msm: mdss: support panel topology configurations using module params

Starting patch I36dbf8d9e325675bb3affa1794b2fc93ee6151b4,
msm: mdss: enable different panel configuration modes, dsi panels can
have multiple topology configurations. Currently chosen configuration
is selected only through device tree using qcom,config-select property.
Add support to override this configuration using existing module param.
This module param can be changed by boot-loader display driver if present
or directly by user through kernel command line.

New module param usage:
panel=<lk_cfg>:<pan_intf>:<pan_intf_cfg>:<panel_topology_cfg>
where
<lk_cfg> = "1" lk/gcdb config or "0" non-lk/non-gcdb config;
<pan_intf> = dsi:<ctrl_id> or hdmi or edp;
<pan_intf_cfg> = panel interface specific string matching dt node name;
<panel_topology_cfg> = Optional. If used, format is "config%d";

Ex: panel=0:dsi:1:qcom,mdss_dsi_nt35597_dsc_wqxga_video:config2:0:none
    panel=0:dsi:0:qcom,mdss_dsi_nt35597_wqxga_cmd:config1:1:
          qcom,mdss_dsi_nt35597_wqxga_cmd:config1:cfg:split_dsi

Change-Id: I583ee801737282d3a0eb189e1bf8d66dd7a9b480
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>

drivers/video/fbdev/msm/mdss_dsi.c

@@ -32,6 +32,7 @@
 #include "mdss_debug.h"
 
 #define XO_CLK_RATE	19200000
+#define CMDLINE_DSI_CTL_NUM_STRING_LEN 2
 
 /* Master structure to hold all the information about the DSI/panel */
 static struct mdss_dsi_data *mdss_dsi_res;
@@ -2210,11 +2211,12 @@ static struct device_node *mdss_dsi_pref_prim_panel(
 static struct device_node *mdss_dsi_find_panel_of_node(
 		struct platform_device *pdev, char *panel_cfg)
 {
-	int len, i;
+	int len, i = 0;
 	int ctrl_id = pdev->id - 1;
 	char panel_name[MDSS_MAX_PANEL_LEN] = "";
 	char ctrl_id_stream[3] =  "0:";
-	char *stream = NULL, *pan = NULL, *override_cfg = NULL;
+	char *str1 = NULL, *str2 = NULL, *override_cfg = NULL;
+	char cfg_np_name[MDSS_MAX_PANEL_LEN] = "";
 	struct device_node *dsi_pan_node = NULL, *mdss_node = NULL;
 	struct mdss_dsi_ctrl_pdata *ctrl_pdata = platform_get_drvdata(pdev);
 	struct mdss_panel_info *pinfo = &ctrl_pdata->panel_data.panel_info;
@@ -2240,46 +2242,85 @@ static struct device_node *mdss_dsi_find_panel_of_node(
 		if (ctrl_id == 1)
 			strlcpy(ctrl_id_stream, "1:", 3);
 
-		stream = strnstr(panel_cfg, ctrl_id_stream, len);
-		if (!stream) {
-			pr_err("controller config is not present\n");
+		/* get controller number */
+		str1 = strnstr(panel_cfg, ctrl_id_stream, len);
+		if (!str1) {
+			pr_err("%s: controller %s is not present in %s\n",
+				__func__, ctrl_id_stream, panel_cfg);
 			goto end;
 		}
-		stream += 2;
+		if ((str1 != panel_cfg) && (*(str1-1) != ':')) {
+			str1 += CMDLINE_DSI_CTL_NUM_STRING_LEN;
+			pr_debug("false match with config node name in \"%s\". search again in \"%s\"\n",
+				panel_cfg, str1);
+			str1 = strnstr(str1, ctrl_id_stream, len);
+			if (!str1) {
+				pr_err("%s: 2. controller %s is not present in %s\n",
+					__func__, ctrl_id_stream, str1);
+				goto end;
+			}
+		}
+		str1 += CMDLINE_DSI_CTL_NUM_STRING_LEN;
 
