[U-Boot] [PATCH 2/5] lcd: add option for board specific splash screen preparation

[Nikita Kiryanov]

Currently there is no logical place to put the code that prepares the
splash image data. The splash image data should be ready in memory
before bmp_display() is called, and after the environment is ready
(since lcd.c looks for the splash image in an address specified by
the environment variable "splashimage").

Our window of opportunity in board_init_r() is therefore: between
env_relocate() and bmp_display(), and from the available options
only the lcd related functions in drv_lcd_init() seem appropriate
for such lcd oriented code.

Add the option to prepare the splash image data in lcd_logo() right
before it is sent to be displayed.

Signed-off-by: Nikita Kiryanov <nikita at compulab.co.il>
Signed-off-by: Igor Grinberg <grinberg at compulab.co.il>
---
 README        |    8 ++++++++
 common/lcd.c  |   15 +++++++++++++++
 include/lcd.h |    1 +
 3 files changed, 24 insertions(+)

diff --git a/README b/README
index 78f40df..cffc016 100644
--- a/README
+++ b/README
@@ -1541,6 +1541,14 @@ CBFS (Coreboot Filesystem) support
 			=> vertically centered image
 			   at x = dspWidth - bmpWidth - 9
 
+		CONFIG_SPLASH_SCREEN_PREPARE
+
+		If this option is set then the board_splash_screen_prepare()
+		function, which must be defined in your code, is called as part
+		of the splash screen display sequence. It gives the board an
+		opportunity to prepare the splash image data before it is
+		processed and sent to the frame buffer by U-Boot.
+
 - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
 
 		If this option is set, additionally to standard BMP
diff --git a/common/lcd.c b/common/lcd.c
index 66d4f94..129cf7e 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -1034,6 +1034,18 @@ int lcd_display_bitmap(ulong bmp_image, int x, int y)
 }
 #endif
 
+#ifdef CONFIG_SPLASH_SCREEN_PREPARE
+static inline int splash_screen_prepare(void)
+{
+	return board_splash_screen_prepare();
+}
+#else
+static inline int splash_screen_prepare(void)
+{
+	return 0;
+}
+#endif
+
 static void *lcd_logo(void)
 {
 #ifdef CONFIG_SPLASH_SCREEN
@@ -1045,6 +1057,9 @@ static void *lcd_logo(void)
 		int x = 0, y = 0;
 		do_splash = 0;
 
+		if (splash_screen_prepare())
+			return (void *)lcd_base;
+
 		addr = simple_strtoul (s, NULL, 16);
 #ifdef CONFIG_SPLASH_SCREEN_ALIGN
 		s = getenv("splashpos");
diff --git a/include/lcd.h b/include/lcd.h
index c24164a..4ac4ddd 100644
--- a/include/lcd.h
+++ b/include/lcd.h
@@ -47,6 +47,7 @@ extern struct vidinfo panel_info;
 
 extern void lcd_ctrl_init (void *lcdbase);
 extern void lcd_enable (void);
+extern int board_splash_screen_prepare(void);
 
 /* setcolreg used in 8bpp/16bpp; initcolregs used in monochrome */
 extern void lcd_setcolreg (ushort regno,
-- 
1.7.10.4