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Improved LCD driver for Sansa. Uses double-buffering to cure the flickering. Stops DMA during device initialization, which should stop the occasional hangs - based on FS#6859 by Antonius Hellmann

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12848 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Daniel Ankers 2007-03-20 10:52:02 +00:00
parent 0c1a304620
commit 15dfcd13ef
1 changed files with 43 additions and 13 deletions
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52
firmware/target/arm/sandisk/sansa-e200/lcd-e200.c
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@ -23,6 +23,7 @@
#include "config.h"
#include "lcd.h"
#include "system.h"
#include <string.h>
#define LCD_DATA_IN_GPIO GPIOB_INPUT_VAL
#define LCD_DATA_IN_PIN 6
@ -48,6 +49,11 @@
#define LCD_REG_9 (*(volatile unsigned long *)(0xc2000024))
#define LCD_FB_BASE_REG (*(volatile unsigned long *)(0xc2000028))
/* We don't know how to receive a DMA finished signal from the LCD controller
* To avoid problems with flickering, we double-buffer the framebuffer and turn
* off DMA while updates are taking place */
fb_data lcd_driver_framebuffer[LCD_FBHEIGHT][LCD_FBWIDTH];
static inline void lcd_init_gpio(void)
{
GPIOB_ENABLE |= (1<<7);
@ -133,6 +139,10 @@ inline void lcd_init_device(void)
{
/* All this is magic worked out by MrH */
/* Stop any DMA which is in progress */
LCD_REG_6 &= ~1;
udelay(100000);
/* Init GPIO ports */
lcd_init_gpio();
/* Controller init */
@ -179,7 +189,7 @@ inline void lcd_init_device(void)
LCD_REG_6 |= (1 << 4);
LCD_REG_5 &= ~(1 << 7);
LCD_FB_BASE_REG = phys_fb_address((unsigned long)lcd_framebuffer);
LCD_FB_BASE_REG = phys_fb_address((unsigned long)lcd_driver_framebuffer);
udelay(100000);
@ -247,20 +257,40 @@ inline void lcd_init_device(void)
lcd_send_msg(0x70, 34);
}
inline void lcd_update(void)
{
cache_flush();
if(!(LCD_REG_6 & 1))
LCD_REG_6 |= 1;
}
inline void lcd_update_rect(int x, int y, int width, int height)
{
(void)x;
(void) y;
(void)width;
(void) height;
lcd_update();
/* Turn off DMA and wait for the transfer to complete */
/* TODO: Work out the proper delay */
LCD_REG_6 &= ~1;
udelay(1000);
/* Copy the Rockbox framebuffer to the second framebuffer */
/* TODO: Move the second framebuffer into uncached SDRAM */
memcpy(((char*)&lcd_driver_framebuffer)+(y * sizeof(fb_data) * LCD_WIDTH),
((char *)&lcd_framebuffer)+(y * sizeof(fb_data) * LCD_WIDTH),
((height * sizeof(fb_data) * LCD_WIDTH)));
cache_flush();
/* Restart DMA */
LCD_REG_6 |= 1;
}
inline void lcd_update(void)
{
/* TODO: It may be faster to swap the addresses of lcd_driver_framebuffer
* and lcd_framebuffer */
/* Turn off DMA and wait for the transfer to complete */
LCD_REG_6 &= ~1;
udelay(1000);
/* Copy the Rockbox framebuffer to the second framebuffer */
memcpy(lcd_driver_framebuffer, lcd_framebuffer, sizeof(fb_data) * LCD_WIDTH * LCD_HEIGHT);
cache_flush();
/* Restart DMA */
LCD_REG_6 |= 1;
}