disp: msm: dsi: Add support to enable LP11 insertion feature

Some panels may require that the DSI link returns to the low-power
stop state (LP11) after transmission of every line. If a panel
requires that the DSI link returns to LP11, apply the LP11
insertion between lines feature.

This change adds support to
 - Disable the command mdp burst mode
 - Enable mdp idle ctrl
 - Program the No. of dsi pclk cycles of idle time to
   insert between command mode mdp packets. The idle time
   must be long enough to cover the time link takes to
   switch between HS to LP11 mode.

Change-Id: Ie718d334f05ce6c1ecd1a05b379bbbe18dec6330
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>

msm/dsi/dsi_ctrl_hw_cmn.c

@@ -737,15 +737,23 @@ void dsi_ctrl_hw_cmn_cmd_engine_setup(struct dsi_ctrl_hw *ctrl,
 	reg |= cmd_mode_format_map[common_cfg->dst_format];
 	DSI_W32(ctrl, DSI_COMMAND_MODE_MDP_CTRL, reg);
 
-	reg = DSI_R32(ctrl, DSI_COMMAND_MODE_MDP_CTRL2);
+	if (!cfg->mdp_idle_ctrl_en) {
-	reg |= BIT(16);
+		reg = DSI_R32(ctrl, DSI_COMMAND_MODE_MDP_CTRL2);
-	DSI_W32(ctrl, DSI_COMMAND_MODE_MDP_CTRL2, reg);
+		reg |= BIT(16);
+		DSI_W32(ctrl, DSI_COMMAND_MODE_MDP_CTRL2, reg);
+	}
 
 	reg = cfg->wr_mem_start & 0xFF;
 	reg |= (cfg->wr_mem_continue & 0xFF) << 8;
 	reg |= (cfg->insert_dcs_command ? BIT(16) : 0);
 	DSI_W32(ctrl, DSI_COMMAND_MODE_MDP_DCS_CMD_CTRL, reg);
 
+	if (cfg->mdp_idle_ctrl_en) {
+		reg = cfg->mdp_idle_ctrl_len & 0x3FF;
+		reg |= BIT(12);
+		DSI_W32(ctrl, DSI_COMMAND_MODE_MDP_IDLE_CTRL, reg);
+	}
+
 	DSI_CTRL_HW_DBG(ctrl, "Cmd engine setup done\n");
 }
 

msm/dsi/dsi_defs.h

@@ -559,12 +559,17 @@ struct dsi_video_engine_cfg {
  * @wr_mem_continue:               DCS command for write_memory_continue.
  * @insert_dcs_command:            Insert DCS command as first byte of payload
  *                                 of the pixel data.
+ * @mdp_idle_ctrl_en:		Enable idle insertion between command mode mdp packets.
+ * @mdp_idle_ctrl_len:		No. of dsi pclk cycles of idle time to insert between
+ *				   command mode mdp packets.
  */
 struct dsi_cmd_engine_cfg {
 	u32 max_cmd_packets_interleave;
 	u32 wr_mem_start;
 	u32 wr_mem_continue;
 	bool insert_dcs_command;
+	bool mdp_idle_ctrl_en;
+	u32 mdp_idle_ctrl_len;
 };
 
 /**

msm/dsi/dsi_panel.c

@@ -1657,6 +1657,21 @@ static int dsi_panel_parse_cmd_host_config(struct dsi_cmd_engine_cfg *cfg,
 		goto error;
 	}
 
+	cfg->mdp_idle_ctrl_en =
+		utils->read_bool(utils->data, "qcom,mdss-dsi-mdp-idle-ctrl-en");
+
+	if (cfg->mdp_idle_ctrl_en) {
+		val = 0;
+		rc = utils->read_u32(utils->data, "qcom,mdss-dsi-mdp-idle-ctrl-len", &val);
+		if (rc) {
+			DSI_DEBUG("[%s] mdp idle ctrl len is not defined\n", name);
+			cfg->mdp_idle_ctrl_len = 0;
+			cfg->mdp_idle_ctrl_en = false;
+			rc = 0;
+		} else {
+			cfg->mdp_idle_ctrl_len = val;
+		}
+	}
 error:
 	return rc;
 }