msm: mdss: dsi: Add dsi event to reset panel write pointer

There are instances where the mdp wants to reset to full screen
especially during frame timeouts. Add event to s/w reset the dsi core
and reset the panel's ram write coordinates to full screen.

Change-Id: I43e5cb12126837330f3ed72386f87f5c7fabd2c0
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>

drivers/video/fbdev/msm/mdss_dsi.c

@@ -1805,11 +1805,14 @@ static int mdss_dsi_ctl_partial_roi(struct mdss_panel_data *pdata)
 		return -EINVAL;
 	}
 
+	if (!pdata->panel_info.partial_update_enabled)
+		return 0;
+
 	ctrl_pdata = container_of(pdata, struct mdss_dsi_ctrl_pdata,
 				panel_data);
 
 	if (ctrl_pdata->set_col_page_addr)
-		rc = ctrl_pdata->set_col_page_addr(pdata);
+		rc = ctrl_pdata->set_col_page_addr(pdata, false);
 
 	return rc;
 }
@@ -1882,6 +1885,56 @@ static int mdss_dsi_set_stream_size(struct mdss_panel_data *pdata)
 	return 0;
 }
 
+static int mdss_dsi_reset_write_ptr(struct mdss_panel_data *pdata)
+{
+
+	struct mdss_dsi_ctrl_pdata *ctrl_pdata = NULL;
+	struct mdss_panel_info *pinfo;
+	int rc = 0;
+
+	if (pdata == NULL) {
+		pr_err("%s: Invalid input data\n", __func__);
+		return -EINVAL;
+	}
+
+	ctrl_pdata = container_of(pdata, struct mdss_dsi_ctrl_pdata,
+			panel_data);
+
+	pinfo = &ctrl_pdata->panel_data.panel_info;
+	mdss_dsi_clk_ctrl(ctrl_pdata, DSI_ALL_CLKS, 1);
+	/* Need to reset the DSI core since the pixel stream was stopped. */
+	mdss_dsi_sw_reset(ctrl_pdata, true);
+
+	/*
+	 * Reset the partial update co-ordinates to the panel height and
+	 * width
+	 */
+	if (pinfo->dcs_cmd_by_left && (ctrl_pdata->ndx == 1))
+		goto skip_cmd_send;
+
+	pinfo->roi.x = 0;
+	pinfo->roi.y = 0;
+	pinfo->roi.w = pinfo->xres;
+	if (pinfo->dcs_cmd_by_left)
+		pinfo->roi.w = pinfo->xres;
+	if (pdata->next)
+		pinfo->roi.w += pdata->next->panel_info.xres;
+	pinfo->roi.h = pinfo->yres;
+
+	mdss_dsi_set_stream_size(pdata);
+
+	if (ctrl_pdata->set_col_page_addr)
+		rc = ctrl_pdata->set_col_page_addr(pdata, true);
+
+skip_cmd_send:
+	mdss_dsi_clk_ctrl(ctrl_pdata, DSI_ALL_CLKS, 0);
+
+	pr_debug("%s: DSI%d write ptr reset finished\n", __func__,
+			ctrl_pdata->ndx);
+
+	return rc;
+}
+
 int mdss_dsi_register_recovery_handler(struct mdss_dsi_ctrl_pdata *ctrl,
 	struct mdss_intf_recovery *recovery)
 {
@@ -2001,6 +2054,9 @@ static int mdss_dsi_event_handler(struct mdss_panel_data *pdata,
 	case MDSS_EVENT_ENABLE_PARTIAL_ROI:
 		rc = mdss_dsi_ctl_partial_roi(pdata);
 		break;
+	case MDSS_EVENT_DSI_RESET_WRITE_PTR:
+		rc = mdss_dsi_reset_write_ptr(pdata);
+		break;
 	case MDSS_EVENT_DSI_STREAM_SIZE:
 		rc = mdss_dsi_set_stream_size(pdata);
 		break;

drivers/video/fbdev/msm/mdss_dsi.h

@@ -348,7 +348,7 @@ struct mdss_dsi_ctrl_pdata {
 	int (*post_panel_on)(struct mdss_panel_data *pdata);
 	int (*off) (struct mdss_panel_data *pdata);
 	int (*low_power_config) (struct mdss_panel_data *pdata, int enable);
-	int (*set_col_page_addr) (struct mdss_panel_data *pdata);
+	int (*set_col_page_addr)(struct mdss_panel_data *pdata, bool force);
 	int (*check_status) (struct mdss_dsi_ctrl_pdata *pdata);
 	int (*check_read_status) (struct mdss_dsi_ctrl_pdata *pdata);
 	int (*cmdlist_commit)(struct mdss_dsi_ctrl_pdata *ctrl, int from_mdp);

