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Major speedup of the iPod Video LCD driver. The internal update procedure of the BCM chip is now completely shadowed, handled by a tick task as necessary. Also fixes the occasional UI freezes due to stalled BCM updates by re-kicking it after a timeout.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15397 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-11-02 00:07:45 +00:00
parent a4d48d0c0d
commit ef8a7eaf2a
2 changed files with 236 additions and 155 deletions
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71
firmware/target/arm/ipod/video/lcd-as-video.S
View file

@ -22,16 +22,11 @@
.align 2
.global lcd_write_data
.type lcd_write_data, %function
/* r0 = addr */
lcd_write_data: /* r1 = pixel count */
/* r0 = addr, must be aligned */
lcd_write_data: /* r1 = pixel count, must be even */
stmfd sp!, {r4-r6}
mov r2, #0x30000000 /* LCD data port */
tst r0, #2 /* first pixel unaligned? */
ldrneh r3, [r0], #2
strneh r3, [r2]
subne r1, r1, #1
subs r1, r1, #16
.loop16:
ldmgeia r0!, {r3-r6}
@ -51,17 +46,16 @@ lcd_write_data: /* r1 = pixel count */
tst r1, #2
ldrne r3, [r0], #4
strne r3, [r2]
tst r1, #1
ldrneh r3, [r0]
strneh r3, [r2]
ldmfd sp!, {r4-r6}
bx lr
/****************************************************************************
* void lcd_write_yuv_420_lines(unsigned char const * const src[3],
* int width,
* int stride);
* void lcd_write_yuv_420_upper(unsigned char const * const src[3],
* unsigned char *croma_buf, int width);
*
* void lcd_write_yuv_420_lower(unsigned char *y_src,
* unsigned char *croma_buf, int width);
*
* |R| |1.000000 -0.000001 1.402000| |Y'|
* |G| = |1.000000 -0.334136 -0.714136| |Pb|
@ -72,25 +66,18 @@ lcd_write_data: /* r1 = pixel count */
* |B| |74 128 0| |Cr - 128| >> 9
*/
.align 2
.global lcd_write_yuv420_lines
.type lcd_write_yuv420_lines, %function
lcd_write_yuv420_lines:
.global lcd_write_yuv420_upper
.type lcd_write_yuv420_upper, %function
lcd_write_yuv420_upper:
/* r0 = yuv_src */
/* r1 = width */
/* r2 = stride */
/* r1 = chroma buffer */
/* r2 = width */
stmfd sp!, { r4-r12 } /* save non-scratch */
ldmia r0, { r10, r11, r12 } /* r10 = yuv_src[0] = Y'_p */
/* r11 = yuv_src[1] = Cb_p */
/* r12 = yuv_src[2] = Cr_p */
add r2, r10, r2 /* r2 = &ysrc[stride] */
add r3, r1, r1, asl #1 /* number of bytes for chroma buffer */
add r3, r3, #15 /* plus room for 3 additional words, */
bic r3, r3, #3 /* rounded up to multiples of 4 byte */
sub sp, sp, r3 /* and allocate on stack */
stmia sp, {r1, r2, r3} /* width, &ysrc[stride], stack_alloc */
mov r7, r1 /* r7 = loop count */
add r8, sp, #12 /* chroma buffer */
mov r7, r2 /* r7 = loop count */
mov r8, r1 /* chroma buffer */
mov r9, #0x30000000 /* LCD data port */
/* 1st loop start */
@ -181,13 +168,27 @@ lcd_write_yuv420_lines:
subs r7, r7, #2 /* check for loop end */
bgt 10b /* back to beginning */
/* 1st loop end */
add r8, sp, #12 /* chroma buffer */
ldmia sp, { r7, r10 } /* r7 = loop count */
/* r10 = &ysrc[stride] */
ldmfd sp!, { r4-r12 } /* restore registers */
bx lr
.ltorg
.size lcd_write_yuv420_upper, .-lcd_write_yuv420_upper
.align 2
.global lcd_write_yuv420_lower
.type lcd_write_yuv420_lower, %function
lcd_write_yuv420_lower:
/* r0 = y_src */
/* r1 = croma buf */
/* r2 = width */
stmfd sp!, { r4-r10 } /* save non-scratch */
mov r10, r0 /* r10 = y_src */
mov r7, r2 /* r7 = loop count */
