video: fbdev: msm: add TWM mode sysfs node

Userspace SW will use this sysfs node to
notify TWM entry and exit.

Change-Id: I72730620ce7bca32439054e7ef3f17ae7fe29e19
Signed-off-by: Venkata Prahlad Valluru <vvalluru@codeaurora.org>

drivers/video/fbdev/msm/mdss.h

@@ -512,6 +512,7 @@ struct mdss_data_type {
 	u32 min_prefill_lines; /* this changes within different chipsets */
 	u32 props;
 
+	bool twm_en;
 	int handoff_pending;
 	bool idle_pc;
 	struct mdss_perf_tune perf_tune;

drivers/video/fbdev/msm/mdss_mdp.c

@@ -2889,13 +2889,55 @@ static ssize_t mdss_mdp_store_max_limit_bw(struct device *dev,
 	return len;
 }
 
+static ssize_t mdss_mdp_store_twm(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t len)
+{
+	struct mdss_data_type *mdata = mdss_mdp_get_mdata();
+	u32 data = -1;
+	ssize_t rc = 0;
+
+	if (!mdata) {
+		pr_err("Invalid mdata structure\n");
+		return -EINVAL;
+	}
+
+	rc = kstrtoint(buf, 10, &data);
+	if (rc) {
+		pr_err("kstrtoint failed. rc=%zd\n", rc);
+		return rc;
+	}
+	mdata->twm_en = data ? true : false;
+	pr_err("TWM :  %s\n", (mdata->twm_en) ?
+		"ENABLED" : "DISABLED");
+	return len;
+}
+
+static ssize_t mdss_mdp_show_twm(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct mdss_data_type *mdata = mdss_mdp_get_mdata();
+	ssize_t ret = 0;
+
+	if (!mdata) {
+		pr_err("Invalid mdata structure\n");
+		return -EINVAL;
+	}
+
+	pr_err("TWM :  %s\n", (mdata->twm_en) ?
+		"ENABLED" : "DISABLED");
+	ret = snprintf(buf, PAGE_SIZE, "%d\n", mdata->twm_en);
+	return ret;
+}
+
 static DEVICE_ATTR(caps, 0444, mdss_mdp_show_capabilities, NULL);
 static DEVICE_ATTR(bw_mode_bitmap, 0664,
 		mdss_mdp_read_max_limit_bw, mdss_mdp_store_max_limit_bw);
+static DEVICE_ATTR(twm_enable, 0664, mdss_mdp_show_twm, mdss_mdp_store_twm);
 
 static struct attribute *mdp_fs_attrs[] = {
 	&dev_attr_caps.attr,
 	&dev_attr_bw_mode_bitmap.attr,
+	&dev_attr_twm_enable.attr,
 	NULL
 };
 

drivers/video/fbdev/msm/mdss_mdp_overlay.c

@@ -6422,6 +6422,13 @@ static void mdss_mdp_signal_retire_fence(struct msm_fb_data_type *mfd,
 	pr_debug("Signaled (%d) pending retire fence\n", retire_cnt);
 }
 
+static bool mdss_mdp_is_twm_en(void)
+{
+	struct mdss_data_type *mdata = mdss_mdp_get_mdata();
+
+	return (mdata && mdata->twm_en);
+}
+
 int mdss_mdp_overlay_init(struct msm_fb_data_type *mfd)
 {
 	struct device *dev = mfd->fbi->dev;
@@ -6464,7 +6471,7 @@ int mdss_mdp_overlay_init(struct msm_fb_data_type *mfd)
 	mdp5_interface->signal_retire_fence = mdss_mdp_signal_retire_fence;
 	mdp5_interface->enable_panel_disable_mode =
 		mdss_mdp_enable_panel_disable_mode;
-	mdp5_interface->is_twm_en = NULL;
+	mdp5_interface->is_twm_en = mdss_mdp_is_twm_en;
 
 	/*
 	 * Register footswitch control only for primary fb pm