[PATCH 23/31] drm/vc4: hvs: Use switch statement to simplify vc4_hvs_get_fifo_from_output

[Dave Stevenson]

From: Maxime Ripard <max...@cerno.tech>

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 <mrip...@kernel.org>
Signed-off-by: Dave Stevenson <dave.steven...@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hvs.c | 77 +++++++++++++++++++----------------
 1 file changed, 42 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index 7380a02a69a2..922e5f73f5d9 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -296,53 +296,60 @@ int vc4_hvs_get_fifo_from_output(struct vc4_hvs *hvs, 
unsigned int output)
        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.
-        */
+       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;
+               switch (output) {
+               case 0:
+                       return 0;
 
-       case 1:
-               return 1;
+               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;
+               case 2:
+                       reg = HVS_READ(SCALER_DISPECTRL);
+                       ret = FIELD_GET(SCALER_DISPECTRL_DSP2_MUX_MASK, reg);
+                       if (ret == 0)
+                               return 2;
 
-               return 0;
+                       return 0;
 
-       case 3:
-               reg = HVS_READ(SCALER_DISPCTRL);
-               ret = FIELD_GET(SCALER_DISPCTRL_DSP3_MUX_MASK, reg);
-               if (ret == 3)
-                       return -EPIPE;
+               case 3:
+                       reg = HVS_READ(SCALER_DISPCTRL);
+                       ret = FIELD_GET(SCALER_DISPCTRL_DSP3_MUX_MASK, reg);
+                       if (ret == 3)
+                               return -EPIPE;
 
-               return ret;
+                       return ret;
 
-       case 4:
-               reg = HVS_READ(SCALER_DISPEOLN);
-               ret = FIELD_GET(SCALER_DISPEOLN_DSP4_MUX_MASK, reg);
-               if (ret == 3)
-                       return -EPIPE;
+               case 4:
+                       reg = HVS_READ(SCALER_DISPEOLN);
+                       ret = FIELD_GET(SCALER_DISPEOLN_DSP4_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)
-                       return -EPIPE;
+               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;
+
+               default:
+                       return -EPIPE;
+               }
 
        default:
                return -EPIPE;
-- 
2.34.1