msm: mdss: add idle state node

Add a helper node that can be used to notify user space through sysfs
node when fb device has not had any activity for a specified amount of
time (through idle_time node).

Bug: 62110101
Change-Id: I4dfa4b1a376149aa55a940dad7ac336ec99f1af8
Signed-off-by: Adrian Salido <salidoa@google.com>

1 files changed, 38 insertions, 7 deletions

diff --git a/drivers/video/fbdev/msm/mdss_fb.c b/drivers/video/fbdev/msm/mdss_fb.c
index 8a45081d3a13..ee5f15664fd3 100644
--- a/drivers/video/fbdev/msm/mdss_fb.c
+++ b/drivers/video/fbdev/msm/mdss_fb.c
@@ -527,12 +527,17 @@ static void __mdss_fb_idle_notify_work(struct work_struct *work)
 
 	/* Notify idle-ness here */
 	pr_debug("Idle timeout %dms expired!\n", mfd->idle_time);
-	if (mfd->idle_time)
-		sysfs_notify(&mfd->fbi->dev->kobj, NULL, "idle_notify");
+
 	mfd->idle_state = MDSS_FB_IDLE;
+	/*
+	 * idle_notify node events are used to reduce MDP load when idle,
+	 * this is not needed for command mode panels.
+	 */
+	if (mfd->idle_time && mfd->panel.type != MIPI_CMD_PANEL)
+		sysfs_notify(&mfd->fbi->dev->kobj, NULL, "idle_notify");
+	sysfs_notify(&mfd->fbi->dev->kobj, NULL, "idle_state");
 }
 
-
 static ssize_t mdss_fb_get_fps_info(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -593,6 +598,26 @@ static ssize_t mdss_fb_get_idle_notify(struct device *dev,
 	return ret;
 }
 
+static ssize_t mdss_fb_get_idle_state(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fb_info *fbi = dev_get_drvdata(dev);
+	struct msm_fb_data_type *mfd = fbi->par;
+	const char *state_strs[] = {
+		[MDSS_FB_NOT_IDLE] = "active",
+		[MDSS_FB_IDLE_TIMER_RUNNING] = "pending",
+		[MDSS_FB_IDLE] = "idle",
+	};
+	int state = mfd->idle_state;
+	const char *s;
+	if (state < ARRAY_SIZE(state_strs) && state_strs[state])
+		s = state_strs[state];
+	else
+		s = "invalid";
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", s);
+}
+
 static ssize_t mdss_fb_get_panel_info(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -929,6 +954,7 @@ static DEVICE_ATTR(show_blank_event, S_IRUGO, mdss_mdp_show_blank_event, NULL);
 static DEVICE_ATTR(idle_time, S_IRUGO | S_IWUSR | S_IWGRP,
 	mdss_fb_get_idle_time, mdss_fb_set_idle_time);
 static DEVICE_ATTR(idle_notify, S_IRUGO, mdss_fb_get_idle_notify, NULL);
+static DEVICE_ATTR(idle_state, S_IRUGO, mdss_fb_get_idle_state, NULL);
 static DEVICE_ATTR(msm_fb_panel_info, S_IRUGO, mdss_fb_get_panel_info, NULL);
 static DEVICE_ATTR(msm_fb_src_split_info, S_IRUGO, mdss_fb_get_src_split_info,
 	NULL);
@@ -950,6 +976,7 @@ static struct attribute *mdss_fb_attrs[] = {
 	&dev_attr_show_blank_event.attr,
 	&dev_attr_idle_time.attr,
 	&dev_attr_idle_notify.attr,
+	&dev_attr_idle_state.attr,
 	&dev_attr_msm_fb_panel_info.attr,
 	&dev_attr_msm_fb_src_split_info.attr,
 	&dev_attr_msm_fb_thermal_level.attr,
@@ -3143,14 +3170,18 @@ static int __mdss_fb_sync_buf_done_callback(struct notifier_block *p,
 			ret = __mdss_fb_wait_for_fence_sub(sync_pt_data,
 				sync_pt_data->temp_fen, fence_cnt);
 		}
-		if (mfd->idle_time && !mod_delayed_work(system_wq,
+		if (mfd->idle_time) {
+			if (!mod_delayed_work(system_wq,
 					&mfd->idle_notify_work,
 					msecs_to_jiffies(mfd->idle_time)))
-			pr_debug("fb%d: restarted idle work\n",
-					mfd->index);
+				pr_debug("fb%d: restarted idle work\n",
+						mfd->index);
+			mfd->idle_state = MDSS_FB_IDLE_TIMER_RUNNING;
+		} else {
+			mfd->idle_state = MDSS_FB_IDLE;
+		}
 		if (ret == -ETIME)
 			ret = NOTIFY_BAD;
-		mfd->idle_state = MDSS_FB_IDLE_TIMER_RUNNING;
 		break;
 	case MDP_NOTIFY_FRAME_FLUSHED:
 		pr_debug("%s: frame flushed\n", sync_pt_data->fence_name);