drm/msm/dpu: simplify blend configuration

Rewrite dpu_hw_ctl_setup_blendstage() to use static data configuration
rather than using a switch-case. This simplifies adding support for new
pipes.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550
Patchwork: https://patchwork.freedesktop.org/patch/518485/
Link: https://lore.kernel.org/r/20230116063316.728496-3-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c

@@ -379,14 +379,37 @@ static void dpu_hw_ctl_clear_all_blendstages(struct dpu_hw_ctl *ctx)
 	DPU_REG_WRITE(c, CTL_FETCH_PIPE_ACTIVE, 0);
 }
 
+struct ctl_blend_config {
+	int idx, shift, ext_shift;
+};
+
+static const struct ctl_blend_config ctl_blend_config[][2] = {
+	[SSPP_NONE] = { { -1 }, { -1 } },
+	[SSPP_MAX] =  { { -1 }, { -1 } },
+	[SSPP_VIG0] = { { 0, 0,  0  }, { 3, 0 } },
+	[SSPP_VIG1] = { { 0, 3,  2  }, { 3, 4 } },
+	[SSPP_VIG2] = { { 0, 6,  4  }, { 3, 8 } },
+	[SSPP_VIG3] = { { 0, 26, 6  }, { 3, 12 } },
+	[SSPP_RGB0] = { { 0, 9,  8  }, { -1 } },
+	[SSPP_RGB1] = { { 0, 12, 10 }, { -1 } },
+	[SSPP_RGB2] = { { 0, 15, 12 }, { -1 } },
+	[SSPP_RGB3] = { { 0, 29, 14 }, { -1 } },
+	[SSPP_DMA0] = { { 0, 18, 16 }, { 2, 8 } },
+	[SSPP_DMA1] = { { 0, 21, 18 }, { 2, 12 } },
+	[SSPP_DMA2] = { { 2, 0      }, { 2, 16 } },
+	[SSPP_DMA3] = { { 2, 4      }, { 2, 20 } },
+	[SSPP_DMA4] = { { 4, 0      }, { 4, 8 } },
+	[SSPP_DMA5] = { { 4, 4      }, { 4, 12 } },
+	[SSPP_CURSOR0] =  { { 1, 20 }, { -1 } },
+	[SSPP_CURSOR1] =  { { 1, 26 }, { -1 } },
+};
+
 static void dpu_hw_ctl_setup_blendstage(struct dpu_hw_ctl *ctx,
 	enum dpu_lm lm, struct dpu_hw_stage_cfg *stage_cfg)
 {
 	struct dpu_hw_blk_reg_map *c = &ctx->hw;
 	u32 mix, ext, mix_ext;
-	u32 mixercfg = 0, mixercfg_ext = 0;
-	u32 mixercfg_ext2 = 0, mixercfg_ext3 = 0;
-	u32 mixercfg_ext4 = 0;
+	u32 mixercfg[5] = { 0 };
 	int i, j;
 	int stages;
 	int pipes_per_stage;
@@ -401,7 +424,7 @@ static void dpu_hw_ctl_setup_blendstage(struct dpu_hw_ctl *ctx,
 	else
 		pipes_per_stage = 1;
 
-	mixercfg = CTL_MIXER_BORDER_OUT; /* always set BORDER_OUT */
+	mixercfg[0] = CTL_MIXER_BORDER_OUT; /* always set BORDER_OUT */
 
