HI, > -----Original Message----- > From: Intel-gfx [mailto:intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of > Ville Syrjälä > Sent: perjantai 8. syyskuuta 2017 17.55 > To: Srinivas, Vidya <vidya.srinivas@xxxxxxxxx> > Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH] drm/i915: Enable scanline read for gen9 dsi > > > Another thought that just occurred to me: Maybe we could use these > timestamps as a workaround for the DDI "scanline reads as 0 at the wrong > time" problem. What we could do is check of the scanline counter reads as 0, > and if it does we could switch over to checking the timestamps instead. Not > sure if we should just do the full timestamp based scanline read like you do > here, or we could just check that if the timestamps look like they're close to > vblank_start we just return vblank_start-1. This could then remove the > obnoxious retry loop from the scanline counter read. > Also please use trybot also as dsi system not in pw runs due to known issue. > -- > Ville Syrjälä > Intel OTC Jani Saarinen Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
