[Intel-gfx] [PATCH v2 1/6] drm/i915/display/psr: Calculate selective fetch plane registers

[Souza, Jose]

On Thu, 2020-10-29 at 21:37 +0000, Mun, Gwan-gyeong wrote:
> On Tue, 2020-10-27 at 16:45 -0700, José Roberto de Souza wrote:
> > Add the calculations to set plane selective fetch registers depending
> > in the value of the area damaged.
> > It is still using the whole plane area as damaged but that will
> > change
> > in next patches.
> > 
> > v2:
> > - fixed new_plane_state->uapi.dst.y2 typo in
> > intel_psr2_sel_fetch_update()
> > - do not shifthing new_plane_state->uapi.dst only src is in 16.16
> > format
> > 
> > BSpec: 55229
> > Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  .../drm/i915/display/intel_display_types.h    |  2 ++
> >  drivers/gpu/drm/i915/display/intel_psr.c      | 22 ++++++++++++++---
> > --
> >  2 files changed, 18 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> > b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index f6f0626649e0..3f2707d882cc 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -604,6 +604,8 @@ struct intel_plane_state {
> >  	u32 planar_slave;
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  	struct drm_intel_sprite_colorkey ckey;
> > +
> > +	struct drm_rect psr2_sel_fetch_area;
> >  };
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  struct intel_initial_plane_config {
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index b2544102e7b1..6dead51d7a81 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -1187,6 +1187,7 @@ void intel_psr2_program_plane_sel_fetch(struct
> > intel_plane *plane,
> >  {
> >  	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
> >  	enum pipe pipe = plane->pipe;
> > +	const struct drm_rect *clip;
> >  	u32 val;
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  	if (!crtc_state->enable_psr2_sel_fetch)
> > @@ -1198,16 +1199,20 @@ void
> > intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
> >  	if (!val || plane->id == PLANE_CURSOR)
> >  		return;
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > -	val = plane_state->uapi.dst.y1 << 16 | plane_state-
> > > uapi.dst.x1;
> > +	clip = &plane_state->psr2_sel_fetch_area;
> > +
> > +	val = (clip->y1 + plane_state->uapi.dst.y1) << 16;
> > +	val |= plane_state->uapi.dst.x1;
> >  	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_POS(pipe, plane-
> > > id), val);
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > -	val = plane_state->color_plane[color_plane].y << 16;
> > +	/* TODO: consider tiling and auxiliary surfaces */
> > +	val = (clip->y1 + plane_state->color_plane[color_plane].y) <<
> > 16;
> >  	val |= plane_state->color_plane[color_plane].x;
> >  	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_OFFSET(pipe, plane-
> > > id),
> >  			  val);
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  	/* Sizes are 0 based */
> > -	val = ((drm_rect_height(&plane_state->uapi.src) >> 16) - 1) <<
> > 16;
> > +	val = (drm_rect_height(clip) - 1) << 16;
> >  	val |= (drm_rect_width(&plane_state->uapi.src) >> 16) - 1;
> >  	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_SIZE(pipe, plane-
> > > id), val);
> >  }
> > @@ -1281,7 +1286,7 @@ int intel_psr2_sel_fetch_update(struct
> > intel_atomic_state *state,
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  	for_each_oldnew_intel_plane_in_state(state, plane,
> > old_plane_state,
> >  					     new_plane_state, i) {
> > -		struct drm_rect temp;
> > +		struct drm_rect *sel_fetch_area, temp;
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
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> > 
> > 
> > 
> > 
> >  		if (new_plane_state->uapi.crtc != crtc_state-
> > > uapi.crtc)
> >  			continue;
> > @@ -1304,8 +1309,13 @@ int intel_psr2_sel_fetch_update(struct
> > intel_atomic_state *state,
> >  		 * For now doing a selective fetch in the whole plane
> > area,
> >  		 * optimizations will come in the future.
> >  		 */
> > -		temp.y1 = new_plane_state->uapi.dst.y1;
> > -		temp.y2 = new_plane_state->uapi.dst.y2;
> > +		sel_fetch_area = &new_plane_state->psr2_sel_fetch_area;
> > +		sel_fetch_area->y1 = new_plane_state->uapi.src.y1 >>
> > 16;
> > +		sel_fetch_area->y2 = new_plane_state->uapi.src.y2 >>
> > 16;
> > +
> > +		temp = *sel_fetch_area;
> > +		temp.y1 += new_plane_state->uapi.dst.y1;
> > +		temp.y2 += new_plane_state->uapi.dst.y2;
> when the userspace call drmModeSetPlane(), src_y and crtc_y can be
> differ.
> (drm core uses drm_rect_translate_to() utility function for apply
> coordinate traslate to dst from src. )

Checking drm_atomic_helper_update_plane() it sets userspace values to plane_state->crtc_ and plane_state->src_, then atomic code will set the right
values back to uapi.dst and uapi.src.

> 
> In my opinion, we can calculate like as,
> int coord_trans = new_plane_state->uapi.dst.y1 - new_plane_state-
> > uapi.src.y1 >> 16;
> temp = *sel_fetch_area; // assunes that sel_fetch_area has damage area.
> temp.y1 += coord_trans;
> temp.y2 += coord_trans;

uapi.dst.x1/y1 is the coordinates where plane should be placed in pipe to be combined with other planes(skl_program_plane()), that exactly what we
need to compute the damaged areas of the whole pipe.

> 
> >  		clip_area_update(&pipe_clip, &temp);
> 
> As we don't check and calculate plane rotation and scale for dst
> coordinates here.
> so can you add checking of plane scale or rotation? and if the plane
> has a scale factor or rotation, for now, we should not apply PSR SU.
> (if plane scale or rotation are used, dst might differ. if we don't
> apply PSR SU, we don't need to call clip_area_update() here. )

Rotation is not supported by selective fetch(intel_psr2_sel_fetch_config_valid()) about scale, the scaler HW will take care of adjust the original
size but I doubt that scale works with PSR panels.

> >  	}
> >  
> > 
> > 
> >