From d509af6c85bb711f6299043cf43001ab1cdffd62 Mon Sep 17 00:00:00 2001
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Date: Tue, 29 Aug 2017 16:22:24 -0700
Subject: [PATCH] drm/i915: decouple gen9 and gen10 dp signal levels.
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Git-commit: d509af6c85bb711f6299043cf43001ab1cdffd62
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900

Let's decouple bxt, glk and cnl dp signal levels
from other DDIs to avoid confusion.

No functional change. Only a reorg to avoid messing
with currently working DP signal levels when
moving voltage swing sequences around to match spec.

V2: ddi_signal_levels is also called from other ddi    platforms, so don't remove IS_GEN9_BC check from    skl_ddi_set_iboos. (Ville).

Cc: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170829232230.23051-2-rodrigo.vivi@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_ddi.c |   27 ++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_dp.c  |   10 ++++------
 drivers/gpu/drm/i915/intel_drv.h |    1 +
 3 files changed, 23 insertions(+), 15 deletions(-)

--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2064,23 +2064,32 @@ static uint32_t intel_ddi_dp_level(struc
 	return translate_signal_level(signal_levels);
 }
 
-uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
+u32 bxt_signal_levels(struct intel_dp *intel_dp)
 {
 	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
 	struct drm_i915_private *dev_priv = to_i915(dport->base.base.dev);
 	struct intel_encoder *encoder = &dport->base;
 	enum port port = dport->port;
+	u32 level = intel_ddi_dp_level(intel_dp);
+
+	if (IS_CANNONLAKE(dev_priv))
+		cnl_ddi_vswing_sequence(encoder, level);
+	else
+		bxt_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
+
+	return 0;
+}
+
+uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dport->base.base.dev);
+	struct intel_encoder *encoder = &dport->base;
 	uint32_t level = intel_ddi_dp_level(intel_dp);
 
 	if (IS_GEN9_BC(dev_priv))
-		skl_ddi_set_iboost(encoder, level);
-	else if (IS_GEN9_LP(dev_priv))
-		bxt_ddi_vswing_sequence(dev_priv, level, port, encoder->type);
-	else if (IS_CANNONLAKE(dev_priv)) {
-		cnl_ddi_vswing_sequence(encoder, level);
-		/* DDI_BUF_CTL bits 27:24 are reserved on CNL */
-		return 0;
-	}
+	    skl_ddi_set_iboost(encoder, level);
+
 	return DDI_BUF_TRANS_SELECT(level);
 }
 
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3506,13 +3506,11 @@ intel_dp_set_signal_levels(struct intel_
 	uint32_t signal_levels, mask = 0;
 	uint8_t train_set = intel_dp->train_set[0];
 
-	if (HAS_DDI(dev_priv)) {
+	if (IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv)) {
+		signal_levels = bxt_signal_levels(intel_dp);
+	} else if (HAS_DDI(dev_priv)) {
 		signal_levels = ddi_signal_levels(intel_dp);
-
-		if (IS_GEN9_LP(dev_priv) || IS_CANNONLAKE(dev_priv))
-			signal_levels = 0;
-		else
-			mask = DDI_BUF_EMP_MASK;
+		mask = DDI_BUF_EMP_MASK;
 	} else if (IS_CHERRYVIEW(dev_priv)) {
 		signal_levels = chv_signal_levels(intel_dp);
 	} else if (IS_VALLEYVIEW(dev_priv)) {
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1270,6 +1270,7 @@ void intel_ddi_clock_get(struct intel_en
 			 struct intel_crtc_state *pipe_config);
 void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
 				    bool state);
+u32 bxt_signal_levels(struct intel_dp *intel_dp);
 uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
 u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);