mov r8, r1 /* chroma buffer */
mov r9, #0x30000000 /* LCD data port */
/* 2nd loop start */
20: /* loop start */
/* restore r1, r3 and r0 from chroma buffer */
@ -257,10 +258,8 @@ lcd_write_yuv420_lines:
bgt 20b /* back to beginning */
/* 2nd loop end */
ldr r3, [sp, #8]
add sp, sp, r3 /* deallocate buffer */
ldmfd sp!, { r4-r12 } /* restore registers */
ldmfd sp!, { r4-r10 } /* restore registers */
bx lr
.ltorg
.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
.size lcd_write_yuv420_lower, .-lcd_write_yuv420_lower

296
firmware/target/arm/ipod/video/lcd-video.c
View file

@ -48,6 +48,132 @@
#define BCM_ALT_RD_ADDR32 (*(volatile unsigned long *)(0x30060000))
#define BCM_ALT_CONTROL (*(volatile unsigned short*)(0x30070000))
#define BCM_FB_BASE 0xE0020 /* Address of internal BCM framebuffer */
/* Time until the BCM is considered stalled and will be re-kicked.
* Must be guaranteed to be >~ 20ms. */
#define BCM_UPDATE_TIMEOUT (HZ/20)
enum lcd_status {
LCD_IDLE,
LCD_INITIAL,
LCD_NEED_UPDATE,
LCD_UPDATING
};
struct {
long update_timeout;
enum lcd_status state;
bool blocked;
struct corelock cl; /* inter-core sync */
} lcd_state IBSS_ATTR;
static inline void bcm_write_addr(unsigned address)
{
BCM_WR_ADDR32 = address; /* write destination address */
while (!(BCM_CONTROL & 0x2)); /* wait for it to be write ready */
}
static inline void bcm_write32(unsigned address, unsigned value)
{
bcm_write_addr(address); /* set destination address */
BCM_DATA32 = value; /* write value */
}
static inline unsigned bcm_read32(unsigned address)
{
while (!(BCM_RD_ADDR & 1));
BCM_RD_ADDR32 = address; /* write source address */
while (!(BCM_CONTROL & 0x10)); /* wait for it to be read ready */
return BCM_DATA32; /* read value */
}
static void bcm_setup_rect(unsigned x, unsigned y,
unsigned width, unsigned height)
{
bcm_write_addr(0xE0004);
BCM_DATA32 = x;
BCM_DATA32 = y;
BCM_DATA32 = x + width - 1;
BCM_DATA32 = y + height - 1;
}
static void lcd_tick(void)
{
/* No set_irq_level - already in interrupt context */
corelock_lock(&lcd_state.cl);
if (!lcd_state.blocked && lcd_state.state >= LCD_NEED_UPDATE)
{
unsigned data = bcm_read32(0x1F8);
bool bcm_is_busy = (data == 0xFFFA0005 || data == 0xFFFF);
if (((lcd_state.state == LCD_NEED_UPDATE) && !bcm_is_busy)
/* Update requested and BCM is no longer busy. */
|| (TIME_AFTER(current_tick, lcd_state.update_timeout) && bcm_is_busy))
/* BCM still busy after timeout, i.e. stalled. */
{
bcm_write32(0x1F8, 0xFFFA0005); /* Kick off update */
BCM_CONTROL = 0x31;
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
lcd_state.state = LCD_UPDATING;
}
else if ((lcd_state.state == LCD_UPDATING) && !bcm_is_busy)
{
/* Update finished properly and no new update pending. */
lcd_state.state = LCD_IDLE;
}
}
corelock_unlock(&lcd_state.cl);
}
static inline void lcd_block_tick(void)
{
int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
corelock_lock(&lcd_state.cl);
lcd_state.blocked = true;
corelock_unlock(&lcd_state.cl);
set_irq_level(oldlevel);
}
static void lcd_unblock_and_update(void)
{
unsigned data;
bool bcm_is_busy;
int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
corelock_lock(&lcd_state.cl);
data = bcm_read32(0x1F8);
bcm_is_busy = (data == 0xFFFA0005 || data == 0xFFFF);
if (!bcm_is_busy || (lcd_state.state == LCD_INITIAL) ||
TIME_AFTER(current_tick, lcd_state.update_timeout))
{
bcm_write32(0x1F8, 0xFFFA0005); /* Kick off update */