 	if (!stage_cfg)
 		goto exit;
@@ -415,119 +438,30 @@ static void dpu_hw_ctl_setup_blendstage(struct dpu_hw_ctl *ctx,
 		for (j = 0 ; j < pipes_per_stage; j++) {
 			enum dpu_sspp_multirect_index rect_index =
 				stage_cfg->multirect_index[i][j];
-
-			switch (stage_cfg->stage[i][j]) {
-			case SSPP_VIG0:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext3 |= mix_ext << 0;
-				} else {
-					mixercfg |= mix << 0;
-					mixercfg_ext |= ext << 0;
-				}
-				break;
-			case SSPP_VIG1:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext3 |= mix_ext << 4;
-				} else {
-					mixercfg |= mix << 3;
-					mixercfg_ext |= ext << 2;
-				}
-				break;
-			case SSPP_VIG2:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext3 |= mix_ext << 8;
-				} else {
-					mixercfg |= mix << 6;
-					mixercfg_ext |= ext << 4;
-				}
-				break;
-			case SSPP_VIG3:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext3 |= mix_ext << 12;
-				} else {
-					mixercfg |= mix << 26;
-					mixercfg_ext |= ext << 6;
-				}
-				break;
-			case SSPP_RGB0:
-				mixercfg |= mix << 9;
-				mixercfg_ext |= ext << 8;
-				break;
-			case SSPP_RGB1:
-				mixercfg |= mix << 12;
-				mixercfg_ext |= ext << 10;
-				break;
-			case SSPP_RGB2:
-				mixercfg |= mix << 15;
-				mixercfg_ext |= ext << 12;
-				break;
-			case SSPP_RGB3:
-				mixercfg |= mix << 29;
-				mixercfg_ext |= ext << 14;
-				break;
-			case SSPP_DMA0:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext2 |= mix_ext << 8;
-				} else {
-					mixercfg |= mix << 18;
-					mixercfg_ext |= ext << 16;
-				}
-				break;
-			case SSPP_DMA1:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext2 |= mix_ext << 12;
-				} else {
-					mixercfg |= mix << 21;
-					mixercfg_ext |= ext << 18;
-				}
-				break;
-			case SSPP_DMA2:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext2 |= mix_ext << 16;
-				} else {
-					mixercfg_ext2 |= mix_ext << 0;
-				}
-				break;
-			case SSPP_DMA3:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext2 |= mix_ext << 20;
-				} else {
-					mixercfg_ext2 |= mix_ext << 4;
-				}
-				break;
-			case SSPP_DMA4:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext4 |= mix_ext << 8;
-				} else {
-					mixercfg_ext4 |= mix_ext << 0;
-				}
-				break;
-			case SSPP_DMA5:
-				if (rect_index == DPU_SSPP_RECT_1) {
-					mixercfg_ext4 |= mix_ext << 12;
-				} else {
-					mixercfg_ext4 |= mix_ext << 4;
-				}
-				break;
-			case SSPP_CURSOR0:
-				mixercfg_ext |= mix_ext << 20;
-				break;
-			case SSPP_CURSOR1:
-				mixercfg_ext |= mix_ext << 26;
-				break;
-			default:
-				break;
+			enum dpu_sspp pipe = stage_cfg->stage[i][j];
+			const struct ctl_blend_config *cfg =
+				&ctl_blend_config[pipe][rect_index == DPU_SSPP_RECT_1];
+
+			/*
+			 * CTL_LAYER has 3-bit field (and extra bits in EXT register),
+			 * all EXT registers has 4-bit fields.
+			 */
+			if (cfg->idx == 0) {
+				mixercfg[0] |= mix << cfg->shift;
+				mixercfg[1] |= ext << cfg->ext_shift;
+			} else {
+				mixercfg[cfg->idx] |= mix_ext << cfg->shift;
 			}
 		}
 	}
 
 exit:
-	DPU_REG_WRITE(c, CTL_LAYER(lm), mixercfg);
-	DPU_REG_WRITE(c, CTL_LAYER_EXT(lm), mixercfg_ext);
-	DPU_REG_WRITE(c, CTL_LAYER_EXT2(lm), mixercfg_ext2);
-	DPU_REG_WRITE(c, CTL_LAYER_EXT3(lm), mixercfg_ext3);
+	DPU_REG_WRITE(c, CTL_LAYER(lm), mixercfg[0]);
+	DPU_REG_WRITE(c, CTL_LAYER_EXT(lm), mixercfg[1]);
+	DPU_REG_WRITE(c, CTL_LAYER_EXT2(lm), mixercfg[2]);
+	DPU_REG_WRITE(c, CTL_LAYER_EXT3(lm), mixercfg[3]);
 	if ((test_bit(DPU_CTL_HAS_LAYER_EXT4, &ctx->caps->features)))
-		DPU_REG_WRITE(c, CTL_LAYER_EXT4(lm), mixercfg_ext4);
+		DPU_REG_WRITE(c, CTL_LAYER_EXT4(lm), mixercfg[4]);
 }