msm: mdss: add support for Early Clock Gating

Add support to gate the mdp clocks as soon as the
frame transfer is done for command mode panels.

Change-Id: I8325f26806ff3163edd87b9e3c01cd045f2aec77
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>
[cip@codeaurora.org: Resolved merge conflicts,
use debugfs_create_u32 for enable_gate]
Signed-off-by: Clarence Ip <cip@codeaurora.org>

drivers/video/fbdev/msm/mdss.h

@@ -336,6 +336,7 @@ struct mdss_data_type {
 	u32 *clock_levels;
 	u32 nclk_lvl;
 
+	u32 enable_gate;
 	u32 enable_bw_release;
 	u32 enable_rotator_bw_release;
 	u32 serialize_wait4pp;

drivers/video/fbdev/msm/mdss_fb.c

@@ -2878,6 +2878,8 @@ int mdss_fb_atomic_commit(struct fb_info *info,
 			__ioctl_transition_dyn_mode_state(mfd,
 				MSMFB_ATOMIC_COMMIT, 1);
 			ret = mfd->mdp.atomic_validate(mfd, file, commit_v1);
+			if (!ret)
+				mfd->validate_pending = true;
 		}
 		goto end;
 	} else {

drivers/video/fbdev/msm/mdss_fb.h

@@ -258,6 +258,8 @@ struct msm_fb_data_type {
 	int idle_time;
 	struct delayed_work idle_notify_work;
 
+	bool validate_pending;
+
 	int op_enable;
 	u32 fb_imgType;
 	int panel_reconfig;

drivers/video/fbdev/msm/mdss_mdp.c

@@ -872,8 +872,9 @@ void mdss_mdp_clk_ctrl(int enable)
 	if (changed)
 		MDSS_XLOG(mdp_clk_cnt, enable, current->pid);
 
-	pr_debug("%s: clk_cnt=%d changed=%d enable=%d\n",
-			__func__, mdp_clk_cnt, changed, enable);
+	pr_debug("%pS: clk_cnt=%d changed=%d enable=%d\n",
+			__builtin_return_address(0), mdp_clk_cnt,
+			changed, enable);
 
 	if (changed) {
 		if (enable) {
@@ -1106,6 +1107,8 @@ static void mdss_mdp_hw_rev_caps_init(struct mdss_data_type *mdata)
 	mdata->hflip_buffer_reused = true;
 	/* prevent disable of prefill calculations */
 	mdata->min_prefill_lines = 0xffff;
+	/* clock gating feature is disabled by default */
+	mdata->enable_gate = true;
 
 	mdss_mdp_hw_rev_debug_caps_init(mdata);
 

drivers/video/fbdev/msm/mdss_mdp.h

@@ -606,6 +606,7 @@ struct mdss_overlay_private {
 	struct list_head pipes_cleanup;
 	struct list_head rot_proc_list;
 	bool mixer_swap;
+	u32 resources_state;
 
 	/* list of buffers that can be reused */
 	struct list_head bufs_chunks;

drivers/video/fbdev/msm/mdss_mdp_ctl.c

@@ -1533,10 +1533,11 @@ void mdss_mdp_ctl_perf_set_transaction_status(struct mdss_mdp_ctl *ctl,
 	set_status(&ctl->perf_transaction_status, new_status,
 		(u32)component);
 
-	pr_debug("component:%d previous_transaction:%d transaction_status:%d\n",
-		component, previous_transaction, ctl->perf_transaction_status);
-	pr_debug("new_status:%d prev_status:%d\n",
-		new_status, previous_status);
+	pr_debug("ctl:%d component:%d previous:%d status:%d\n",
+		ctl->num, component, previous_transaction,
+		ctl->perf_transaction_status);
+	pr_debug("ctl:%d new_status:%d prev_status:%d\n",
+		ctl->num, new_status, previous_status);
 
 	spin_unlock_irqrestore(&ctl->spin_lock, flags);
 }
@@ -1580,6 +1581,8 @@ u32 mdss_mdp_ctl_perf_get_transaction_status(struct mdss_mdp_ctl *ctl)
 	spin_lock_irqsave(&ctl->spin_lock, flags);
 	transaction_status = ctl->perf_transaction_status;
 	spin_unlock_irqrestore(&ctl->spin_lock, flags);
+	pr_debug("ctl:%d status:%d\n", ctl->num,
+		transaction_status);
 
 	return transaction_status;
 }

drivers/video/fbdev/msm/mdss_mdp_debug.c

@@ -505,6 +505,8 @@ int mdss_mdp_debugfs_init(struct mdss_data_type *mdata)
 			&mdss_debugfs_stats_fops);
 	debugfs_create_u32("serialize_wait4pp", 0644, mdd->root,
 		(u32 *)&mdata->serialize_wait4pp);
+	debugfs_create_u32("enable_gate", 0644, mdd->root,
+		(u32 *)&mdata->enable_gate);
 
 	debugfs_create_u32("color0", 0644, mdd->bordercolor,
 		(u32 *)&mdata->bcolor0);

drivers/video/fbdev/msm/mdss_mdp_overlay.c

@@ -1936,6 +1936,13 @@ int mdss_mdp_overlay_kickoff(struct msm_fb_data_type *mfd,
 		ATRACE_END("display_commit");
 	}
 
+	/*
+	 * release the validate flag; we are releasing this flag
+	 * after the commit, since now the transaction status
+	 * in the cmd mode controllers is busy.
+	 */
+	mfd->validate_pending = false;
+
 	if ((!need_cleanup) && (!mdp5_data->kickoff_released))
 		mdss_mdp_ctl_notify(ctl, MDP_NOTIFY_FRAME_CTX_DONE);