BCM_CONTROL = 0x31;
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
lcd_state.state = LCD_UPDATING;
}
else
{
lcd_state.state = LCD_NEED_UPDATE; /* Post update request */
}
lcd_state.blocked = false;
corelock_unlock(&lcd_state.cl);
set_irq_level(oldlevel);
}
/*** hardware configuration ***/
void lcd_set_contrast(int val)
@ -72,7 +198,11 @@ void lcd_set_flip(bool yesno)
/* LCD init */
void lcd_init_device(void)
{
/* iPodLinux doesn't appear have any LCD init code for the Video */
lcd_state.blocked = false;
lcd_state.state = LCD_INITIAL;
corelock_init(&lcd_state.cl);
bcm_setup_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
tick_add_task(&lcd_tick);
}
/*** update functions ***/
@ -91,55 +221,11 @@ void lcd_blit(const fb_data* data, int x, int by, int width,
(void)stride;
}
static inline void lcd_bcm_write32(unsigned address, unsigned value)
{
/* write out destination address */
BCM_WR_ADDR32 = address;
/* wait for it to be write ready */
while (!(BCM_CONTROL & 0x2));
/* write out the value */
BCM_DATA32 = value;
}
static void lcd_bcm_setup_rect(unsigned cmd,
unsigned x,
unsigned y,
unsigned width,
unsigned height)
{
lcd_bcm_write32(0x1F8, 0xFFFA0005);
lcd_bcm_write32(0xE0000, cmd);
lcd_bcm_write32(0xE0004, x);
lcd_bcm_write32(0xE0008, y);
lcd_bcm_write32(0xE000C, x + width - 1);
lcd_bcm_write32(0xE0010, y + height - 1);
lcd_bcm_write32(0xE0014, (width * height) << 1);
lcd_bcm_write32(0xE0018, (width * height) << 1);
lcd_bcm_write32(0xE001C, 0);
}
static inline unsigned lcd_bcm_read32(unsigned address)
{
while (!(BCM_RD_ADDR & 1));
/* write out destination address */
BCM_RD_ADDR32 = address;
/* wait for it to be read ready */
while (!(BCM_CONTROL & 0x10));
/* read the value */
return BCM_DATA32;
}
static bool finishup_needed = false;
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height)
{
const fb_data *addr;
unsigned bcmaddr;
if (x + width >= LCD_WIDTH)
width = LCD_WIDTH - x;
@ -147,43 +233,36 @@ void lcd_update_rect(int x, int y, int width, int height)
height = LCD_HEIGHT - y;
if ((width <= 0) || (height <= 0))
return; /* Nothing left to do - 0 is harmful to lcd_write_data(). */
return; /* Nothing left to do. */
/* Ensure x and width are both even. The BCM doesn't like small unaligned
* writes and would just ignore them. */
width = (width + (x & 1) + 1) & ~1;
x &= ~1;
/* Prevent the tick from triggering BCM updates while we're writing. */
lcd_block_tick();
addr = &lcd_framebuffer[y][x];
bcmaddr = BCM_FB_BASE + (LCD_WIDTH*2) * y + (x << 1);
if (finishup_needed)
if (width == LCD_WIDTH)
{
/* Bottom-half of original lcd_bcm_finishup() function */
unsigned int data = lcd_bcm_read32(0x1F8);
while (data == 0xFFFA0005 || data == 0xFFFF)
bcm_write_addr(bcmaddr);
lcd_write_data(addr, width * height);
}
else
{
/* This loop can wait for up to 14ms - so we yield() */
yield();
data = lcd_bcm_read32(0x1F8);
}
}
lcd_bcm_read32(0x1FC);
lcd_bcm_setup_rect(0x34, x, y, width, height);
/* write out destination address */
BCM_WR_ADDR32 = 0xE0020;
while (!(BCM_CONTROL & 0x2)); /* wait for it to be write ready */
do
{
bcm_write_addr(bcmaddr);
bcmaddr += (LCD_WIDTH*2);
lcd_write_data(addr, width);
addr += LCD_WIDTH;
}
while (--height > 0);
/* Top-half of original lcd_bcm_finishup() function */
BCM_CONTROL = 0x31;
lcd_bcm_read32(0x1FC);
finishup_needed = true;
}
lcd_unblock_and_update();
}
/* Update the display.
