drm/i915: refactor PCH_DPLL_SEL #defines

The bits are evenly space, so we can cut down on two big switch
blocks. This also greatly simplifies the hw state readout which
follows in the next patch.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -3978,15 +3978,9 @@
 #define PCH_SSC4_AUX_PARMS      0xc6214
 
 #define PCH_DPLL_SEL		0xc7000
-#define  TRANSA_DPLL_ENABLE	(1<<3)
-#define	 TRANSA_DPLLB_SEL	(1<<0)
-#define	 TRANSA_DPLLA_SEL	0
-#define  TRANSB_DPLL_ENABLE	(1<<7)
-#define	 TRANSB_DPLLB_SEL	(1<<4)
-#define	 TRANSB_DPLLA_SEL	(0)
-#define  TRANSC_DPLL_ENABLE	(1<<11)
-#define	 TRANSC_DPLLB_SEL	(1<<8)
-#define	 TRANSC_DPLLA_SEL	(0)
+#define	 TRANS_DPLLB_SEL(pipe)		(1 << (pipe * 4))
+#define	 TRANS_DPLLA_SEL(pipe)		0
+#define  TRANS_DPLL_ENABLE(pipe)	(1 << (pipe * 4 + 3))
 
 /* transcoder */
 

drivers/gpu/drm/i915/intel_display.c

@@ -2986,21 +2986,8 @@ static void ironlake_pch_enable(struct drm_crtc *crtc)
 		u32 sel;
 
 		temp = I915_READ(PCH_DPLL_SEL);
-		switch (pipe) {
-		default:
-		case 0:
-			temp |= TRANSA_DPLL_ENABLE;
-			sel = TRANSA_DPLLB_SEL;
-			break;
-		case 1:
-			temp |= TRANSB_DPLL_ENABLE;
-			sel = TRANSB_DPLLB_SEL;
-			break;
-		case 2:
-			temp |= TRANSC_DPLL_ENABLE;
-			sel = TRANSC_DPLLB_SEL;
-			break;
-		}
+		temp |= TRANS_DPLL_ENABLE(pipe);
+		sel = TRANS_DPLLB_SEL(pipe);
 		if (intel_crtc->config.shared_dpll == DPLL_ID_PCH_PLL_B)
 			temp |= sel;
 		else
@@ -3480,20 +3467,7 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 
 			/* disable DPLL_SEL */
 			temp = I915_READ(PCH_DPLL_SEL);
-			switch (pipe) {
-			case 0:
-				temp &= ~(TRANSA_DPLL_ENABLE | TRANSA_DPLLB_SEL);
-				break;
-			case 1:
-				temp &= ~(TRANSB_DPLL_ENABLE | TRANSB_DPLLB_SEL);
-				break;
-			case 2:
-				/* C shares PLL A or B */
-				temp &= ~(TRANSC_DPLL_ENABLE | TRANSC_DPLLB_SEL);
-				break;
-			default:
-				BUG(); /* wtf */
-			}
+			temp &= ~(TRANS_DPLL_ENABLE(pipe) | TRANS_DPLLB_SEL(pipe));
 			I915_WRITE(PCH_DPLL_SEL, temp);
 		}