drm/i915: Precompute static ddi_pll_sel values in encoders

This way only the dynamic WRPLL selection for hdmi ddi mode is
done in intel_ddi_pll_select.

v2: Don't clobber the precomputed values when selecting clocks fro
hdmi encoders.
v3 (from Paulo): Rebase on top of the s/IS_HASWELL/HAS_DDI/ patch.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_crt.c

@@ -315,8 +315,10 @@ static bool intel_crt_compute_config(struct intel_encoder *encoder,
 		pipe_config->pipe_bpp = 24;
 
 	/* FDI must always be 2.7 GHz */
-	if (HAS_DDI(dev))
+	if (HAS_DDI(dev)) {
+		pipe_config->ddi_pll_sel = PORT_CLK_SEL_SPLL;
 		pipe_config->port_clock = 135000 * 2;
+	}
 
 	return true;
 }

drivers/gpu/drm/i915/intel_ddi.c

@@ -403,6 +403,7 @@ void intel_ddi_put_crtc_pll(struct drm_crtc *crtc)
 			I915_WRITE(WRPLL_CTL1, val & ~WRPLL_PLL_ENABLE);
 			POSTING_READ(WRPLL_CTL1);
 		}
+		intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_NONE;
 		break;
 	case PORT_CLK_SEL_WRPLL2:
 		plls->wrpll2_refcount--;
@@ -413,13 +414,12 @@ void intel_ddi_put_crtc_pll(struct drm_crtc *crtc)
 			I915_WRITE(WRPLL_CTL2, val & ~WRPLL_PLL_ENABLE);
 			POSTING_READ(WRPLL_CTL2);
 		}
+		intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_NONE;
 		break;
 	}
 
 	WARN(plls->wrpll1_refcount < 0, "Invalid WRPLL1 refcount\n");
 	WARN(plls->wrpll2_refcount < 0, "Invalid WRPLL2 refcount\n");
-
-	intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_NONE;
 }
 
 #define LC_FREQ 2700
@@ -739,7 +739,6 @@ bool intel_ddi_pll_select(struct intel_crtc *intel_crtc)
 {
 	struct drm_crtc *crtc = &intel_crtc->base;
 	struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
-	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_i915_private *dev_priv = crtc->dev->dev_private;
 	struct intel_ddi_plls *plls = &dev_priv->ddi_plls;
 	int type = intel_encoder->type;
@@ -748,26 +747,7 @@ bool intel_ddi_pll_select(struct intel_crtc *intel_crtc)
 
 	intel_ddi_put_crtc_pll(crtc);
 
-	if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
-
-		switch (intel_dp->link_bw) {
-		case DP_LINK_BW_1_62:
-			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
-			break;
-		case DP_LINK_BW_2_7:
-			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
-			break;
-		case DP_LINK_BW_5_4:
-			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
-			break;
-		default:
-			DRM_ERROR("Link bandwidth %d unsupported\n",
-				  intel_dp->link_bw);
-			return false;
-		}
-
-	} else if (type == INTEL_OUTPUT_HDMI) {
+	if (type == INTEL_OUTPUT_HDMI) {
 		uint32_t reg, val;
 		unsigned p, n2, r2;
 
@@ -808,14 +788,6 @@ bool intel_ddi_pll_select(struct intel_crtc *intel_crtc)
 			plls->wrpll2_refcount++;
 			intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_WRPLL2;
 		}
-
-	} else if (type == INTEL_OUTPUT_ANALOG) {
-		DRM_DEBUG_KMS("Using SPLL on pipe %c\n",
-			      pipe_name(pipe));
-		intel_crtc->config.ddi_pll_sel = PORT_CLK_SEL_SPLL;
-	} else {
-		WARN(1, "Invalid DDI encoder type %d\n", type);
-		return false;
 	}
 
 	return true;

drivers/gpu/drm/i915/intel_dp.c

@@ -745,6 +745,22 @@ intel_dp_connector_unregister(struct intel_connector *intel_connector)
 	intel_connector_unregister(intel_connector);
 }
 
+static void
+hsw_dp_set_ddi_pll_sel(struct intel_crtc_config *pipe_config, int link_bw)
+{
+	switch (link_bw) {
+	case DP_LINK_BW_1_62:
+		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
+		break;
+	case DP_LINK_BW_2_7:
+		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
+		break;
+	case DP_LINK_BW_5_4:
+		pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
+		break;
+	}
+}
+
 static void
 intel_dp_set_clock(struct intel_encoder *encoder,
 		   struct intel_crtc_config *pipe_config, int link_bw)
@@ -756,8 +772,6 @@ intel_dp_set_clock(struct intel_encoder *encoder,
 	if (IS_G4X(dev)) {
 		divisor = gen4_dpll;
 		count = ARRAY_SIZE(gen4_dpll);
-	} else if (HAS_DDI(dev)) {
-		/* Haswell has special-purpose DP DDI clocks. */
 	} else if (HAS_PCH_SPLIT(dev)) {
 		divisor = pch_dpll;
 		count = ARRAY_SIZE(pch_dpll);
@@ -928,7 +942,10 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 				&pipe_config->dp_m2_n2);
 	}
 
-	intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
+	if (HAS_DDI(dev))
+		hsw_dp_set_ddi_pll_sel(pipe_config, intel_dp->link_bw);
+	else
+		intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
 
 	return true;
 }