[PATCH] drm: parse color format support for digital displays

Adam Jackson ajax at redhat.com
Fri Apr 15 12:36:22 PDT 2011

On 4/15/11 3:19 PM, Jesse Barnes wrote:

> Or is there a CEA block extension that allows for more granularity?

CEA has bits for the two YCbCr formats too, which we should also parse 
since there's plenty of 1.3+CEA blocks in the world thanks to HDMI.  For 
CEA blocks version 2 and up (version number in byte 2 of the CEA block, 
zero-based indexing), (1 << 5) of byte 3 is 4:4:4 and (1 << 4) is 4:2:2. 
  Same byte as what we already check for EDID_BASIC_AUDIO, if that's any 
clearer.  CEA spec contains the same language about always supporting 
RGB though.

I don't have a good answer for what to do if you have a 1.4+CEA block 
and the two bitfields are inconsistent, besides violence against the 
monitor vendor.

- ajax

More information about the dri-devel mailing list