On Fri, Dec 13, 2019 at 03:34:48PM +0200, Ville Syrjala wrote: > From: Ville Syrjälä <[email protected]> > > icl and tgl are still affected by the modulo 4 PLANE_OFFSET.y > underrun issue. Reject such configurations on all gen9+ platforms. > > Can be reproduced easily with the following sequence of > hardware poking: > while { > write FBC_CTL.enable=1 > wait for vblank > > write PLANE_OFFSET .x=0 .y=32 > write PLANE_SURF > wait for vblank > > # if PLANE_OFFSET.y is multiple of 4 the underrun won't happen > write PLANE_OFFSET .x=0 .y=31 > write PLANE_SURF > wait for vblank > > # extra vblank wait is required here presumably > # to get FBC into the proper state > wait for vblank > > write FBC_CTL.enable=0 > # underrun happens some time after FBC disable > wait for vblank > } > > Both 8888 and 565 pixel formats and all tilinga formats > seem affected. Reproduced on KBL/GLK/ICL/TGL. BDW confirmed > not affected. > > Closes: https://gitlab.freedesktop.org/drm/intel/issues/792 > Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Imre Deak <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_fbc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c > b/drivers/gpu/drm/i915/display/intel_fbc.c > index 6f1d5c032681..a1048ece541e 100644 > --- a/drivers/gpu/drm/i915/display/intel_fbc.c > +++ b/drivers/gpu/drm/i915/display/intel_fbc.c > @@ -776,7 +776,7 @@ static bool intel_fbc_can_activate(struct intel_crtc > *crtc) > * having a Y offset that isn't divisible by 4 causes FIFO underrun > * and screen flicker. > */ > - if (IS_GEN_RANGE(dev_priv, 9, 10) && > + if (INTEL_GEN(dev_priv) >= 9 && > (fbc->state_cache.plane.adjusted_y & 3)) { > fbc->no_fbc_reason = "plane Y offset is misaligned"; > return false; > -- > 2.23.0 > > _______________________________________________ > Intel-gfx mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
