On Thu, Oct 3, 2019 at 12:21 PM Icenowy Zheng <icenowy@xxxxxxx> wrote: > > > > 于 2019年10月3日 GMT+08:00 下午2:45:21, Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> 写到: > >The LCD timing definitions between Linux DRM vs Allwinner are > >different, > >below diagram shows this clear differences. > > > > Active Front Sync Back > > Region Porch Porch > ><-----------------------><----------------><--------------><--------------> > > //////////////////////| > > ////////////////////// | > >////////////////////// |.................. > >................ > > ________________ > ><----- [hv]display -----> > ><------------- [hv]sync_start ------------> > ><--------------------- [hv]sync_end ----------------------> > ><-------------------------------- [hv]total > >------------------------------> > > > ><----- lcd_[xy] --------> <- lcd_[hv]spw -> > > <---------- lcd_[hv]bp ---------> > ><-------------------------------- lcd_[hv]t > >------------------------------> > > > >The DSI driver misinterpreted the hbp term from the BSP code to refer > >only to the backporch, when in fact it was backporch + sync. Thus the > >driver incorrectly used the horizontal front porch plus sync in its > >calculation of the DRQ set bit value, when it should not have included > >the sync timing. > > > >Including additional sync timings leads to flip_done timed out as: > > I don't think attaching this error infomation is useful at all. Since the error would be common irrespective of panels and it would trigger from dsi controller, I thought this would be useful for reference. I have had this conversation in previous version changes, so I have added it. let me know if have any comments. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