@ -193,18 +272,21 @@ void lcd_update(void)
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
int width,
int stride);
/* Line write helper functions for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_upper(unsigned char const * const src[3],
unsigned char *chroma_buf, int width);
extern void lcd_write_yuv420_lower(unsigned const char *y_src,
unsigned char *chroma_buf, int width);
/* Performance function to blit a YUV bitmap directly to the LCD */
void lcd_yuv_blit(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
unsigned char const * yuv_src[3];
unsigned bcmaddr;
off_t z;
unsigned char const * yuv_src[3];
unsigned char chroma_buf[3*width]; /* dynamic */
/* Sorry, but width and height must be >= 2 or else */
width &= ~1;
@ -214,42 +296,42 @@ void lcd_yuv_blit(unsigned char * const src[3],
yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
if (finishup_needed)
{
/* Bottom-half of original lcd_bcm_finishup() function */
unsigned int data = lcd_bcm_read32(0x1F8);
while (data == 0xFFFA0005 || data == 0xFFFF)
{
/* This loop can wait for up to 14ms - so we yield() */
yield();
data = lcd_bcm_read32(0x1F8);
}
}
lcd_bcm_read32(0x1FC);
lcd_bcm_setup_rect(0x34, x, y, width, height);
/* write out destination address */
BCM_WR_ADDR32 = 0xE0020;
while (!(BCM_CONTROL & 0x2)); /* wait for it to be write ready */
/* Prevent the tick from triggering BCM updates while we're writing. */
lcd_block_tick();
bcmaddr = BCM_FB_BASE + (LCD_WIDTH*2) * y + (x << 1);
height >>= 1;
if (width == LCD_WIDTH)
{
bcm_write_addr(bcmaddr);
do
{
lcd_write_yuv420_lines(yuv_src, width, stride);
yuv_src[0] += stride << 1; /* Skip down two luma lines */
lcd_write_yuv420_upper(yuv_src, chroma_buf, width);
yuv_src[0] += stride;
lcd_write_yuv420_lower(yuv_src[0], chroma_buf, width);
yuv_src[0] += stride;
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
}
while (--height > 0);
/* Top-half of original lcd_bcm_finishup() function */
BCM_CONTROL = 0x31;
lcd_bcm_read32(0x1FC);
finishup_needed = true;
}
else
{
do
{
bcm_write_addr(bcmaddr);
bcmaddr += (LCD_WIDTH*2);
lcd_write_yuv420_upper(yuv_src, chroma_buf, width);
yuv_src[0] += stride;
bcm_write_addr(bcmaddr);
bcmaddr += (LCD_WIDTH*2);
lcd_write_yuv420_lower(yuv_src[0], chroma_buf, width);
yuv_src[0] += stride;
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
}
while (--height > 0);
}
lcd_unblock_and_update();
}