drm/amd/display: runtime select dmub emulatior.

[Why & How]
Add emul specific hw function to dmub, in case of
emulator is created, we can runtime switch between
dmub emulator or dmub uC via is_virtual flag in dmub.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

@@ -256,6 +256,10 @@ struct dmub_srv_hw_funcs {
 
 	void (*set_inbox1_wptr)(struct dmub_srv *dmub, uint32_t wptr_offset);
 
+	uint32_t (*emul_get_inbox1_rptr)(struct dmub_srv *dmub);
+
+	void (*emul_set_inbox1_wptr)(struct dmub_srv *dmub, uint32_t wptr_offset);
+
 	bool (*is_supported)(struct dmub_srv *dmub);
 
 	bool (*is_hw_init)(struct dmub_srv *dmub);

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

@@ -199,13 +199,13 @@ enum dmub_status dmub_srv_create(struct dmub_srv *dmub,
 
 	/* Override (some) hardware funcs based on user params. */
 	if (params->hw_funcs) {
-		if (params->hw_funcs->get_inbox1_rptr)
-			dmub->hw_funcs.get_inbox1_rptr =
-				params->hw_funcs->get_inbox1_rptr;
+		if (params->hw_funcs->emul_get_inbox1_rptr)
+			dmub->hw_funcs.emul_get_inbox1_rptr =
+				params->hw_funcs->emul_get_inbox1_rptr;
 
-		if (params->hw_funcs->set_inbox1_wptr)
-			dmub->hw_funcs.set_inbox1_wptr =
-				params->hw_funcs->set_inbox1_wptr;
+		if (params->hw_funcs->emul_set_inbox1_wptr)
+			dmub->hw_funcs.emul_set_inbox1_wptr =
+				params->hw_funcs->emul_set_inbox1_wptr;
 
 		if (params->hw_funcs->is_supported)
 			dmub->hw_funcs.is_supported =