On Wed, 28 Oct 2015, Damien Lespiau <damien.lespiau@xxxxxxxxx> wrote: > On Wed, Oct 28, 2015 at 01:58:55PM +0000, Sharma, Shashank wrote: >> 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@30Hz, >> 3840x2160@25Hz, 3840x2160@24Hz and 4096x2160@24Hz) > > drm_match_hdmi_mode() doesn't return the VIC for the AVI infoframe, but > the VIC for the HDMI vendor specific infoframe. See section 8.2.3 of the > HDMI 1.4 spec. > >> 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. > > That's not the AVI infoframe, that's the HDMI vendor specific infoframe. > >> Please help me to understand if there any specific reason for this, or am >> I missing something in interpretation ? > > Are you seeing a bug? it's totally possible, I've never used an actual > conformance tool when I wrote that code, so it's likely buggy and the > VIC in the AVI infoframe may well be wrong. Possibly relevant https://bugs.freedesktop.org/show_bug.cgi?id=92217 > > -- > Damien > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
