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Speed up the Fuze's LCD by a factor of ~2.1 (lcd_update()) by using 32bit transfers when possible.

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Unaligned (to 4byte boundary) and odd (where the amount of data is not an integer multiple of 32bit) are still supported. Even those still have a speedup of >2.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22574 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2009-08-31 15:54:25 +00:00
parent cdafa3e498
commit 7dd548c697
2 changed files with 46 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

58
firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c
View file

@ -44,7 +44,7 @@ static bool display_on = false; /* is the display turned on? */
static bool display_flipped = false;
static int xoffset = 20; /* needed for flip */
/* we need to write a red pixel for correct button reads
* (see lcd_button_support()), but that must not happen while the lcd is updating
* (see lcd_button_support()),but that must not happen while the lcd is updating
* so block lcd_button_support the during updates */
static bool lcd_busy = false;
@ -54,29 +54,35 @@ static void as3525_dbop_init(void)
DBOP_TIMPOL_01 = 0xe167e167;
DBOP_TIMPOL_23 = 0xe167006e;
DBOP_CTRL = 0x41008;
/* short count: 16 | output data width: 16 | readstrobe line */
DBOP_CTRL = (1<<18|1<<12|1<<3);
GPIOB_AFSEL = 0xfc;
GPIOC_AFSEL = 0xff;
DBOP_TIMPOL_23 = 0x6000e;
DBOP_CTRL = 0x51008;
/* short count: 16|enable write|output data width: 16|read strobe line */
DBOP_CTRL = (1<<18|1<<16|1<<12|1<<3);
DBOP_TIMPOL_01 = 0x6e167;
DBOP_TIMPOL_23 = 0xa167e06f;
/* TODO: The OF calls some other functions here, but maybe not important */
}
#define lcd_write_single_data16(value) do {\
DBOP_CTRL &= ~(1<<14|1<<13); \
DBOP_DOUT16 = (fb_data)(value); \
} while(0)
static void lcd_write_cmd(int cmd)
{
int x;
/* Write register */
DBOP_CTRL &= ~(1<<14);
DBOP_TIMPOL_23 = 0xa167006e;
DBOP_DOUT = cmd;
lcd_write_single_data16(cmd);
/* Wait for fifo to empty */
while ((DBOP_STAT & (1<<10)) == 0);
@ -93,13 +99,33 @@ static void lcd_write_cmd(int cmd)
void lcd_write_data(const fb_data* p_bytes, int count)
{
while (count--)
const long *data;
if ((int)p_bytes & 0x3)
{ /* need to do a single 16bit write beforehand if the address is
* not word aligned*/
lcd_write_single_data16(*p_bytes);
count--;p_bytes++;
}
/* from here, 32bit transfers are save */
/* set it to transfer 4*(outputwidth) units at a time,
* if bit 12 is set it only does 2 halfwords though */
DBOP_CTRL |= (1<<13|1<<14);
data = (long*)p_bytes;
while (count > 1)
{
DBOP_DOUT = *p_bytes++;
DBOP_DOUT32 = *data++;
count -= 2;
/* Wait for fifo to empty */
/* TODO: We should normally fill the fifo until it's full
* instead of waiting after each word,
* but that causes blue lines on the display */
while ((DBOP_STAT & (1<<10)) == 0);
}
/* due to the 32bit alignment requirement, we possibly need to do a
* 16bit transfer at the end also */
if (count > 0)
lcd_write_single_data16(*(fb_data*)data);
}
static void lcd_write_reg(int reg, int value)
@ -107,7 +133,7 @@ static void lcd_write_reg(int reg, int value)
unsigned short data = value;
lcd_write_cmd(reg);
lcd_write_data(&data, 1);
lcd_write_single_data16(data);
}
/* turn the display upside down (call lcd_update() afterwards) */
@ -239,8 +265,8 @@ extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
extern void lcd_write_yuv420_lines_odither(unsigned char const * const src[3],
int width,
int stride,
int x_screen, /* To align dither pattern */
int y_screen);
int x_screen, /* To align dither */
int y_screen); /* pattern */
/* Performance function to blit a YUV bitmap directly to the LCD */
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
@ -319,7 +345,6 @@ void lcd_update(void)
{
if (!display_on)
return;
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
lcd_busy = true;
@ -338,11 +363,12 @@ void lcd_update(void)
void lcd_update_rect(int x, int y, int width, int height)
{
int xmax, ymax;
const unsigned short *ptr;
const fb_data *ptr;
if (!display_on)
return;
xmax = x + width;
if (xmax >= LCD_WIDTH)
xmax = LCD_WIDTH - 1; /* Clip right */
@ -370,7 +396,7 @@ void lcd_update_rect(int x, int y, int width, int height)
/* Start write to GRAM */
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
ptr = (unsigned short *)&lcd_framebuffer[y][x];
ptr = &lcd_framebuffer[y][x];
do
{
@ -394,7 +420,7 @@ bool lcd_button_support(void)
lcd_window_y(-1, 0);
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
lcd_write_data(&data, 1);
lcd_write_single_data16(data);
return true;
}