msm: mdss: add ESD support by register read for DSI v2

Add support to check ESD status by register read for
DSI v2 based platforms.

Change-Id: I013d31c67b3e5c61b7723ecb234be06c2fd5a451
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>

drivers/video/fbdev/msm/dsi_host_v2.c

@@ -1288,6 +1288,82 @@ error_vreg:
 	return ret;
 }
 
+static int msm_dsi_read_status(struct mdss_dsi_ctrl_pdata *ctrl)
+{
+	struct dcs_cmd_req cmdreq;
+
+	memset(&cmdreq, 0, sizeof(cmdreq));
+	cmdreq.cmds = ctrl->status_cmds.cmds;
+	cmdreq.cmds_cnt = ctrl->status_cmds.cmd_cnt;
+	cmdreq.flags = CMD_REQ_COMMIT | CMD_CLK_CTRL | CMD_REQ_RX;
+	cmdreq.rlen = 1;
+	cmdreq.cb = NULL;
+	cmdreq.rbuf = ctrl->status_buf.data;
+
+	return mdss_dsi_cmdlist_put(ctrl, &cmdreq);
+}
+
+
+/**
+ * msm_dsi_reg_status_check() - Check dsi panel status through reg read
+ * @ctrl_pdata: pointer to the dsi controller structure
+ *
+ * This function can be used to check the panel status through reading the
+ * status register from the panel.
+ *
+ * Return: positive value if the panel is in good state, negative value or
+ * zero otherwise.
+ */
+int msm_dsi_reg_status_check(struct mdss_dsi_ctrl_pdata *ctrl_pdata)
+{
+	int ret = 0;
+
+	if (ctrl_pdata == NULL) {
+		pr_err("%s: Invalid input data\n", __func__);
+		return 0;
+	}
+
+	pr_debug("%s: Checking Register status\n", __func__);
+
+	msm_dsi_clk_ctrl(&ctrl_pdata->panel_data, 1);
+
+	if (ctrl_pdata->status_cmds.link_state == DSI_HS_MODE)
+		dsi_set_tx_power_mode(0);
+
+	ret = msm_dsi_read_status(ctrl_pdata);
+
+	if (ctrl_pdata->status_cmds.link_state == DSI_HS_MODE)
+		dsi_set_tx_power_mode(1);
+
+	if (ret == 0) {
+		if (ctrl_pdata->status_buf.data[0] !=
+						ctrl_pdata->status_value) {
+			pr_err("%s: Read back value from panel is incorrect\n",
+								__func__);
+			ret = -EINVAL;
+		} else {
+			ret = 1;
+		}
+	} else {
+		pr_err("%s: Read status register returned error\n", __func__);
+	}
+
+	msm_dsi_clk_ctrl(&ctrl_pdata->panel_data, 0);
+	pr_debug("%s: Read register done with ret: %d\n", __func__, ret);
+
+	return ret;
+}
+
+/**
+ * msm_dsi_bta_status_check() - Check dsi panel status through bta check
+ * @ctrl_pdata: pointer to the dsi controller structure
+ *
+ * This function can be used to check status of the panel using bta check
+ * for the panel.
+ *
+ * Return: positive value if the panel is in good state, negative value or
+ * zero otherwise.
+ */
 static int msm_dsi_bta_status_check(struct mdss_dsi_ctrl_pdata *ctrl_pdata)
 {
 	int ret = 0;
@@ -1503,9 +1579,19 @@ void msm_dsi_ctrl_init(struct mdss_dsi_ctrl_pdata *ctrl)
 	complete(&ctrl->mdp_comp);
 	dsi_buf_alloc(&ctrl->tx_buf, SZ_4K);
 	dsi_buf_alloc(&ctrl->rx_buf, SZ_4K);
+	dsi_buf_alloc(&ctrl->status_buf, SZ_4K);
 	ctrl->cmdlist_commit = msm_dsi_cmdlist_commit;
 	ctrl->panel_mode = ctrl->panel_data.panel_info.mipi.mode;
-	ctrl->check_status = msm_dsi_bta_status_check;
+
+	if (ctrl->status_mode == ESD_REG)
+		ctrl->check_status = msm_dsi_reg_status_check;
+	else if (ctrl->status_mode == ESD_BTA)
+		ctrl->check_status = msm_dsi_bta_status_check;
+
+	if (ctrl->status_mode == ESD_MAX) {
+		pr_err("%s: Using default BTA for ESD check\n", __func__);
+		ctrl->check_status = msm_dsi_bta_status_check;
+	}
 }
 
 static int msm_dsi_probe(struct platform_device *pdev)