On 05/05/2016 11:12 AM, Andrzej Hajda wrote: > > Regarding the initial question, mode->vrefresh is set in > drm_helper_probe_single_connector_modes. I guess division by zero could > be caused by lack of clock in timings provided by dts timing node. > As I remember in the past dts timings were passed without provided > clock, in such case driver calculated mode->clock for some default value > of vrefresh (60Hz for fimd if I remember correctly). Later validation > code was added and the clock should be always provided. > DTS files were updated after some time and the recalculation code was > removed from fimd driver. So it is possible you are a victim of this change. One more thing, I have looked at Exynos DTS files in mainline. In case of exynos5*.dts files clock-frequency is set to 50000, it is of course insanely low value and vrefresh calculated for such timings will be 0. So please verify if clock-frequency is not too low in your case. Regards Andrzej > > Regarding usage by drivers, from a quick look it seems to be used for > something more than debugging by: > - amdgpu, > - exynos, > - adv7511, > - intel_dp(?), > - mdp5_cmd_encoder(?), > - nouveau, > - omap(?), > - tilcdc. > > Regards > Andrzej > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
