drm/i915/chv: Don't do group access reads from TX lanes either

Like PCS, TX group reads return 0xffffffff. So we need to target each
lane separately if we want to use RMW cycles to update the registers.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -807,6 +807,17 @@ enum punit_power_well {
 #define _TXLANE(ch, lane, offset) ((ch ? 0x2400 : 0) + \
 					(lane) * 0x200 + (offset))
 
+#define CHV_TX_DW0(ch, lane) _TXLANE(ch, lane, 0x80)
+#define CHV_TX_DW1(ch, lane) _TXLANE(ch, lane, 0x84)
+#define CHV_TX_DW2(ch, lane) _TXLANE(ch, lane, 0x88)
+#define CHV_TX_DW3(ch, lane) _TXLANE(ch, lane, 0x8c)
+#define CHV_TX_DW4(ch, lane) _TXLANE(ch, lane, 0x90)
+#define CHV_TX_DW5(ch, lane) _TXLANE(ch, lane, 0x94)
+#define CHV_TX_DW6(ch, lane) _TXLANE(ch, lane, 0x98)
+#define CHV_TX_DW7(ch, lane) _TXLANE(ch, lane, 0x9c)
+#define CHV_TX_DW8(ch, lane) _TXLANE(ch, lane, 0xa0)
+#define CHV_TX_DW9(ch, lane) _TXLANE(ch, lane, 0xa4)
+#define CHV_TX_DW10(ch, lane) _TXLANE(ch, lane, 0xa8)
 #define CHV_TX_DW11(ch, lane) _TXLANE(ch, lane, 0xac)
 #define   DPIO_FRC_LATENCY_SHFIT	8
 #define CHV_TX_DW14(ch, lane) _TXLANE(ch, lane, 0xb8)

drivers/gpu/drm/i915/intel_dp.c

@@ -2311,10 +2311,11 @@ static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
 	struct intel_crtc *intel_crtc = to_intel_crtc(dport->base.base.crtc);
-	u32 deemph_reg_value, margin_reg_value, val, tx_dw2;
+	u32 deemph_reg_value, margin_reg_value, val;
 	uint8_t train_set = intel_dp->train_set[0];
 	enum dpio_channel ch = vlv_dport_to_channel(dport);
-	int pipe = intel_crtc->pipe;
+	enum pipe pipe = intel_crtc->pipe;
+	int i;
 
 	switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
 	case DP_TRAIN_PRE_EMPHASIS_0:
@@ -2392,21 +2393,27 @@ static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp)
 	vlv_dpio_write(dev_priv, pipe, CHV_PCS_DW10(ch), 0);
 
 	/* Program swing deemph */
-	val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW4(ch));
-	val &= ~DPIO_SWING_DEEMPH9P5_MASK;
-	val |= deemph_reg_value << DPIO_SWING_DEEMPH9P5_SHIFT;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(ch), val);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i));
+		val &= ~DPIO_SWING_DEEMPH9P5_MASK;
+		val |= deemph_reg_value << DPIO_SWING_DEEMPH9P5_SHIFT;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val);
+	}
 
 	/* Program swing margin */
-	tx_dw2 = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW2(ch));
-	tx_dw2 &= ~DPIO_SWING_MARGIN_MASK;
-	tx_dw2 |= margin_reg_value << DPIO_SWING_MARGIN_SHIFT;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(ch), tx_dw2);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
+		val &= ~DPIO_SWING_MARGIN_MASK;
+		val |= margin_reg_value << DPIO_SWING_MARGIN_SHIFT;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
+	}
 
 	/* Disable unique transition scale */
-	val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW3(ch));
-	val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(ch), val);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
+		val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
+	}
 
 	if (((train_set & DP_TRAIN_PRE_EMPHASIS_MASK)
 			== DP_TRAIN_PRE_EMPHASIS_0) &&
@@ -2419,12 +2426,18 @@ static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp)
 		 * For now, for this unique transition scale selection, set bit
 		 * 27 for ch0 and ch1.
 		 */
-		val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW3(ch));
-		val |= DPIO_TX_UNIQ_TRANS_SCALE_EN;
-		vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(ch), val);
+		for (i = 0; i < 4; i++) {
+			val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
+			val |= DPIO_TX_UNIQ_TRANS_SCALE_EN;
+			vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
+		}
 
-		tx_dw2 |= (0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT);
-		vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(ch), tx_dw2);
+		for (i = 0; i < 4; i++) {
+			val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
+			val &= ~(0xff << DPIO_UNIQ_TRANS_SCALE_SHIFT);
+			val |= (0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT);
+			vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
+		}
 	}
 
 	/* Start swing calculation */

drivers/gpu/drm/i915/intel_hdmi.c

@@ -1330,20 +1330,26 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
 
 	/* FIXME: Program the support xxx V-dB */
 	/* Use 800mV-0dB */
-	val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW4(ch));
-	val &= ~DPIO_SWING_DEEMPH9P5_MASK;
-	val |= 128 << DPIO_SWING_DEEMPH9P5_SHIFT;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(ch), val);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i));
+		val &= ~DPIO_SWING_DEEMPH9P5_MASK;
+		val |= 128 << DPIO_SWING_DEEMPH9P5_SHIFT;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val);
+	}
 
-	val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW2(ch));
-	val &= ~DPIO_SWING_MARGIN_MASK;
-	val |= 102 << DPIO_SWING_MARGIN_SHIFT;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(ch), val);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
+		val &= ~DPIO_SWING_MARGIN_MASK;
+		val |= 102 << DPIO_SWING_MARGIN_SHIFT;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
+	}
 
 	/* Disable unique transition scale */
-	val = vlv_dpio_read(dev_priv, pipe, VLV_TX_DW3(ch));
-	val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
-	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(ch), val);
+	for (i = 0; i < 4; i++) {
+		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
+		val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
+		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
+	}
 
 	/* Additional steps for 1200mV-0dB */
 #if 0