From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 2 Mar 2018 11:56:56 +0200
Subject: drm/i915: Kill the remaining CHV HBR2 leftovers
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Git-commit: 3b358cdaf3319521efdf19ff07918bcc4d57013e
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

AFAIK CHV was supposed to have HBR2 originally, but in the end the feature
was dropped. We still have some code leftovers from those early days.
Eliminate them.

The extra bit for the training pattern seems to be dead in the hardware.
I can set it (in fact I can set almost any reserved bit in the
registers) but it doesn't seem to interfere with the operation of the
hardware. Either that or I'm very lucky that my displays complete link
training with the incorrect pattern being sent out.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180302095656.19662-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/i915_reg.h |    2 --
 drivers/gpu/drm/i915/intel_dp.c |   20 ++++----------------
 2 files changed, 4 insertions(+), 18 deletions(-)

--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4943,8 +4943,6 @@ enum {
 #define   DP_LINK_TRAIN_OFF		(3 << 28)
 #define   DP_LINK_TRAIN_MASK		(3 << 28)
 #define   DP_LINK_TRAIN_SHIFT		28
-#define   DP_LINK_TRAIN_PAT_3_CHV	(1 << 14)
-#define   DP_LINK_TRAIN_MASK_CHV	((3 << 28)|(1<<14))
 
 /* CPT Link training mode */
 #define   DP_LINK_TRAIN_PAT_1_CPT	(0 << 8)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -91,8 +91,6 @@ static const struct dp_link_dpll chv_dpl
 		{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
 	{ 270000,	/* m2_int = 27, m2_fraction = 0 */
 		{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
-	{ 540000,	/* m2_int = 27, m2_fraction = 0 */
-		{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
 };
 
 /**
@@ -2880,10 +2878,7 @@ _intel_dp_set_link_train(struct intel_dp
 		}
 
 	} else {
-		if (IS_CHERRYVIEW(dev_priv))
-			*DP &= ~DP_LINK_TRAIN_MASK_CHV;
-		else
-			*DP &= ~DP_LINK_TRAIN_MASK;
+		*DP &= ~DP_LINK_TRAIN_MASK;
 
 		switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
 		case DP_TRAINING_PATTERN_DISABLE:
@@ -2896,12 +2891,8 @@ _intel_dp_set_link_train(struct intel_dp
 			*DP |= DP_LINK_TRAIN_PAT_2;
 			break;
 		case DP_TRAINING_PATTERN_3:
-			if (IS_CHERRYVIEW(dev_priv)) {
-				*DP |= DP_LINK_TRAIN_PAT_3_CHV;
-			} else {
-				DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n");
-				*DP |= DP_LINK_TRAIN_PAT_2;
-			}
+			DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n");
+			*DP |= DP_LINK_TRAIN_PAT_2;
 			break;
 		}
 	}
@@ -3640,10 +3631,7 @@ intel_dp_link_down(struct intel_encoder
 		DP &= ~DP_LINK_TRAIN_MASK_CPT;
 		DP |= DP_LINK_TRAIN_PAT_IDLE_CPT;
 	} else {
-		if (IS_CHERRYVIEW(dev_priv))
-			DP &= ~DP_LINK_TRAIN_MASK_CHV;
-		else
-			DP &= ~DP_LINK_TRAIN_MASK;
+		DP &= ~DP_LINK_TRAIN_MASK;
 		DP |= DP_LINK_TRAIN_PAT_IDLE;
 	}
 	I915_WRITE(intel_dp->output_reg, DP);