drivers/video/fbdev/msm/mdss_dsi_host.c

@@ -436,6 +436,7 @@ void mdss_dsi_set_tx_power_mode(int mode, struct mdss_panel_data *pdata)
 void mdss_dsi_sw_reset(struct mdss_dsi_ctrl_pdata *ctrl, bool restore)
 {
 	u32 data0;
+	unsigned long flag;
 
 	if (!ctrl) {
 		pr_err("%s: Invalid input data\n", __func__);
@@ -464,6 +465,12 @@ void mdss_dsi_sw_reset(struct mdss_dsi_ctrl_pdata *ctrl, bool restore)
 		MIPI_OUTP(ctrl->ctrl_base + 0x0004, data0);
 		wmb();	/* make sure dsi controller enabled again */
 	}
+
+	/* It is safe to clear mdp_busy as reset is happening */
+	spin_lock_irqsave(&ctrl->mdp_lock, flag);
+	ctrl->mdp_busy = false;
+	complete_all(&ctrl->mdp_comp);
+	spin_unlock_irqrestore(&ctrl->mdp_lock, flag);
 }
 
 static void mdss_dsi_cfg_lane_ctrl(struct mdss_dsi_ctrl_pdata *ctrl,

drivers/video/fbdev/msm/mdss_dsi_panel.c

@@ -448,7 +448,8 @@ static void mdss_dsi_send_col_page_addr(struct mdss_dsi_ctrl_pdata *ctrl,
 	mdss_dsi_cmdlist_put(ctrl, &cmdreq);
 }
 
-static int mdss_dsi_set_col_page_addr(struct mdss_panel_data *pdata)
+static int mdss_dsi_set_col_page_addr(struct mdss_panel_data *pdata,
+		bool force_send)
 {
 	struct mdss_panel_info *pinfo;
 	struct mdss_rect roi = {0};
@@ -487,7 +488,7 @@ static int mdss_dsi_set_col_page_addr(struct mdss_panel_data *pdata)
 	}
 
 	/* roi had changed, do col_page update */
-	if (!mdss_rect_cmp(c_roi, &roi)) {
+	if (force_send || !mdss_rect_cmp(c_roi, &roi)) {
 		pr_debug("%s: ndx=%d x=%d y=%d w=%d h=%d\n",
 				__func__, ctrl->ndx, p_roi->x,
 				p_roi->y, p_roi->w, p_roi->h);
@@ -1572,8 +1573,8 @@ static int mdss_dsi_parse_panel_features(struct device_node *np,
 		pinfo->partial_update_enabled = pinfo->partial_update_supported;
 		pr_info("%s: partial_update_enabled=%d\n", __func__,
 					pinfo->partial_update_enabled);
+		ctrl->set_col_page_addr = mdss_dsi_set_col_page_addr;
 		if (pinfo->partial_update_enabled) {
-			ctrl->set_col_page_addr = mdss_dsi_set_col_page_addr;
 			pinfo->partial_update_roi_merge =
 					of_property_read_bool(np,
 					"qcom,partial-update-roi-merge");

drivers/video/fbdev/msm/mdss_mdp_ctl.c

@@ -4206,6 +4206,9 @@ int mdss_mdp_display_wait4pingpong(struct mdss_mdp_ctl *ctl, bool use_lock)
 		if (sctl)
 			mdss_mdp_ctl_reset(sctl);
 
+		mdss_mdp_ctl_intf_event(ctl,
+				MDSS_EVENT_DSI_RESET_WRITE_PTR, NULL);
+
 		pr_debug("pingpong timeout recovery finished\n");
 	}
 

drivers/video/fbdev/msm/mdss_panel.h

@@ -214,6 +214,8 @@ struct mdss_intf_recovery {
  * @MDSS_EVENT_DSI_RECONFIG_CMD: Setup DSI controller in new mode
  *				- MIPI_VIDEO_PANEL: switch to video mode
  *				- MIPI_CMD_PANEL: switch to command mode
+ * @MDSS_EVENT_DSI_RESET_WRITE_PTR: Reset the write pointer coordinates on
+ *				the panel.
  */
 enum mdss_intf_events {
 	MDSS_EVENT_RESET = 1,
@@ -240,6 +242,7 @@ enum mdss_intf_events {
 	MDSS_EVENT_DSI_PANEL_STATUS,
 	MDSS_EVENT_DSI_DYNAMIC_SWITCH,
 	MDSS_EVENT_DSI_RECONFIG_CMD,
+	MDSS_EVENT_DSI_RESET_WRITE_PTR,
 };
 
 struct lcd_panel_info {