[Intel-gfx] HDMI 4k modes VIC

Sharma, Shashank shashank.sharma at intel.com
Wed Oct 28 06:58:55 PDT 2015

Hi Damien

This is regarding one of the patches:
drm: Add support for alternate clocks of 4k modes

I am seeing that from function drm_match_hdmi_mode we are not returning correct VIC's for 4k modes (listed in edid_4k_modes[])
Looks like we are returning VIC=(1, 2, 3, 4) for 4K modes (3840x2160 at 30Hz, 3840x2160 at 25Hz, 3840x2160 at 24Hz and 4096x2160 at 24Hz)

But as per the CEA-861-F specs, the respective VIC should be (95, 94 and 93). The VIC returned is being used for writing AVI IF in

Please help me to understand if there any specific reason for this, or am I missing something in interpretation ?


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