This provides an option for the LCD to flush the dcache after each update (puts, scroll or clear).
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Put the LCD cache flush logic into lcd_putc() instead of lcd_puts()
Changes in v3: - Put the LCD cache flush logic back into lcd_puts()
common/lcd.c | 46 +++++++++++++++++++++++++++++++++++++++------- include/lcd.h | 8 ++++++++ 2 files changed, 47 insertions(+), 7 deletions(-)
diff --git a/common/lcd.c b/common/lcd.c index 18525a7..f7514a4 100644 --- a/common/lcd.c +++ b/common/lcd.c @@ -97,6 +97,9 @@ static void lcd_setbgcolor (int color);
char lcd_is_enabled = 0;
+static char lcd_flush_dcache; /* 1 to flush dcache after each lcd update */ + + #ifdef NOT_USED_SO_FAR static void lcd_getcolreg (ushort regno, ushort *red, ushort *green, ushort *blue); @@ -105,6 +108,28 @@ static int lcd_getfgcolor (void);
/************************************************************************/
+/* Flush LCD activity to the caches */ +void lcd_sync(void) +{ + /* + * flush_dcache_range() is declared in common.h but it seems that some + * architectures do not actually implement it. Is there a way to find + * out whether it exists? For now, ARM is safe. + */ +#ifdef CONFIG_ARM + int line_length; + + if (lcd_flush_dcache) + flush_dcache_range((u32)lcd_base, + (u32)(lcd_base + lcd_get_size(&line_length))); +#endif +} + +void lcd_set_flush_dcache(int flush) +{ + lcd_flush_dcache = (flush != 0); +} + /*----------------------------------------------------------------------*/
static void console_scrollup (void) @@ -114,6 +139,7 @@ static void console_scrollup (void)
/* Clear the last one */ memset (CONSOLE_ROW_LAST, COLOR_MASK(lcd_color_bg), CONSOLE_ROW_SIZE); + lcd_sync(); }
/*----------------------------------------------------------------------*/ @@ -144,6 +170,8 @@ static inline void console_newline (void) /* Scroll everything up */ console_scrollup () ; --console_row; + } else { + lcd_sync(); } }
@@ -198,6 +226,7 @@ void lcd_puts (const char *s) while (*s) { lcd_putc (*s++); } + lcd_sync(); }
/*----------------------------------------------------------------------*/ @@ -365,13 +394,6 @@ int drv_lcd_init (void) }
/*----------------------------------------------------------------------*/ -static -int do_lcd_clear(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) -{ - lcd_clear(); - return 0; -} - void lcd_clear(void) { #if LCD_BPP == LCD_MONOCHROME @@ -413,6 +435,14 @@ void lcd_clear(void)
console_col = 0; console_row = 0; + lcd_sync(); +} + +static int do_lcd_clear(cmd_tbl_t *cmdtp, int flag, int argc, + char *const argv[]) +{ + lcd_clear(); + return 0; }
U_BOOT_CMD( @@ -607,6 +637,7 @@ void bitmap_plot (int x, int y) }
WATCHDOG_RESET(); + lcd_sync(); } #else static inline void bitmap_plot(int x, int y) {} @@ -820,6 +851,7 @@ int lcd_display_bitmap(ulong bmp_image, int x, int y) break; };
+ lcd_sync(); return (0); } #endif diff --git a/include/lcd.h b/include/lcd.h index 26f6d83..4363131 100644 --- a/include/lcd.h +++ b/include/lcd.h @@ -57,6 +57,14 @@ extern void lcd_initcolregs (void); extern struct bmp_image *gunzip_bmp(unsigned long addr, unsigned long *lenp); extern int bmp_display(ulong addr, int x, int y);
+/** + * Set whether we need to flush the dcache when changing the LCD image. This + * defaults to off. + * + * @param flush non-zero to flush cache after update, 0 to skip + */ +void lcd_set_flush_dcache(int flush); + #if defined CONFIG_MPC823 /* * LCD controller stucture for MPC823 CPU