openwrt/target/linux/bcm27xx/patches-6.6/950-0587-drm-vc4-hvs-Use-switch-statement-to-simplify-vc4_hvs.patch

From 43c5632ea7b6b4dfc8f7d411003bf0cf030b4263 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Fri, 17 Feb 2023 15:07:29 +0100
Subject: [PATCH 0587/1085] drm/vc4: hvs: Use switch statement to simplify
 vc4_hvs_get_fifo_from_output

Since we'll support BCM2712 soon, let's move the logic behind
vc4_hvs_get_fifo_from_output() to a switch to extend it more easily.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hvs.c | 80 +++++++++++++++++++----------------
 1 file changed, 43 insertions(+), 37 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -625,57 +625,63 @@ int vc4_hvs_get_fifo_from_output(struct
 	u32 reg;
 	int ret;
 
-	if (vc4->gen == VC4_GEN_4)
+	switch (vc4->gen) {
+	case VC4_GEN_4:
 		return output;
 
-	/*
-	 * NOTE: We should probably use drm_dev_enter()/drm_dev_exit()
-	 * here, but this function is only used during the DRM device
-	 * initialization, so we should be fine.
-	 */
-
-	switch (output) {
-	case 0:
-		return 0;
-
-	case 1:
-		return 1;
-
-	case 2:
-		reg = HVS_READ(SCALER_DISPECTRL);
-		ret = FIELD_GET(SCALER_DISPECTRL_DSP2_MUX_MASK, reg);
-		if (ret == 0)
-			return 2;
-
-		return 0;
-
-	case 3:
-		reg = HVS_READ(SCALER_DISPCTRL);
-		ret = FIELD_GET(SCALER_DISPCTRL_DSP3_MUX_MASK, reg);
-		if (ret == 3)
-			return -EPIPE;
-
-		return ret;
-
-	case 4:
-		reg = HVS_READ(SCALER_DISPEOLN);
-		ret = FIELD_GET(SCALER_DISPEOLN_DSP4_MUX_MASK, reg);
-		if (ret == 3)
-			return -EPIPE;
+	case VC4_GEN_5:
+		/*
+		 * NOTE: We should probably use
+		 * drm_dev_enter()/drm_dev_exit() here, but this
+		 * function is only used during the DRM device
+		 * initialization, so we should be fine.
+		 */
+
+		switch (output) {
+		case 0:
+			return 0;
+
+		case 1:
+			return 1;
+
+		case 2:
+			reg = HVS_READ(SCALER_DISPECTRL);
+			ret = FIELD_GET(SCALER_DISPECTRL_DSP2_MUX_MASK, reg);
+			if (ret == 0)
+				return 2;
+
+			return 0;
+
+		case 3:
+			reg = HVS_READ(SCALER_DISPCTRL);
+			ret = FIELD_GET(SCALER_DISPCTRL_DSP3_MUX_MASK, reg);
+			if (ret == 3)
+				return -EPIPE;
+
+			return ret;
+
+		case 4:
+			reg = HVS_READ(SCALER_DISPEOLN);
+			ret = FIELD_GET(SCALER_DISPEOLN_DSP4_MUX_MASK, reg);
+			if (ret == 3)
+				return -EPIPE;
+
+			return ret;
+
+		case 5:
+			reg = HVS_READ(SCALER_DISPDITHER);
+			ret = FIELD_GET(SCALER_DISPDITHER_DSP5_MUX_MASK, reg);
+			if (ret == 3)
+				return -EPIPE;
 
-		return ret;
+			return ret;
 
-	case 5:
-		reg = HVS_READ(SCALER_DISPDITHER);
-		ret = FIELD_GET(SCALER_DISPDITHER_DSP5_MUX_MASK, reg);
-		if (ret == 3)
+		default:
 			return -EPIPE;
-
-		return ret;
-
-	default:
-		return -EPIPE;
+		}
 	}
+
+	return -EPIPE;
 }
 
 static int vc4_hvs_init_channel(struct vc4_hvs *hvs, struct drm_crtc *crtc,