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FS#11708 - Major speedup of iPod nano 2G. Part 1: Loop unrolling and reduction of FIFO register polling. +50% for RGB, +34% for YUV.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28809 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2010-12-12 15:01:36 +00:00
parent 9da76f3031
commit d192bdf11e
1 changed files with 25 additions and 11 deletions
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36
firmware/target/arm/s5l8700/ipodnano2g/lcd-nano2g.c
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@ -417,10 +417,8 @@ void lcd_init_device(void)
static inline void lcd_write_pixel(fb_data pixel)
{
while (LCD_STATUS & 0x10);
LCD_WDATA = (pixel & 0xff00) >> 8;
while (LCD_STATUS & 0x10);
LCD_WDATA = pixel & 0xff;
LCD_WDATA = pixel >> 8;
LCD_WDATA = pixel; /* no need to &0xff here, only lower 8 bit used */
}
/* Update the display.
@ -435,9 +433,10 @@ void lcd_update(void)
void lcd_update_rect(int, int, int, int) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
{
int xx,yy;
int y0, x0, y1, x1;
fb_data* p;
width = (width + 1) & ~1; /* ensure width is even */
x0 = x; /* start horiz */
y0 = y; /* start vert */
@ -467,15 +466,29 @@ void lcd_update_rect(int x, int y, int width, int height)
s5l_lcd_write_cmd(R_MEMORY_WRITE);
}
/* Copy display bitmap to hardware */
p = &lcd_framebuffer[y0][x0];
yy = height;
for (yy = y0; yy <= y1; yy++) {
for (xx = x0; xx <= x1; xx++) {
if (LCD_WIDTH == width)
{
x1 = height*LCD_WIDTH/4;
do {
while (LCD_STATUS & 0x08); /* wait while FIFO is half full */
lcd_write_pixel(*(p++));
}
p += LCD_WIDTH - width;
lcd_write_pixel(*(p++));
lcd_write_pixel(*(p++));
lcd_write_pixel(*(p++));
} while (--x1 > 0);
} else {
y1 = height;
do {
x1 = width/2; /* width is forced to even to allow speed up */
do {
while (LCD_STATUS & 0x08); /* wait while FIFO is half full */
lcd_write_pixel(*(p++));
lcd_write_pixel(*(p++));
} while (--x1 > 0 );
p += LCD_WIDTH - width;
} while (--y1 > 0 );
}
}
@ -616,6 +629,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
}
/* output 2 pixels */
while (LCD_STATUS & 0x08); /* wait while FIFO is half full */
lcd_write_pixel((red1 << 11) | (green1 << 5) | blue1);
lcd_write_pixel((red2 << 11) | (green2 << 5) | blue2);
}