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. -- Damien _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
