dm: video: Add a temporary work-around for old stdout var

Boards with a saved environment may use 'lcd' in their stdout environment
variable, expecting that this will enable output to the LCD. When the board
moves to use driver model for video, this will no-longer work. Add a
work-around to fix this. A warning messages is printed, and we will remove
the work-around at the end of 2016.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Stephen Warren <swarren@nvidia.com>

common/console.c

@@ -650,6 +650,10 @@ struct stdio_dev *search_device(int flags, const char *name)
 	struct stdio_dev *dev;
 
 	dev = stdio_get_by_name(name);
+#ifdef CONFIG_VIDCONSOLE_AS_LCD
+	if (!dev && !strcmp(name, "lcd"))
+		dev = stdio_get_by_name("vidconsole");
+#endif
 
 	if (dev && (dev->flags & flags))
 		return dev;
@@ -795,6 +799,10 @@ done:
 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 	stdio_print_current_devices();
 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
+#ifdef CONFIG_VIDCONSOLE_AS_LCD
+	if (strstr(stdoutname, "lcd"))
+		printf("Warning: Please change 'lcd' to 'vidconsole' in stdout/stderr environment vars\n");
+#endif
 
 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 	/* set the environment variables (will overwrite previous env settings) */

drivers/video/Kconfig

@@ -91,6 +91,16 @@ config CONSOLE_TRUETYPE_SIZE
 
 source "drivers/video/fonts/Kconfig"
 
+config VIDCONSOLE_AS_LCD
+	bool "Use 'vidconsole' when 'lcd' is seen in stdout"
+	depends on DM_VIDEO
+	help
+	  This is a work-around for boards which have 'lcd' in their stdout
+	  environment variable, but have moved to use driver model for video.
+	  In this case the console will no-longer work. While it is possible
+	  to update the environment, the breakage may be confusing for users.
+	  This option will be removed around the end of 2016.
+
 config VIDEO_VESA
 	bool "Enable VESA video driver support"
 	default n