I've added several video modes for LCD (720_P60, 1080_P30, XGA_P60) on di0 parallel port. All are ok excepted one (720_P60):
static struct fb_videomode lcdif_modedb =
/* 1280x720 @ 60 Hz , pixel clk @ 74.25MHz */
"720P60", 60, 1280, 720, 13468, 140, 210, 10, 10, 20, 10,
All sync signals are measured with oscilloscope as expected: Pixclk = 74.25 MHz Hsync = 45 kHz Vsync = 60 Hz
But no data come out from RGB !!! All other modes show data on RGB.
It seems to me since synchro signals are correct, the problem maybe comes from margin parameters (HBP, HFP, ...). But there's seemingly no restriction on these parameters.
An idea ?