[PATCH v3 2/6] drm/i915: Unset reset pch handshake when PCH is not present in one place

From: "José Roberto de Souza" <jose.souza@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [PATCH v3 2/6] drm/i915: Unset reset pch handshake when PCH is not present in one place
Date: Tue, 18 Sep 2018 11:10:11 -0700	[thread overview]
Message-ID: <20180918181015.11001-2-jose.souza@intel.com> (raw)
In-Reply-To: <20180918181015.11001-1-jose.souza@intel.com>

Right now RESET_PCH_HANDSHAKE_ENABLE is enabled all the times inside
of intel_power_domains_init_hw() and if PCH is NOP it is unsed in
i915_gem_init_hw().
So making skl_pch_reset_handshake() handle both cases and calling
it for the missing gens in intel_power_domains_init_hw().
Ivybridge have a different register and bits but with the same
objective so moving it too.

v2(Rodrigo):
- handling IVYBRIDGE case inside intel_pch_reset_handshake()

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c         | 12 ------------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 24 ++++++++++++++++++------
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a94d5a308c4d..3fe5d4f058ee 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5299,18 +5299,6 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
 		I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev_priv) ?
 			   LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
 
-	if (HAS_PCH_NOP(dev_priv)) {
-		if (IS_IVYBRIDGE(dev_priv)) {
-			u32 temp = I915_READ(GEN7_MSG_CTL);
-			temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
-			I915_WRITE(GEN7_MSG_CTL, temp);
-		} else if (INTEL_GEN(dev_priv) >= 7) {
-			u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT);
-			temp &= ~RESET_PCH_HANDSHAKE_ENABLE;
-			I915_WRITE(HSW_NDE_RSTWRN_OPT, temp);
-		}
-	}
-
 	intel_gt_workarounds_apply(dev_priv);
 
 	i915_gem_init_swizzling(dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 4e050dc3ebde..6b724209264a 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -3242,14 +3242,25 @@ static void icl_mbus_init(struct drm_i915_private *dev_priv)
 static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv,
 				      bool have_pch)
 {
-	u32 val = I915_READ(HSW_NDE_RSTWRN_OPT);
+	i915_reg_t reg;
+	u32 reset_bits, val;
 
-	if (have_pch)
-		val |= RESET_PCH_HANDSHAKE_ENABLE;
+	if (IS_IVYBRIDGE(dev_priv)) {
+		reg = GEN7_MSG_CTL;
+		reset_bits = WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK;
+	} else {
+		reg = HSW_NDE_RSTWRN_OPT;
+		reset_bits = RESET_PCH_HANDSHAKE_ENABLE;
+	}
+
+	val = I915_READ(reg);
+
+	if (have_pch && !HAS_PCH_NOP(dev_priv))
+		val |= reset_bits;
 	else
-		val &= ~RESET_PCH_HANDSHAKE_ENABLE;
+		val &= ~reset_bits;
 
-	I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
+	I915_WRITE(reg, val);
 }
 
 static void skl_display_core_init(struct drm_i915_private *dev_priv,
@@ -3762,7 +3773,8 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
 		mutex_lock(&power_domains->lock);
 		vlv_cmnlane_wa(dev_priv);
 		mutex_unlock(&power_domains->lock);
-	}
+	} else if (IS_IVYBRIDGE(dev_priv) || INTEL_GEN(dev_priv) >= 7)
+		intel_pch_reset_handshake(dev_priv, true);
 
 	/*
 	 * Keep all power wells enabled for any dependent HW access during
-- 
2.19.0

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