1.简化LCD时钟计算方法：

修改drivers/video/s3c2440fb.c文件365行左右的函数static void s3c2410fb_activate_var(struct fb_info *info)如下：

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static void s3c2410fb_activate_var(struct fb_info *info)
{
  struct s3c2410fb_info *fbi = info->par;
  void __iomem *regs = fbi->io;
  int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
  struct fb_var_screeninfo *var = &info->var;
  //修改以下两行
  struct s3c2410fb_mach_info *mach_info=fbi->dev->platform_data;
  struct s3c2410fb_display *default_display=mach_info->displays+mach_info->default_display;
  int clkdiv;
  clkdiv = DIV_ROUND_UP(s3c2410fb_calc_pixclk(fbi, var->pixclock), 2);
  dprintk("%s: var->xres  = %d\n", __func__, var->xres);
  dprintk("%s: var->yres  = %d\n", __func__, var->yres);
  dprintk("%s: var->bpp   = %d\n", __func__, var->bits_per_pixel);
  if (type == S3C2410_LCDCON1_TFT) {
    s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
    --clkdiv;
    if (clkdiv < 0)
      clkdiv = 0;
  } else {
    s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
    if (clkdiv < 2)
      clkdiv = 2;
  }
  //此处修改如下
  //fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
  fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(default_display->setclkval);
  dprintk("new register set:\n");
  dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
  dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
  dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
  dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
  dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
  writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID,
  regs + S3C2410_LCDCON1);
  writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
  writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
  writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
  writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
  s3c2410fb_set_lcdaddr(info);
  fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
  writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
}

修改arch/arm/mach-s3c2410/include/mach/fb.h文件的40行左右的结构体s3c2410fb_display如下：

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struct s3c2410fb_display {
  unsigned type;
  unsigned short width;
  unsigned short height;
  unsigned short xres;
  unsigned short yres;
  unsigned short bpp;
  unsigned pixclock;
  //修改下面一行
  unsigned setclkval;
  unsigned short left_margin;
  unsigned short right_margin;
  unsigned short hsync_len;
  unsigned short upper_margin;
  unsigned short lower_margin;
  unsigned short vsync_len;
  unsigned long lcdcon5;
};

2.添加多种LCD支持：

修改arch/arm/mach-s3c2440/mach-smdk2440.c文件107行左右的结构体s3c2410fb_display smdk2440_lcd_cfg __initdata如下：

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static struct s3c2410fb_display smdk2440_lcd_cfg __initdata = {
  .lcdcon5 = S3C2410_LCDCON5_FRM565 |
   S3C2410_LCDCON5_INVVLINE |
   S3C2410_LCDCON5_INVVFRAME |
   S3C2410_LCDCON5_PWREN |
   S3C2410_LCDCON5_HWSWP,
  .type = S3C2410_LCDCON1_TFT,
  //修改以下
  #if defined(CONFIG_FB_S3C24X0_T240320)
  .width = 240,
  .height = 320,
  .pixclock = 100000,
  .setclkval = 0x4,
  .xres = 240,
  .yres = 320,
  .bpp = 16,
  .left_margin = 3,
  .right_margin = 6,
  .hsync_len = 1,
  .upper_margin = 2,
  .lower_margin = 1,
  .vsync_len = 1,
  #elif defined(CONFIG_FB_S3C24X0_S320240)
  .width = 320,
  .height = 240,
  .pixclock = 80000,
  .setclkval = 0x3,
  .xres = 320,
  .yres = 240,
  .bpp = 16,
  .left_margin = 15,
  .right_margin = 5,
  .hsync_len = 8,
  .upper_margin = 5,
  .lower_margin = 3,
  .vsync_len = 15,
  #elif defined(CONFIG_FB_S3C24X0_W320240)
  .width = 320,
  .height = 240,
  .pixclock = 80000,
  .setclkval = 0x3,
  .xres = 320,
  .yres = 240,
  .bpp = 16,
  .left_margin = 28,
  .right_margin = 24,
  .hsync_len = 42,
  .upper_margin = 6,
  .lower_margin = 2,
  .vsync_len = 12,
  #elif defined(CONFIG_FB_S3C24X0_LCD480272)
  .width = 480,
  .height = 272,
  .pixclock = 40000,
  .setclkval = 0x4,
  .xres = 480,
  .yres = 272,
  .bpp = 16,
  .left_margin = 19,
  .right_margin = 10,
  .hsync_len = 30,
  .upper_margin = 4,
  .lower_margin = 2,
  .vsync_len = 8,
  #elif defined(CONFIG_FB_S3C24X0_TFT640480)
  .width = 640,
  .height = 480,
  .pixclock = 40000,
  .setclkval = 0x1,
  .xres = 640,
  .yres = 480,
  .bpp = 16,
  .left_margin = 40,
  .right_margin = 67,
  .hsync_len = 31,
  .upper_margin = 5,
  .lower_margin = 25,
  .vsync_len = 1,
  #elif defined(CONFIG_FB_S3C24X0_TFT800480)
  .width = 800,
  .height = 480,
  .pixclock = 40000,
  .setclkval = 0x1,
  .xres = 800,
  .yres = 480,
  .bpp = 16,
  .left_margin = 15,
  .right_margin = 47,
  .hsync_len = 95,
  .upper_margin = 9,
  .lower_margin = 5,
  .vsync_len = 1,
  #elif defined(CONFIG_FB_S3C24X0_TFT800600)
  .width = 800,
  .height = 600,
  .pixclock = 40000,
  .setclkval = 0x1,
  .xres = 800,
  .yres = 600,
  .bpp = 16,
  .left_margin = 15,
  .right_margin = 47,
  .hsync_len = 95,
  .upper_margin = 9,
  .lower_margin = 5,
  .vsync_len = 1,
  #endif
};

