On Thu, Oct 27, 2016 at 08:46:50AM +0100, Tvrtko Ursulin wrote:
>
> On 25/10/2016 13:45, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > Starting from commit b63a16f6cd89 ("drm/i915: Compute display surface
> > offset in the plane check hook for SKL+") we've already rotated the src
> > coordinates by 270 degrees by the time we check if a scaler is needed
> > or not, so we must not account for the rotation a second time.
> > Previously we did these steps in the opposite order and hence the
> > scaler check had to deal with rotation itself. The double rotation
> > handling causes us to enable a scaler pretty much every time 90/270
> > degree plane rotation is requested, leading to fuzzier fonts and whatnot.
> >
> > Cc: Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> > Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx
> > Reported-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> > Fixes: b63a16f6cd89 ("drm/i915: Compute display surface offset in the plane check hook for SKL+")
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_display.c | 14 ++++++++------
> > 1 file changed, 8 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 5a036999487b..587cd604ce92 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -4671,7 +4671,7 @@ static void cpt_verify_modeset(struct drm_device *dev, int pipe)
> >
> > static int
> > skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
> > - unsigned scaler_user, int *scaler_id, unsigned int rotation,
> > + unsigned scaler_user, int *scaler_id,
> > int src_w, int src_h, int dst_w, int dst_h)
> > {
> > struct intel_crtc_scaler_state *scaler_state =
> > @@ -4680,9 +4680,12 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
> > to_intel_crtc(crtc_state->base.crtc);
> > int need_scaling;
> >
> > - need_scaling = drm_rotation_90_or_270(rotation) ?
> > - (src_h != dst_w || src_w != dst_h):
> > - (src_w != dst_w || src_h != dst_h);
> > + /*
> > + * Src coordinates are already rotated by 270 degrees for
> > + * the 90/270 degree plane rotation cases (to match the
> > + * GTT mapping), hence no need to account for rotation here.
> > + */
> > + need_scaling = src_w != dst_w || src_h != dst_h;
> >
> > /*
> > * if plane is being disabled or scaler is no more required or force detach
> > @@ -4749,7 +4752,7 @@ int skl_update_scaler_crtc(struct intel_crtc_state *state)
> > intel_crtc->pipe, SKL_CRTC_INDEX);
> >
> > return skl_update_scaler(state, !state->base.active, SKL_CRTC_INDEX,
> > - &state->scaler_state.scaler_id, DRM_ROTATE_0,
> > + &state->scaler_state.scaler_id,
> > state->pipe_src_w, state->pipe_src_h,
> > adjusted_mode->crtc_hdisplay, adjusted_mode->crtc_vdisplay);
> > }
> > @@ -4783,7 +4786,6 @@ static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
> > ret = skl_update_scaler(crtc_state, force_detach,
> > drm_plane_index(&intel_plane->base),
> > &plane_state->scaler_id,
> > - plane_state->base.rotation,
> > drm_rect_width(&plane_state->base.src) >> 16,
> > drm_rect_height(&plane_state->base.src) >> 16,
> > drm_rect_width(&plane_state->base.dst),
> >
>
> Tested-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> After this only the DRM core revert remains. Is that one something of a
> workaround or actually could get in?
We could add an fb_changed boolean to drm_plane_state which drives can use
to override the drm helper's decision whether to call prepare_plane. And
then i915 could set that if rotation changes.
That's probably the fastest quick fix (but won't type that since I'll be
travelling next week).
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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