drm/amd/display: Add support for manual DMUB FAMS trigger

- Add is_drr parameter to indicate DRR is enabled on
the panel to determine whether SubVP MCLK switch
logic should be enabled

- Add DRR manual trigger in FW (instead of driver)
because manual trigger programming triggers DRR
update pending and can block SubVP MCLK switches
from taking place

Acked-by: Alex Hung <[e-mail]>
Signed-off-by: Anthony Koo <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

···
 			uint16_t vtotal;
 			uint8_t main_pipe_index;
 			uint8_t phantom_pipe_index;
-			uint8_t padding[2];
+			uint8_t is_drr;
+			uint8_t padding;
 		} subvp_data;
 
 		struct {
···
 	DMUB_CMD__FAMS_SETUP_FW_CTRL	= 0,
 	DMUB_CMD__FAMS_DRR_UPDATE		= 1,
 	DMUB_CMD__HANDLE_SUBVP_CMD	= 2, // specifically for SubVP cmd
+	/**
+	 * For SubVP set manual trigger in FW because it
+	 * triggers DRR_UPDATE_PENDING which SubVP relies
+	 * on (for any SubVP cases that use a DRR display)
+	 */
+	DMUB_CMD__FAMS_SET_MANUAL_TRIGGER = 3,
 };
 
 /**