imx6q 转换LVDS为VGA输出

我们使用ths8136 VGA编码器连接到imx6q的disp0_dat0 ~ dat23。当分辨率小于或等于720p，图像质量好。

然而，如果解决方案是大于720p，像素将运行在100MHz的时钟。我们只需要修改 ipu_disp.c如下就可以解决：

uint32_t rounded_pixel_clk_upper, rounded_pixel_clk_lower;

...

if (rounded_pixel_clk < 100000000) {

rounded_pixel_clk_upper = pixel_clk + pixel_clk/200;

rounded_pixel_clk_lower = pixel_clk - pixel_clk/200;

} else {

rounded_pixel_clk_upper = pixel_clk + pixel_clk/50000;

rounded_pixel_clk_lower = pixel_clk - pixel_clk/50000;

}

if (!sig.int_clk && ((rounded_pixel_clk >= rounded_pixel_clk_upper) ||

(rounded_pixel_clk <= rounded_pixel_clk_lower))) {

dev_dbg(ipu->dev, "try ipu ext di clk\n");

...

然后在修改mxc_lcdif.c :

/* 800x480 @ 60 Hz , pixel clk @ 32MHz */

"SEIKO-WVGA", 60, 800, 480, 29850, 89, 164, 23, 10, 10, 10,

FB_SYNC_CLK_LAT_FALL,

FB_VMODE_NONINTERLACED,

0,},

{

/* 1280x1024 @ 60 Hz , pixel clk @ 108MHz */

"SXGA", 60, 1280, 1024, 9231, 48, 248, 1, 38, 112, 3,

FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_VESA},

{

/* 1920x1080 @ 60 Hz , pixel clk @ 148.5MHz */

"1080P60", 60, 1920, 1080, 7692, 136, 336, 3, 36, 200, 6,

FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_VESA},

{

/* 1920x1200 @ 60 Hz , pixel clk @ 193.16MHz */

"WUXGA", 60, 1920, 1200, 5175, 128, 336, 1, 38, 208, 3,

FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_VESA},

大功告成，开机设置完分辨率就可以正常显示了。