drm/dp: Kill total_pbn and total_slots in struct drm_dp_mst_topology_mgr

The total vcpi time slots is always 63 and does not depend on the link BW,
remove total_slots from MST topology manager struct. The next change is to
remove total_pbn which is hardcoded to 2560. The total PBN that the
topology manager allocates from depends on the link rate and is not a
constant. So, fix this by removing the total_pbn member itself.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1489648231-30700-2-git-send-email-dhinakaran.pandiyan@intel.com

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -2042,9 +2042,8 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
 			goto out_unlock;
 		}
 
-		mgr->total_pbn = 2560;
-		mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div);
-		mgr->avail_slots = mgr->total_slots;
+		/* max. time slots - one slot for MTP header */
+		mgr->avail_slots = 63;
 
 		/* add initial branch device at LCT 1 */
 		mstb = drm_dp_add_mst_branch_device(1, NULL);

include/drm/drm_dp_mst_helper.h

@@ -479,18 +479,11 @@ struct drm_dp_mst_topology_mgr {
 	 * @pbn_div: PBN to slots divisor.
 	 */
 	int pbn_div;
-	/**
-	 * @total_slots: Total slots that can be allocated.
-	 */
-	int total_slots;
+
 	/**
 	 * @avail_slots: Still available slots that can be allocated.
 	 */
 	int avail_slots;
-	/**
-	 * @total_pbn: Total PBN count.
-	 */
-	int total_pbn;
 
 	/**
 	 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and