On Mon, 08 Feb 2016, Matt Roper <matthew.d.roper@xxxxxxxxx> wrote: > Due to our lack of two-step watermark programming, our driver has > historically pretended that the cursor plane is always on for the > purpose of watermark calculations; this helps avoid serious flickering > when the cursor turns off/on (e.g., when the user moves the mouse > pointer to a different screen). That workaround was accidentally > dropped as we started working toward atomic watermark updates. Since we > still aren't quite there yet with two-stage updates, we need to > resurrect the workaround and treat the cursor as always active. > > v2: Tweak cursor width calculations slightly to more closely match the > logic we used before the atomic overhaul began. (Ville) > > Cc: simdev11@xxxxxxxxxxx > Cc: manfred.kitzbichler@xxxxxxxxx > Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx > Reported-by: simdev11@xxxxxxxxxxx > Reported-by: manfred.kitzbichler@xxxxxxxxx > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93892 > Fixes: 43d59eda1 ("drm/i915: Eliminate usage of plane_wm_parameters from ILK-style WM code (v2)") > Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx> > Link: http://patchwork.freedesktop.org/patch/msgid/1454479611-6804-1-git-send-email-matthew.d.roper@xxxxxxxxx > (cherry picked from commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb) > --- > This patch is already merged to dinq, but did not cherry-pick cleanly to -fixes > due to dependence on a separate s/bpp/cpp/ standardization patch. Here's a > version of the patch that should apply to -fixes cleanly. Pushed to drm-intel-fixes, thanks for the patch. BR, Jani. > > drivers/gpu/drm/i915/intel_pm.c | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index eb5fa05..a234687 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -1783,16 +1783,20 @@ static uint32_t ilk_compute_cur_wm(const struct intel_crtc_state *cstate, > const struct intel_plane_state *pstate, > uint32_t mem_value) > { > - int bpp = pstate->base.fb ? pstate->base.fb->bits_per_pixel / 8 : 0; > + /* > + * We treat the cursor plane as always-on for the purposes of watermark > + * calculation. Until we have two-stage watermark programming merged, > + * this is necessary to avoid flickering. > + */ > + int cpp = 4; > + int width = pstate->visible ? pstate->base.crtc_w : 64; > > - if (!cstate->base.active || !pstate->visible) > + if (!cstate->base.active) > return 0; > > return ilk_wm_method2(ilk_pipe_pixel_rate(cstate), > cstate->base.adjusted_mode.crtc_htotal, > - drm_rect_width(&pstate->dst), > - bpp, > - mem_value); > + width, cpp, mem_value); > } > > /* Only for WM_LP. */ -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
