On 2024-10-04 11:31:22 [+0300], Ville Syrjälä wrote: > > So once vblank evasion has declared things to be safe we might have > as short a time as VBLANK_EVASION_TIME_US to write all the registers. > If the CPU gets stolen from us at that point we can no longer guarantee > anything. The magic value has been tuned empirically over the years, > until we've found something that seems to work well enough, without > being too long to negatively affect performance. what happens if this gets delayed? Just flicker or worse? Is this something that affects all i915 based HW or only old ones? As far as I remember, there is a register lock which is only required on older HW. Sebastian
