[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
(3f2f653378112c1453c0d83c81746a9225e4bc75)

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
drm_hdmi_vendor_infoframe_from_display_mode.

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

Regards
Shashank


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