_alpha_en = true;
+				req->alpha_config.fg_global_alpha_value = 0xff;
+			}
 
-			req->alpha_config.fg_global_alpha_value = req_rga->alpha_global_value;
-			req->alpha_config.bg_global_alpha_value = req_rga->alpha_global_value;
+			if (req_rga->bg_global_alpha < 0xff) {
+				req->alpha_config.bg_global_alpha_en = true;
+				req->alpha_config.bg_global_alpha_value = req_rga->bg_global_alpha;
+			} else if (!req->alpha_config.bg_pixel_alpha_en) {
+				req->alpha_config.bg_global_alpha_en = true;
+				req->alpha_config.bg_global_alpha_value = 0xff;
+			}
 
 			/* porter duff alpha enable */
 			switch (req_rga->PD_mode) {
@@ -1661,20 +1671,6 @@ static void rga_cmd_to_rga3_cmd(struct rga_req *req_rga, struct rga3_req *req)
 				req->alpha_config.mode = RGA_ALPHA_BLEND_DST;
 				break;
 			case 3:
-				if ((req_rga->alpha_rop_mode & 3) == 0) {
-					/* both use globalAlpha. */
-					req->alpha_config.fg_global_alpha_en = true;
-					req->alpha_config.bg_global_alpha_en = true;
-				} else if ((req_rga->alpha_rop_mode & 3) == 1) {
-					/* Do not use globalAlpha. */
-					req->alpha_config.fg_global_alpha_en = false;
-					req->alpha_config.bg_global_alpha_en = false;
-				} else {
-					/* dst use globalAlpha */
-					req->alpha_config.fg_global_alpha_en = false;
-					req->alpha_config.bg_global_alpha_en = true;
-				}
-
 				req->alpha_config.mode = RGA_ALPHA_BLEND_SRC_OVER;
 				break;
 			case 4: