disp: msm: sde: setup blend configuration per stage

This change calls setup on blend configuration per stage
instead of per plane per crtc mixer. This avoids unnecessary
register programming if two planes are in the same stage.

Change-Id: I7481270edad13a4182352e72d5d2ab8941de0ae5
Signed-off-by: Samantha Tran <[email protected]>

msm/sde/sde_crtc.c

@@ -1353,6 +1353,37 @@ static void __sde_crtc_assign_active_cfg(struct sde_crtc *sdecrtc,
 	sdecrtc->active_cfg.stage[i][0] = sde_plane_pipe(plane);
 }
 
+static void _sde_crtc_setup_blend_cfg_by_stage(struct sde_crtc_mixer *mixer,
+		int num_mixers, struct plane_state *pstates, int cnt)
+{
+	int i, lm_idx;
+	struct sde_format *format;
+	bool blend_stage[SDE_STAGE_MAX] = { false };
+	u32 blend_type;
+
+	for (i = cnt - 1; i >= 0; i--) {
+		blend_type = sde_plane_get_property(pstates[i].sde_pstate,
+				PLANE_PROP_BLEND_OP);
+		/* stage has already been programmed or BLEND_OP_SKIP type */
+		if (blend_stage[pstates[i].sde_pstate->stage] ||
+				blend_type == SDE_DRM_BLEND_OP_SKIP)
+			continue;
+
+		for (lm_idx = 0; lm_idx < num_mixers; lm_idx++) {
+			format = to_sde_format(msm_framebuffer_format(
+					pstates[i].sde_pstate->base.fb));
+			if (!format) {
+				SDE_ERROR("invalid format\n");
+				return;
+			}
+
+			_sde_crtc_setup_blend_cfg(mixer + lm_idx,
+					pstates[i].sde_pstate, format);
+			blend_stage[pstates[i].sde_pstate->stage] = true;
+		}
+	}
+}
+
 static void _sde_crtc_blend_setup_mixer(struct drm_crtc *crtc,
 		struct drm_crtc_state *old_state, struct sde_crtc *sde_crtc,
 		struct sde_crtc_mixer *mixer)
@@ -1448,12 +1479,8 @@ static void _sde_crtc_blend_setup_mixer(struct drm_crtc *crtc,
 				format->base.pixel_format,
 				fb ? fb->modifier : 0);
 
-			/* blend config update */
 			for (lm_idx = 0; lm_idx < sde_crtc->num_mixers;
 							lm_idx++) {
-				_sde_crtc_setup_blend_cfg(mixer + lm_idx,
-						pstate, format);
-
 				if (bg_alpha_enable && !format->alpha_enable)
 					mixer[lm_idx].mixer_op_mode = 0;
 				else
@@ -1478,6 +1505,10 @@ static void _sde_crtc_blend_setup_mixer(struct drm_crtc *crtc,
 		cnt++;
 	}
 
+	/* blend config update */
+	_sde_crtc_setup_blend_cfg_by_stage(mixer, sde_crtc->num_mixers,
+			pstates, cnt);
+
 	sort(pstates, cnt, sizeof(pstates[0]), pstate_cmp, NULL);
 	_sde_crtc_set_src_split_order(crtc, pstates, cnt);