LCD驱动---LVDS详解（一）
fb_videomode每个参数的意思：
1struct fb_videomode {
2 const char *name; //name
3 u32 refresh; //Frequency
4 u32 xres;
5 u32 yres;
6 u32 pixclock; //时钟频率
7 u32 left_margin; //HBPD( Horizontal sync Back porch (pixels))
8 u32 right_margin; //HFPD(Horizontal sync Front porch (pixels))
9 u32 upper_margin; //VBPD(Vertical sync Back porch (pixels))
10 u32 lower_margin; //VFPD( vertical sync Front porch (pixels))
11 u32 hsync_len; //HSPW(Horizontal sync pulse width (pixels))
12 u32 vsync_len; //VSPW(Vertical Sync pulse width (pixels))
13 u32 sync;
14 u32 vmode;
15 u32 flag;
16 };
这个参数在屏幕的规格书里都有或者可以参考下面的设置：
---------------------------------------------------
720x480p:
Generic timing details for 720x480:
HFP=76 HSW=40 HBP=100 HF=34KHz VFP=29 VSW=1VBP=53 VF=60Hz
----------------------------------------------------
Widescreen 16:9
848x480p
Generic timing details for 848x480:
HFP=88 HSW=48 HBP=120 HF=34KHz VFP=28 VSW=1VBP=54 VF=60Hz
----------------------------------------------------
Widescreen 16:9
856x480p
Generic timing details for 856x480:
HFP=87 HSW=48 HBP=121 HF=34KHz VFP=28 VSW=1VBP=54 VF=60Hz
----------------------------------------------------
Screen 4:3
1080x480p
Generic timing details for 1080x480:
HFP=108 HSW=48 HBP=164 HF=34KHz VFP=29VSW=1 VBP=53 VF=60Hz
----------------------------------------------------
Screen 4:3
1440x480p
Generic timing details for 1440x480:
HFP=144 HSW=80 HBP=208 HF=34KHz VFP=29VSW=1 VBP=53 VF=60Hz
-----------------------------------------------------
Screen 4:3
1800x480p
Generic timing details for 1800x480:
HFP=154 HSW=96 HBP=246 HF=34KHz VFP=32VSW=1 VBP=50 VF=60Hz
-----------------------------------------------------
Screen 4:3
1800x540p
Generic timing details for 1800x540:
HFP=148 HSW=96 HBP=244 HF=34KHz VFP=7 VSW=1VBP=15 VF=60Hz
-----------------------------------------------------
Screen 4:3
1920x540p
Generic timing details for 1920x540:
HFP=161 HSW=104 HBP=255 HF=34KHz VFP=7VSW=1 VBP=15 VF=60Hz
-----------------------------------------------------
Screen 4:3
960x540p
Generic timing details for 960x540:
HFP=98 HSW=48 HBP=142 HF=34KHz VFP=7 VSW=1VBP=15 VF=60Hz
--------------------------------------------------------------------------------------
Powerstrip dongle 540P/1080i customtimings:
------------------------------------------------------------------------
Screen 4:3
640x480p HDTV
Generic timing details for 640x480:
HFP=143 HSW=48 HBP=169 HF=34KHz VFP=28VSW=1 VBP=54 VF=60Hz
-------------------------------------------------------------------
Screen 4:3
720x480p HDTV
Generic timing details for 720x480:
HFP=72 HSW=48 HBP=88 HF=34KHz VFP=29 VSW=1VBP=53 VF=60Hz
-------------------------------------------------------------------
Screen 4:3
856x480p HDTV
Generic timing details for 856x480:
HFP=88 HSW=48 HBP=120 HF=34KHz VFP=28 VSW=1VBP=54 VF=60Hz
--------------------------------------------------------------------
Screen 4:3
1776x1000i HDTV
Generic timing details for 1776x1000:
HFP=136 HSW=48 HBP=240 kHz=34 VFP=42 VSW=5VBP=78 Hz=30
interlace
--------------------------------------------------------------------
Screen 16:9
1920x1080i HDTV
Generic timing details for 1920x1080:
HFP=169 HSW=64 HBP=295 HF=34KHz VFP=20VSW=5 VBP=20 VF=30Hz
interlace
------------------------------------------------------------------------------------
Screen 4:3
800x600i
Generic timing details for 800x600:
HFP=279 HSW=56 HBP=329 HF=34KHz VFP=250VSW=1 VBP=274 VF =30Hz
interlace
-------------------------------------------------------
Screen 4:3
1024x768i
Generic timing details for 1024x768:
HFP=164 HSW=56 HBP=220 HF=34KHz VFP=160VSW=1 VBP=196 VF=30Hz
interlace
--------------------------------------------------------
Screen 4:3
1152x864i
Generic timing details for 1152x864:
HFP=190 HSW=112 HBP=218 HF=34KHz VFP=112VSW=1 VBP=148 VF=30Hz
interlace
-----------------------------------------------------------
Screen 4:3
1280x720i
Generic timing details for 1280x720:
HFP=125 HSW=120 HBP=139 HF=34KHz VFP=180VSW=1 VBP=224 VF=30Hz
interlace
-----------------------------------------------------------
Screen 4:3
1280x768i
Generic timing details for 1280x768:
HFP=138 HSW=96 HBP=166 HF=34KHz VFP=156VSW=1 VBP=200 VF=30Hz
interlace
--------------------------------------------------------------
Screen 4:3
1280x960i
Generic timing details for 1280x960:
HFP=128 HSW=96 HBP=160 HF=34KHz VFP=44VSW=1 VBP=120 VF=30Hz
interlace
----------------------------------------------------------------
Screen 4:3
1280x1024i
Generic timing details for 1280x1024:
HFP=127 HSW=96 HBP=161 HF=34KHz VFP=43VSW=3 VBP=55 VF=30Hz
interlace
----------------------------------------------------------------
Screen 4:3
1440x960i
Generic timing details for 1440x960:
HFP=140 HSW=104 HBP=180 HF=34KHz VFP=60VSW=1 VBP=104 VF=30Hz
interlace
------------------------------------------------------------------
Screen 4:3
1600x900i
Generic timing details for 1600x900:
HFP=159 HSW=80 HBP=249 HF=34KHz VFP=89VSW=3 VBP=133 VF=30Hz
interlace
-----------------------------------------------------------------
Screen 4:3
1776x1000i
Generic timing details for 1776x1000:
HFP=166 HSW=88 HBP=274 HF=34KHz VFP=44VSW=5 VBP=76 VF=30Hz
interlace
------------------------------------------------------------------
Screen 4:3
1920x1080i
Generic timing details for 1920x1080:
HFP=180 HSW=144 HBP=244 HF=34KHz VFP=24VSW=2 VBP=20 VF=30Hz
interlace
***************************************
480p timings
***************************************
Screen 4:3
640x480p
Generic timing details for 640x480:
HFP=55 HSW=96 HBP=57 HF=32KHz VFP=11 VSW=5VBP=29 VF=60Hz
-------------------------------------------------------
Screen 4:3
720x480p
Generic timing details for 720x480:
HFP=67 HSW=96 HBP=85 HF=32KHz VFP=21 VSW=5VBP=19 VF=60Hz
--------------------------------------------------------
Screen 4:3
1440x480p
Generic timing details for 1440x480:
HFP=118 HSW=144 HBP=218 HF=32KHz VFP=13VSW=5 VBP=27 VF=60Hz
--------------------------------------------------------
重新编译内核烧入板子中，就可以正常显示；