From af00c3ca87650e2d354c8f9b22546b6901eec6f1 Mon Sep 17 00:00:00 2001
From: kugel <kugel@a1c6a512-1295-4272-9138-f99709370657>
Date: Tue, 8 Sep 2009 13:57:13 +0000
Subject: [PATCH] Samsung YH925: Reset the LCD orientation to what the OF
 expects before branching to it in dualbooting

Author: Mark Arigo

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22659 a1c6a512-1295-4272-9138-f99709370657
---
 bootloader/main-pp.c                          | 13 ++++++++++++-
 firmware/target/arm/samsung/yh925/lcd-yh925.c | 12 ++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/bootloader/main-pp.c b/bootloader/main-pp.c
index c213a6512..ef0e199e3 100644
--- a/bootloader/main-pp.c
+++ b/bootloader/main-pp.c
@@ -47,6 +47,11 @@
 #include "usb.h"
 #include "usb_drv.h"
 #endif
+#if defined(SAMSUNG_YH925)
+/* this function (in lcd-yh925.c) resets the screen orientation for the OF
+ * for use with dualbooting */
+void lcd_reset(void);
+#endif
 
 /* Show the Rockbox logo - in show_logo.c */
 extern int show_logo(void);
@@ -575,7 +580,7 @@ void* main(void)
            The rest of the loading is done in crt0.S.
            1) First try reading from the hidden partition (on Sansa only).
            2) Next try a decrypted mi4 file in /System/OF.mi4
-           3) Finally, try a raw firmware binary in /System/OF.mi4. It should be
+           3) Finally, try a raw firmware binary in /System/OF.bin. It should be
               a mi4 firmware decrypted and header stripped using mi4code.
         */
         printf("Loading original firmware...");
@@ -615,6 +620,9 @@ void* main(void)
             printf("Can't load /System/OF.mi4");
             printf(strerror(rc));
         } else {
+#if defined(SAMSUNG_YH925)
+            lcd_reset();
+#endif
             return (void*)loadbuffer;
         }
 
@@ -624,6 +632,9 @@ void* main(void)
             printf("Can't load /System/OF.bin");
             printf(strerror(rc));
         } else {
+#if defined(SAMSUNG_YH925)
+            lcd_reset();
+#endif
             return (void*)loadbuffer;
         }
         
diff --git a/firmware/target/arm/samsung/yh925/lcd-yh925.c b/firmware/target/arm/samsung/yh925/lcd-yh925.c
index edeef49d4..7509deff3 100644
--- a/firmware/target/arm/samsung/yh925/lcd-yh925.c
+++ b/firmware/target/arm/samsung/yh925/lcd-yh925.c
@@ -190,6 +190,18 @@ void lcd_set_flip(bool flip)
     lcd_write_reg(R_ENTRY_MODE, 0x1028);
 }
 
+/* Reset the LCD prior to booting the OF */
+#ifdef BOOTLOADER
+void lcd_reset(void)
+{
+    lcd_write_reg(R_DRV_OUTPUT_CONTROL, 0x0315);
+    lcd_write_reg(R_ENTRY_MODE, 0x1028);
+    lcd_write_reg(R_HORIZ_RAM_ADDR_POS, 0x7f00);
+    lcd_write_reg(R_VERT_RAM_ADDR_POS, 0xaf10);
+    lcd_write_reg(R_RAM_ADDR_SET, 0x0000);
+}
+#endif
+
 /* LCD init */
 void lcd_init_device(void)
 {
-- 
2.11.4.GIT