disp: msm: add support to have same panel names for dual display

This change adds support to have same panel names for dual displays.
Without this change, the secondary panel bind will fail if it has the
same panel name as primary since the primary panel debugfs directory
would have been created during its display bind and when display bind
for secondary panel is initiated with the same name it will try to
create a debugfs directory with the same name resulting in bind failure.
This change appends a string as secondary in the panel name and creates the
debugfs directory.

Change-Id: I2bd25672ce0105a3b8225bbf17e13d4e373ad10b
Signed-off-by: Harigovindan P <harigovi@codeaurora.org>

msm/dsi/dsi_display.c

@@ -34,6 +34,8 @@
 #define DSI_CLOCK_BITRATE_RADIX 10
 #define MAX_TE_SOURCE_ID  2
 
+#define SEC_PANEL_NAME_MAX_LEN  256
+
 static char dsi_display_primary[MAX_CMDLINE_PARAM_LEN];
 static char dsi_display_secondary[MAX_CMDLINE_PARAM_LEN];
 static struct dsi_display_boot_param boot_displays[MAX_DSI_ACTIVE_DISPLAY] = {
@@ -1769,9 +1771,15 @@ static int dsi_display_debugfs_init(struct dsi_display *display)
 	int rc = 0;
 	struct dentry *dir, *dump_file, *misr_data;
 	char name[MAX_NAME_SIZE];
+	char panel_name[SEC_PANEL_NAME_MAX_LEN];
+	char secondary_panel_str[] = "_secondary";
 	int i;
 
-	dir = debugfs_create_dir(display->name, NULL);
+	strlcpy(panel_name, display->name, SEC_PANEL_NAME_MAX_LEN);
+	if (strcmp(display->display_type, "secondary") == 0)
+		strlcat(panel_name, secondary_panel_str, SEC_PANEL_NAME_MAX_LEN);
+
+	dir = debugfs_create_dir(panel_name, NULL);
 	if (IS_ERR_OR_NULL(dir)) {
 		rc = PTR_ERR(dir);
 		DSI_ERR("[%s] debugfs create dir failed, rc = %d\n",