drm/i915/display: Program PSR2 selective fetch registers

Another step towards PSR2 selective fetch, here programming plane
selective fetch registers and MAN_TRK_CTL enabling selective fetch but
for now it is fetching the whole area of the planes.
The damaged area calculation will come as next and final step.

v2:
- removed warn on when no plane is visible in state
- removed calculations using plane damaged area in
intel_psr2_program_plane_sel_fetch()

v3:
- do not shift 16 positions the plane dst coordinates, only src is
shifted

v4:
- only setting PLANE_SEL_FETCH_CTL_ENABLE and MCURSOR_MODE in
PLANE_SEL_FETCH_CTL

v5:
- not masking bits for cursor

BSpec: 55229
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201007195238.53955-3-jose.souza@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -11869,6 +11869,9 @@ static void i9xx_update_cursor(struct intel_plane *plane,
 	if (INTEL_GEN(dev_priv) >= 9)
 		skl_write_cursor_wm(plane, crtc_state);
 
+	if (!needs_modeset(crtc_state))
+		intel_psr2_program_plane_sel_fetch(plane, crtc_state, plane_state, 0);
+
 	if (plane->cursor.base != base ||
 	    plane->cursor.size != fbc_ctl ||
 	    plane->cursor.cntl != cntl) {
@@ -12880,8 +12883,11 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 
 	}
 
-	if (!mode_changed)
-		intel_psr2_sel_fetch_update(state, crtc);
+	if (!mode_changed) {
+		ret = intel_psr2_sel_fetch_update(state, crtc);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

drivers/gpu/drm/i915/display/intel_psr.c

@@ -1166,6 +1166,38 @@ static void psr_force_hw_tracking_exit(struct drm_i915_private *dev_priv)
 		intel_psr_exit(dev_priv);
 }
 
+void intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
+					const struct intel_crtc_state *crtc_state,
+					const struct intel_plane_state *plane_state,
+					int color_plane)
+{
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
+	enum pipe pipe = plane->pipe;
+	u32 val;
+
+	if (!crtc_state->enable_psr2_sel_fetch)
+		return;
+
+	val = plane_state ? plane_state->ctl : 0;
+	val &= plane->id == PLANE_CURSOR ? val : PLANE_SEL_FETCH_CTL_ENABLE;
+	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_CTL(pipe, plane->id), val);
+	if (!val || plane->id == PLANE_CURSOR)
+		return;
+
+	val = plane_state->uapi.dst.y1 << 16 | 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;
+	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_width(&plane_state->uapi.src) >> 16) - 1;
+	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_SIZE(pipe, plane->id), val);
+}
+
 void intel_psr2_program_trans_man_trk_ctl(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -1180,16 +1212,91 @@ void intel_psr2_program_trans_man_trk_ctl(const struct intel_crtc_state *crtc_st
 		       crtc_state->psr2_man_track_ctl);
 }
 
-void intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
-				 struct intel_crtc *crtc)
+static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
+				  struct drm_rect *clip, bool full_update)
+{
+	u32 val = PSR2_MAN_TRK_CTL_ENABLE;
+
+	if (full_update) {
+		val |= PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
+		goto exit;
+	}
+
+	if (clip->y1 == -1)
+		goto exit;
+
+	val |= PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE;
+	val |= PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR(clip->y1 / 4 + 1);
+	val |= PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR(DIV_ROUND_UP(clip->y2, 4) + 1);
+exit:
+	crtc_state->psr2_man_track_ctl = val;
+}
+
+static void clip_area_update(struct drm_rect *overlap_damage_area,
+			     struct drm_rect *damage_area)
+{
+	if (overlap_damage_area->y1 == -1) {
+		overlap_damage_area->y1 = damage_area->y1;
+		overlap_damage_area->y2 = damage_area->y2;
+		return;
+	}
+
+	if (damage_area->y1 < overlap_damage_area->y1)
+		overlap_damage_area->y1 = damage_area->y1;
+
+	if (damage_area->y2 > overlap_damage_area->y2)
+		overlap_damage_area->y2 = damage_area->y2;
+}
+
+int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
+				struct intel_crtc *crtc)
 {
 	struct intel_crtc_state *crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_plane_state *new_plane_state, *old_plane_state;
+	struct drm_rect pipe_clip = { .y1 = -1 };
+	struct intel_plane *plane;
+	bool full_update = false;
+	int i, ret;
 
 	if (!crtc_state->enable_psr2_sel_fetch)
-		return;
+		return 0;
+
+	ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
+	if (ret)
+		return ret;
+
+	for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
+					     new_plane_state, i) {
+		struct drm_rect temp;
+
+		if (new_plane_state->uapi.crtc != crtc_state->uapi.crtc)
+			continue;
 
-	crtc_state->psr2_man_track_ctl = PSR2_MAN_TRK_CTL_ENABLE |
-					 PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
+		/*
+		 * TODO: Not clear how to handle planes with negative position,
+		 * also planes are not updated if they have a negative X
+		 * position so for now doing a full update in this cases
+		 */
+		if (new_plane_state->uapi.dst.y1 < 0 ||
+		    new_plane_state->uapi.dst.x1 < 0) {
+			full_update = true;
+			break;
+		}
+
+		if (!new_plane_state->uapi.visible)
+			continue;
+
+		/*
+		 * 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;
+		clip_area_update(&pipe_clip, &temp);
+	}
+
+	psr2_man_trk_ctl_calc(crtc_state, &pipe_clip, full_update);
+	return 0;
 }
 
 /**

drivers/gpu/drm/i915/display/intel_psr.h

@@ -15,6 +15,8 @@ struct intel_crtc_state;
 struct intel_dp;
 struct intel_crtc;
 struct intel_atomic_state;
+struct intel_plane_state;
+struct intel_plane;
 
 #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
 void intel_psr_init_dpcd(struct intel_dp *intel_dp);
@@ -45,8 +47,12 @@ void intel_psr_atomic_check(struct drm_connector *connector,
 			    struct drm_connector_state *old_state,
 			    struct drm_connector_state *new_state);
 void intel_psr_set_force_mode_changed(struct intel_dp *intel_dp);
-void intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
-				 struct intel_crtc *crtc);
+int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
+				struct intel_crtc *crtc);
 void intel_psr2_program_trans_man_trk_ctl(const struct intel_crtc_state *crtc_state);
+void intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
+					const struct intel_crtc_state *crtc_state,
+					const struct intel_plane_state *plane_state,
+					int color_plane);
 
 #endif /* __INTEL_PSR_H__ */

drivers/gpu/drm/i915/display/intel_sprite.c

@@ -731,6 +731,9 @@ skl_program_plane(struct intel_plane *plane,
 		intel_de_write_fw(dev_priv, PLANE_AUX_OFFSET(pipe, plane_id),
 				  (plane_state->color_plane[1].y << 16) | plane_state->color_plane[1].x);
 
+	if (!drm_atomic_crtc_needs_modeset(&crtc_state->uapi))
+		intel_psr2_program_plane_sel_fetch(plane, crtc_state, plane_state, color_plane);
+
 	/*
 	 * The control register self-arms if the plane was previously
 	 * disabled. Try to make the plane enable atomic by writing