msm: mdss: refactor the rotation logic

Creating a rotation session manager to manage the rotation sessions.
At creation time, rotation object is not assigned to the underlying
hardware resources (i.e. pipe, mixer, controller, and write-back).
The hardware assignment happens only at the time of commit, and released
after the commit is done.

Change-Id: I33bf625a177362953c11eefc2a779a5af409964b
Signed-off-by: Xiaoming Zhou <zhoux@codeaurora.org>

drivers/video/fbdev/msm/mdss_mdp.c

@@ -53,6 +53,7 @@
 #include "mdss_panel.h"
 #include "mdss_debug.h"
 #include "mdss_mdp_debug.h"
+#include "mdss_mdp_rotator.h"
 
 #define CREATE_TRACE_POINTS
 #include "mdss_mdp_trace.h"
@@ -1546,6 +1547,11 @@ static int mdss_mdp_probe(struct platform_device *pdev)
 		pr_err("unable to register bus scaling\n");
 		goto probe_done;
 	}
+	rc = mdss_mdp_rot_mgr_init();
+	if (rc) {
+		pr_err("unable to initialize rotation mgr\n");
+		goto probe_done;
+	}
 
 	rc = mdss_mdp_debug_init(mdata);
 	if (rc) {

drivers/video/fbdev/msm/mdss_mdp_rotator.h

@@ -21,7 +21,6 @@
 
 struct mdss_mdp_rotator_session {
 	u32 session_id;
-	u32 ref_cnt;
 	u32 params_changed;
 	int pid;
 
@@ -36,7 +35,6 @@ struct mdss_mdp_rotator_session {
 	u32 dnsc_factor_h;
 
 	u32 bwc_mode;
-	struct mdss_mdp_pipe *pipe;
 
 	struct mutex lock;
 	u8 busy;
@@ -48,7 +46,6 @@ struct mdss_mdp_rotator_session {
 	bool use_sync_pt;
 	struct list_head head;
 	struct list_head list;
-	struct mdss_mdp_rotator_session *next;
 	struct msm_sync_pt_data *rot_sync_pt_data;
 	struct work_struct commit_work;
 };
@@ -92,4 +89,7 @@ struct msm_sync_pt_data *mdss_mdp_rotator_sync_pt_get(
 int mdss_mdp_rotator_play(struct msm_fb_data_type *mfd,
 			    struct msmfb_overlay_data *req);
 int mdss_mdp_rotator_unset(int ndx);
+
+int mdss_mdp_rot_mgr_init(void);
+
 #endif /* MDSS_MDP_ROTATOR_H */