修改同一文件235行左右的结构体s3c2410fb_mach_info smdk2440_fb_info __initdata如下：

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static struct s3c2410fb_mach_info smdk2440_fb_info __initdata = {
  .displays = &smdk2440_lcd_cfg,
  .num_displays = 1,
  .default_display = 0,
  #if 0
  .gpccon = 0xaa940659,
  .gpccon_mask = 0xffffffff,
  .gpcup = 0x0000ffff,
  .gpcup_mask = 0xffffffff,
  .gpdcon = 0xaa84aaa0,
  .gpdcon_mask = 0xffffffff,
  .gpdup = 0x0000faff,
  .gpdup_mask = 0xffffffff,
  #endif
  //注释掉下面一行
  // .lpcsel = ((0xCE6) & ~7) | 1<<4,
};

修改drivers/video/Kconfig文件1907到1986行左右如下：

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# 修改下面两行
config FB_S3C24X0
tristate "S3C24X0 LCD framebuffer support"
depends on FB && ARCH_S3C2410
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
---help---
 Frame buffer driver for the built-in LCD controller in the Samsung
 S3C2410 processor.
 This driver is also available as a module ( = code which can be
 inserted and removed from the running kernel whenever you want). The
 module will be called s3c2410fb. If you want to compile it as a module,
 say M here and read <file:Documentation/kbuild/modules.txt>.
 If unsure, say N.
# 修改以下
choice
prompt "LCD select"
depends on FB_S3C24X0
help
  S3C24x0 LCD size select
config FB_S3C24X0_S320240
boolean "3.5 inch 320x240 Samsung LCD"
depends on FB_S3C24X0
help
  3.5 inch 320x240 Samsung LCD
config FB_S3C24X0_W320240
boolean "3.5 inch 320x240 WanXin or QiMei LCD"
depends on FB_S3C24X0
help
  3.5 inch 320x240 WanXin or QiMei LCD
config FB_S3C24X0_T240320
boolean "3.5 inch 240X320 Toshiba LCD"
depends on FB_S3C24X0
help
  3.5 inch 240x320 Toshiba LCD
config FB_S3C24X0_TFT480272
boolean "4.3 inch 480X272 TFT LCD"
depends on FB_S3C24X0
help
  4.3 inch 480X272 TFT LCD
config FB_S3C24X0_TFT640480
boolean "VGA 640x480"
depends on FB_S3C24X0
help
  VGA 640x480
config FB_S3C24X0_TFT800480
boolean "7 inch 800x480 LCD"
depends on FB_S3C24X0
help
  7 inch 800x480 LCD
config FB_S3C24X0_TFT800600
boolean "10.4 inch 800x600 TFT LCD"
depends on FB_S3C24X0
help
  10.4 inch 800x480 TFT LCD
config FB_S3C24X0_TFT1024768
boolean "VGA 1024x768"
depends on FB_S3C24X0
help
  VGA 1024x768 TFT LCD
endchoice
# 修改以上
config FB_S3C2410_DEBUG
bool "S3C2410 lcd debug messages"
# 修改下面一行
depends on FB_S3C24X0
help
 Turn on debugging messages. Note that you can set/unset at run time
 through sysfs
}

修改drivers/video/Makefile文件116行左右如下：

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obj-$(CONFIG_FB_MAXINE)  += maxinefb.o
obj-$(CONFIG_FB_METRONOME)        += metronomefb.o
obj-$(CONFIG_FB_BROADSHEET)       += broadsheetfb.o
obj-$(CONFIG_FB_S1D13XXX)  += s1d13xxxfb.o
obj-$(CONFIG_FB_SH7760)  += sh7760fb.o
obj-$(CONFIG_FB_IMX)              += imxfb.o
obj-$(CONFIG_FB_S3C)  += s3c-fb.o
# 修改下面一行
obj-$(CONFIG_FB_S3C24X0)  += s3c2410fb.o
obj-$(CONFIG_FB_FSL_DIU)  += fsl-diu-fb.o
obj-$(CONFIG_FB_COBALT)           += cobalt_lcdfb.o
obj-$(CONFIG_FB_PNX4008_DUM)  += pnx4008/
obj-$(CONFIG_FB_PNX4008_DUM_RGB)  += pnx4008/
obj-$(CONFIG_FB_IBM_GXT4500)  += gxt4500.o
obj-$(CONFIG_FB_PS3)  += ps3fb.o
obj-$(CONFIG_FB_SM501)            += sm501fb.o
obj-$(CONFIG_FB_XILINX)           += xilinxfb.o