[Intel-gfx] [PATCH 12/20] drm/i915: Unset reset pch handshake when PCH is not present in one place

[José Roberto de Souza]

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.

Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c         | 12 ------------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 16 +++++++++++++++-
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 71502512ac1f..49151d79e3b1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5283,18 +5283,6 @@ 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 97178d512852..43d7f9071ff4 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -3265,11 +3265,16 @@ static void icl_mbus_init(struct drm_i915_private *dev_priv)
 	I915_WRITE(MBUS_ABOX_CTL, val);
 }
 
+/* Actually it is hsw+ but until skl it was not required to set it */
 static void skl_pch_reset_handshake(struct drm_i915_private *dev_priv)
 {
 	u32 val = I915_READ(HSW_NDE_RSTWRN_OPT);
 
-	val |= RESET_PCH_HANDSHAKE_ENABLE;
+	if (HAS_PCH_NOP(dev_priv))
+		val &= ~RESET_PCH_HANDSHAKE_ENABLE;
+	else
+		val |= RESET_PCH_HANDSHAKE_ENABLE;
+
 	I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
 }
 
@@ -3773,6 +3778,15 @@ 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)) {
+		if (HAS_PCH_NOP(dev_priv)) {
+			u32 val = I915_READ(GEN7_MSG_CTL);
+
+			val &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
+			I915_WRITE(GEN7_MSG_CTL, val);
+		}
+	} else if (INTEL_GEN(dev_priv) >= 7) {
+		skl_pch_reset_handshake(dev_priv);
 	}
 
 	/* For now, we need the power well to be always enabled. */
-- 
2.18.0