diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index d7f3619352f0..829410a883a1 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -976,8 +976,16 @@ struct dmub_cmd_fw_assisted_mclk_switch_pipe_data_v2 {
 			uint16_t vtotal;
 			uint8_t main_pipe_index;
 			uint8_t phantom_pipe_index;
+			/* Since the microschedule is calculated in terms of OTG lines,
+			 * include any scaling factors to make sure when we get accurate
+			 * conversion when programming MALL_START_LINE (which is in terms
+			 * of HUBP lines). If 4K is being downscaled to 1080p, scale factor
+			 * is 1/2 (numerator = 1, denominator = 2).
+			 */
+			uint8_t scale_factor_numerator;
+			uint8_t scale_factor_denominator;
 			uint8_t is_drr;
-			uint8_t padding;
+			uint8_t pad[2];
 		} subvp_data;
 
 		struct {
@@ -999,7 +1007,11 @@ struct dmub_cmd_fw_assisted_mclk_switch_pipe_data_v2 {
 		} vblank_data;
 	} pipe_config;
 
-	enum mclk_switch_mode mode;
+	/* - subvp_data in the union (pipe_config) takes up 27 bytes.
+	 * - Make the "mode" field a uint8_t instead of enum so we only use 1 byte (only
+	 *   for the DMCUB command, cast to enum once we populate the DMCUB subvp state).
+	 */
+	uint8_t mode; // enum mclk_switch_mode
 };
 
 /**