-		pan = strnchr(stream, strlen(stream), ':');
-		if (!pan) {
-			strlcpy(panel_name, stream, MDSS_MAX_PANEL_LEN);
+		/* get panel name */
+		str2 = strnchr(str1, strlen(str1), ':');
+		if (!str2) {
+			strlcpy(panel_name, str1, MDSS_MAX_PANEL_LEN);
 		} else {
-			for (i = 0; (stream + i) < pan; i++)
-				panel_name[i] = *(stream + i);
+			for (i = 0; (str1 + i) < str2; i++)
+				panel_name[i] = *(str1 + i);
 			panel_name[i] = 0;
 		}
-
-		pr_debug("%s:%d:%s:%s\n", __func__, __LINE__,
-			 panel_cfg, panel_name);
+		pr_info("%s: cmdline:%s panel_name:%s\n",
+			__func__, panel_cfg, panel_name);
+		if (!strcmp(panel_name, NONE_PANEL))
+			goto exit;
 
 		mdss_node = of_parse_phandle(pdev->dev.of_node,
-					     "qcom,mdss-mdp", 0);
-
+			"qcom,mdss-mdp", 0);
 		if (!mdss_node) {
 			pr_err("%s: %d: mdss_node null\n",
 			       __func__, __LINE__);
 			return NULL;
 		}
-		dsi_pan_node = of_find_node_by_name(mdss_node,
-						    panel_name);
+		dsi_pan_node = of_find_node_by_name(mdss_node, panel_name);
 		if (!dsi_pan_node) {
-			pr_err("%s: invalid pan node, selecting prim panel\n",
-			       __func__);
+			pr_err("%s: invalid pan node \"%s\"\n",
+			       __func__, panel_name);
 			goto end;
+		} else {
+			/* extract config node name if present */
+			str1 += i;
+			str2 = strnstr(str1, "config", strlen(str1));
+			if (str2) {
+				str1 = strnchr(str2, strlen(str2), ':');
+				if (str1) {
+					for (i = 0; ((str2 + i) < str1) &&
+					     i < MDSS_MAX_PANEL_LEN; i++)
+						cfg_np_name[i] = *(str2 + i);
+					cfg_np_name[i] = 0;
+				} else {
+					strlcpy(cfg_np_name, str2,
+						MDSS_MAX_PANEL_LEN);
+				}
+			}
+
+			pr_debug("%s: cfg_np_name:%s\n", __func__, cfg_np_name);
+			if (str2) {
+				ctrl_pdata->panel_data.cfg_np =
+					of_get_child_by_name(dsi_pan_node,
+					cfg_np_name);
+				if (!ctrl_pdata->panel_data.cfg_np)
+					pr_warn("%s: can't find config node:%s. either no such node or bad name\n",
+						__func__, cfg_np_name);
+			}
 		}
 		return dsi_pan_node;
 	}
 end:
 	if (strcmp(panel_name, NONE_PANEL))
 		dsi_pan_node = mdss_dsi_pref_prim_panel(pdev);
-
+exit:
 	return dsi_pan_node;
 }
 
@@ -2853,11 +2894,15 @@ static int mdss_dsi_parse_hw_cfg(struct platform_device *pdev, char *pan_cfg)
 		cfg_prim = strnstr(pan_cfg, "cfg:", strlen(pan_cfg));
 	if (cfg_prim) {
 		cfg_prim += 4;
+
 		cfg_sec = strnchr(cfg_prim, strlen(cfg_prim), ':');
 		if (!cfg_sec)
 			cfg_sec = cfg_prim + strlen(cfg_prim);
-		for (i = 0; (cfg_prim + i) < cfg_sec; i++)
+
+		for (i = 0; ((cfg_prim + i) < cfg_sec) &&
+		     (*(cfg_prim+i) != '#'); i++)
 			dsi_cfg[i] = *(cfg_prim + i);
+
 		dsi_cfg[i] = '\0';
 		data = dsi_cfg;
 	} else {

drivers/video/fbdev/msm/mdss_dsi_panel.c

@@ -1374,6 +1374,11 @@ static int mdss_dsi_parse_dsc_params(struct device_node *np,
 	int rc = 0;
 	struct dsc_desc *dsc = &timing->dsc;
 
+	if (!np) {
+		pr_err("%s: device node pointer is NULL\n", __func__);
+		return -EINVAL;
+	}
+
 	rc = of_property_read_u32(np, "qcom,mdss-dsc-encoders", &data);
 	if (rc) {
 		if (!of_find_property(np, "qcom,mdss-dsc-encoders", NULL)) {
@@ -1471,32 +1476,40 @@ end:
 }
 
 static int mdss_dsi_parse_compression_params(struct device_node *np,
-	struct dsi_panel_timing *pt, bool is_split_display)
+	struct dsi_panel_timing *pt, struct mdss_panel_data *panel_data)
 {
 	int rc = 0;
+	bool is_split_display = panel_data->panel_info.is_split_display;
 	const char *data;
-	struct device_node *cfg_np = NULL;
 	struct mdss_panel_timing *timing = &pt->timing;
+	struct mdss_dsi_ctrl_pdata *ctrl_pdata = NULL;
+	struct device_node *cfg_np;
 
