i'm working to setting Linux configuration on iMX6D to drive by parallel RGB output a triple DAC converter for analog RGB (ADV7123), from here a AD7125 to convert analog RGB to CVBS pal format.
Until analog RGB output it's all ok and simple to set VGA output standards, but when i need a composite video output on PAL format i find problems on signal timing generation.
All it's ok on sync timing until the configuration is in "non interlaced mode", when i switch to interlaced mode (odd frame first) )the sync singnal disappear, just some spike of 100nS, but any value into sync lenght configuration does't change the output.
Here the config i'm using on Linux 3.0.35, any suggestion ?
/* PAL TV output */
"TV-PAL", 50, 720, 576, 74074,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_INTERLACED | FB_VMODE_ODD_FLD_FIRST,