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HDMI CEA Display Timings on i.mx6

Question asked by Mark Wilczynski on Nov 15, 2012
Latest reply on Oct 29, 2014 by rabeeh
Branched to a new discussion

Hello,


I'm evaluating the i.mx6 for a media player project and need to know if the system can support the common CEA timings for 1080p video over HDMI connection.

 

I need support for the following display modes:

 

Refresh Rate, Horizontal Active Pixels, Front Porch, Sync Width, Back Porch, Total Pixels, Vertical Active Pixels, Front Porch, Sync Width, Back Porch, Total Pixels, Pixel Clock

23.976Hz, 1920, 638, 44, 148, 2750, 1080, 4, 5, 36, 1125,  74.2500 / 1.001 (= 74.175824175824175824175824175824)

24.000Hz, 1920, 638, 44, 148, 2750, 1080, 4, 5, 36, 1125,  74.2500

25.000Hz, 1920, 528, 44, 148, 2640, 1080, 4, 5, 36, 1125,  74.2500

50.000Hz, 1920, 528, 44, 148, 2640, 1080, 4, 5, 36, 1125, 148.5000

59.940Hz, 1920,  88, 44, 148, 2200, 1080, 4, 5, 36, 1125, 148.5000 / 1.001 (= 148.35164835164835164835164835165)

60.000Hz, 1920,  88, 44, 148, 2200, 1080, 4, 5, 36, 1125, 148.5000


Looking through the available reference manuals and source code for the i.mx6, it appears that all the existing video mode presets are based on a 74.25 or 148.5 Mhz pixel clock.  Does the hardware support a 74.1758/148.3516... clock necessary for the 59.940Hz display modes?


What changes would need to be made to allow the u-boot bootarg parameters to accept the above modes such as:

video=mxcfb0:dev=hdmi,1920x1080M@59,if=RGB24


Thank you.

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