-	if (of_find_property(np, "qcom,config-select", NULL)) {
+	ctrl_pdata = container_of(panel_data, struct mdss_dsi_ctrl_pdata,
+							panel_data);
+	cfg_np = ctrl_pdata->panel_data.cfg_np;
+
+	if (!cfg_np && of_find_property(np, "qcom,config-select", NULL)) {
 		cfg_np = of_parse_phandle(np, "qcom,config-select", 0);
-		if (!cfg_np) {
-			pr_err("%s: error parsing qcom,config-select\n",
-				__func__);
-		} else {
-			if (!of_property_read_u32_array(cfg_np, "qcom,lm-split",
-			    timing->lm_widths, 2)) {
-				if (is_split_display &&
-				    (timing->lm_widths[1] != 0)) {
-					pr_err("%s: lm-split not allowed with split display\n",
-						__func__);
-					rc = -EINVAL;
-					goto end;
-				}
+		if (!cfg_np)
+			pr_err("%s:err parsing qcom,config-select\n", __func__);
+		ctrl_pdata->panel_data.cfg_np = cfg_np;
+	}
+
+	if (cfg_np) {
+		if (!of_property_read_u32_array(cfg_np, "qcom,lm-split",
+		    timing->lm_widths, 2)) {
+			if (mdss_dsi_is_hw_config_split(ctrl_pdata->shared_data)
+			    && (timing->lm_widths[1] != 0)) {
+				pr_err("%s: lm-split not allowed with split display\n",
+					__func__);
+				rc = -EINVAL;
+				goto end;
 			}
 		}
-	} else {
-		pr_debug("%s: qcom,config-select is not present\n", __func__);
+		pr_info("%s: cfg_node name %s lm_split:%dx%d\n", __func__,
+			cfg_np->name,
+			timing->lm_widths[0], timing->lm_widths[1]);
 	}
 
 	if ((timing->lm_widths[0] == 0) && (timing->lm_widths[1] == 0))
@@ -2225,7 +2238,7 @@ static int  mdss_dsi_panel_config_res_properties(struct device_node *np,
 		"qcom,mdss-dsi-timing-switch-command-state");
 
 	rc = mdss_dsi_parse_compression_params(np, pt,
-			panel_data->panel_info.is_split_display);
+			panel_data);
 	if (rc) {
 		pr_err("%s: parsing compression params failed. rc:%d\n",
 			__func__, rc);

drivers/video/fbdev/msm/mdss_mdp.c

@@ -4144,12 +4144,17 @@ static int __init mdss_mdp_driver_init(void)
 
 module_param_string(panel, mdss_mdp_panel, MDSS_MAX_PANEL_LEN, 0);
 MODULE_PARM_DESC(panel,
-		"panel=<lk_cfg>:<pan_intf>:<pan_intf_cfg> "
+		"panel=<lk_cfg>:<pan_intf>:<pan_intf_cfg>:<panel_topology_cfg> "
 		"where <lk_cfg> is "1"-lk/gcdb config or "0" non-lk/non-gcdb "
 		"config; <pan_intf> is dsi:<ctrl_id> or hdmi or edp "
 		"<pan_intf_cfg> is panel interface specific string "
 		"Ex: This string is panel's device node name from DT "
 		"for DSI interface "
-		"hdmi/edp interface does not use this string");
+		"hdmi/edp interface does not use this string "
+		"<panel_topology_cfg> is an optional string. Currently it is "
+		"only valid for DSI panels. In dual-DSI case, it needs to be"
+		"used on both panels or none. When used, format is config%d "
+		"where %d is one of the configuration found in device node of "
+		"panel selected by <pan_intf_cfg>");
 
 module_init(mdss_mdp_driver_init);

drivers/video/fbdev/msm/mdss_panel.h

@@ -14,6 +14,7 @@
 #ifndef MDSS_PANEL_H
 #define MDSS_PANEL_H
 
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/stringify.h>
 #include <linux/types.h>
@@ -689,6 +690,7 @@ struct mdss_panel_data {
 	struct mdss_panel_timing *current_timing;
 	bool active;
 
+	struct device_node *cfg_np; /* NULL if config node is not present */
 	struct mdss_panel_data *next;
 };