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FS#11807 - Major speedup of iPod nano 2G. Part 2: Use 16 bit data width and simplify write commands. Gives another +27% for YUV.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28811 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2010-12-12 15:10:45 +00:00
parent 26f2bfde03
commit 335df1d040
1 changed files with 8 additions and 15 deletions
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23
firmware/target/arm/s5l8700/ipodnano2g/lcd-nano2g.c
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@ -219,14 +219,10 @@ unsigned short lcd_init_sequence_1[] = {
static inline void s5l_lcd_write_cmd_data(int cmd, int data) static inline void s5l_lcd_write_cmd_data(int cmd, int data)
{ {
while (LCD_STATUS & 0x10); while (LCD_STATUS & 0x10);
LCD_WCMD = cmd >> 8; LCD_WCMD = cmd;
while (LCD_STATUS & 0x10);
LCD_WCMD = cmd & 0xff;
while (LCD_STATUS & 0x10); while (LCD_STATUS & 0x10);
LCD_WDATA = data >> 8; LCD_WDATA = data;
while (LCD_STATUS & 0x10);
LCD_WDATA = data & 0xff;
} }
static inline void s5l_lcd_write_cmd(unsigned short cmd) static inline void s5l_lcd_write_cmd(unsigned short cmd)
@ -238,23 +234,19 @@ static inline void s5l_lcd_write_cmd(unsigned short cmd)
static inline void s5l_lcd_write_wcmd(unsigned short cmd) static inline void s5l_lcd_write_wcmd(unsigned short cmd)
{ {
while (LCD_STATUS & 0x10); while (LCD_STATUS & 0x10);
LCD_WCMD = cmd >> 8; LCD_WCMD = cmd;
while (LCD_STATUS & 0x10);
LCD_WCMD = cmd & 0xff;
} }
static inline void s5l_lcd_write_data(unsigned short data) static inline void s5l_lcd_write_data(unsigned short data)
{ {
while (LCD_STATUS & 0x10); while (LCD_STATUS & 0x10);
LCD_WDATA = data & 0xff; LCD_WDATA = data;
} }
static inline void s5l_lcd_write_wdata(unsigned short data) static inline void s5l_lcd_write_wdata(unsigned short data)
{ {
while (LCD_STATUS & 0x10); while (LCD_STATUS & 0x10);
LCD_WDATA = data >> 8; LCD_WDATA = data;
while (LCD_STATUS & 0x10);
LCD_WDATA = data & 0xff;
} }
/*** hardware configuration ***/ /*** hardware configuration ***/
@ -409,6 +401,8 @@ void lcd_init_device(void)
lcd_type = 0; /* Similar to ILI9320 - aka "type 2" */ lcd_type = 0; /* Similar to ILI9320 - aka "type 2" */
else else
lcd_type = 1; /* Similar to LDS176 - aka "type 7" */ lcd_type = 1; /* Similar to LDS176 - aka "type 7" */
LCD_CON |= 0x100; /* use 16 bit bus width, little endian */
lcd_ispowered = true; lcd_ispowered = true;
} }
@ -417,8 +411,7 @@ void lcd_init_device(void)
static inline void lcd_write_pixel(fb_data pixel) static inline void lcd_write_pixel(fb_data pixel)
{ {
LCD_WDATA = pixel >> 8; LCD_WDATA = pixel;
LCD_WDATA = pixel; /* no need to &0xff here, only lower 8 bit used */
} }
/* Update the display. /* Update the display.