[Intel-gfx] [PATCH 18/22] drm/i915: Use struct intel_dp_signal_levels for VLV

[Ander Conselvan de Oliveira]

Use the new struct intel_dp_signal_levels to store voltage swing and pre
emphasis levels for VLV.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
---
 drivers/gpu/drm/i915/intel_dp_signal_levels.c | 38 ++++++++++++++++++---------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp_signal_levels.c b/drivers/gpu/drm/i915/intel_dp_signal_levels.c
index aedd35b..1d07f46 100644
--- a/drivers/gpu/drm/i915/intel_dp_signal_levels.c
+++ b/drivers/gpu/drm/i915/intel_dp_signal_levels.c
@@ -115,7 +115,7 @@ _dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
 	}
 }
 
-static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
+static void vlv_set_signal_levels(struct intel_dp *intel_dp, uint8_t train_set)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -124,7 +124,6 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 		to_intel_crtc(dport->base.base.crtc);
 	unsigned long demph_reg_value, preemph_reg_value,
 		uniqtranscale_reg_value;
-	uint8_t train_set = intel_dp->train_set[0];
 	enum dpio_channel port = vlv_dport_to_channel(dport);
 	int pipe = intel_crtc->pipe;
 
@@ -149,7 +148,8 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 			uniqtranscale_reg_value = 0x5598DA3A;
 			break;
 		default:
-			return 0;
+			MISSING_CASE(train_set & DP_TRAIN_VOLTAGE_SWING_MASK);
+			return;
 		}
 		break;
 	case DP_TRAIN_PRE_EMPH_LEVEL_1:
@@ -168,7 +168,8 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 			uniqtranscale_reg_value = 0x55ADDA3A;
 			break;
 		default:
-			return 0;
+			MISSING_CASE(train_set & DP_TRAIN_VOLTAGE_SWING_MASK);
+			return;
 		}
 		break;
 	case DP_TRAIN_PRE_EMPH_LEVEL_2:
@@ -183,7 +184,8 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 			uniqtranscale_reg_value = 0x55ADDA3A;
 			break;
 		default:
-			return 0;
+			MISSING_CASE(train_set & DP_TRAIN_VOLTAGE_SWING_MASK);
+			return;
 		}
 		break;
 	case DP_TRAIN_PRE_EMPH_LEVEL_3:
@@ -194,11 +196,13 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 			uniqtranscale_reg_value = 0x55ADDA3A;
 			break;
 		default:
-			return 0;
+			MISSING_CASE(train_set & DP_TRAIN_VOLTAGE_SWING_MASK);
+			return;
 		}
 		break;
 	default:
-		return 0;
+		MISSING_CASE(train_set & DP_TRAIN_PRE_EMPHASIS_MASK);
+		return;
 	}
 
 	mutex_lock(&dev_priv->sb_lock);
@@ -211,10 +215,20 @@ static uint32_t vlv_signal_levels(struct intel_dp *intel_dp)
 	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), preemph_reg_value);
 	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x80000000);
 	mutex_unlock(&dev_priv->sb_lock);
-
-	return 0;
 }
 
+static const struct signal_levels vlv_signal_levels = {
+	.max_voltage = DP_TRAIN_VOLTAGE_SWING_LEVEL_3,
+	.max_pre_emph = {
+		DP_TRAIN_PRE_EMPH_LEVEL_3,
+		DP_TRAIN_PRE_EMPH_LEVEL_2,
+		DP_TRAIN_PRE_EMPH_LEVEL_1,
+		DP_TRAIN_PRE_EMPH_LEVEL_0,
+	},
+
+	.set = vlv_set_signal_levels,
+};
+
 static bool chv_need_uniq_trans_scale(uint8_t train_set)
 {
 	return (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) == DP_TRAIN_PRE_EMPH_LEVEL_0 &&
@@ -582,8 +596,6 @@ _update_signal_levels(struct intel_dp *intel_dp)
 			mask = DDI_BUF_EMP_MASK;
 	} else if (IS_CHERRYVIEW(dev)) {
 		signal_levels = chv_signal_levels(intel_dp);
-	} else if (IS_VALLEYVIEW(dev)) {
-		signal_levels = vlv_signal_levels(intel_dp);
 	} else {
 		WARN(1, "Should be calling intel_dp->signal_levels->set instead.");
 		return;
@@ -642,7 +654,9 @@ intel_dp_init_signal_levels(struct intel_dp *intel_dp)
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 	enum port port = intel_dig_port->port;
 
-	if (IS_IVYBRIDGE(dev)) {
+	if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) {
+		intel_dp->signal_levels = &vlv_signal_levels;
+	} else if (IS_IVYBRIDGE(dev)) {
 		if (port == PORT_A)
 			intel_dp->signal_levels = &ivb_edp_signal_levels;
 		else
-- 
2.4.3