drm/i915: Don't enable hpd detection logic from irq_postinstall()

No reason that I can see why we should enable the hpd detection logic
already during irq postinstall phase. We don't even do this on all
the platforms. We just need it before we actually enable the hotplug
interrupts in .hpd_irq_setup(), and in fact we already do it there as
well. Let's just eliminate the redundant early setup.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201028213323.5423-15-ville.syrjala@linux.intel.comReviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/i915/i915_irq.c

@@ -3407,8 +3407,8 @@ static void ilk_hpd_irq_setup(struct drm_i915_private *dev_priv)
 	ibx_hpd_irq_setup(dev_priv);
 }
 
-static void __bxt_hpd_detection_setup(struct drm_i915_private *dev_priv,
-				      u32 enabled_irqs)
+static void bxt_hpd_detection_setup(struct drm_i915_private *dev_priv,
+				    u32 enabled_irqs)
 {
 	u32 hotplug;
 
@@ -3439,11 +3439,6 @@ static void __bxt_hpd_detection_setup(struct drm_i915_private *dev_priv,
 	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
 }
 
-static void bxt_hpd_detection_setup(struct drm_i915_private *dev_priv)
-{
-	__bxt_hpd_detection_setup(dev_priv, BXT_DE_PORT_HOTPLUG_MASK);
-}
-
 static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
 {
 	u32 hotplug_irqs, enabled_irqs;
@@ -3453,7 +3448,7 @@ static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
 
 	bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
 
-	__bxt_hpd_detection_setup(dev_priv, enabled_irqs);
+	bxt_hpd_detection_setup(dev_priv, enabled_irqs);
 }
 
 static void ibx_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -3472,12 +3467,6 @@ static void ibx_irq_postinstall(struct drm_i915_private *dev_priv)
 
 	gen3_assert_iir_is_zero(&dev_priv->uncore, SDEIIR);
 	I915_WRITE(SDEIMR, ~mask);
-
-	if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
-	    HAS_PCH_LPT(dev_priv))
-		ibx_hpd_detection_setup(dev_priv);
-	else
-		spt_hpd_detection_setup(dev_priv);
 }
 
 static void ilk_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -3517,8 +3506,6 @@ static void ilk_irq_postinstall(struct drm_i915_private *dev_priv)
 	GEN3_IRQ_INIT(uncore, DE, dev_priv->irq_mask,
 		      display_mask | extra_mask);
 
-	ilk_hpd_detection_setup(dev_priv);
-
 	ibx_irq_postinstall(dev_priv);
 }
 
@@ -3639,12 +3626,6 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 
 		GEN3_IRQ_INIT(uncore, GEN11_DE_HPD_, ~de_hpd_masked,
 			      de_hpd_enables);
-		gen11_tc_hpd_detection_setup(dev_priv);
-		gen11_tbt_hpd_detection_setup(dev_priv);
-	} else if (IS_GEN9_LP(dev_priv)) {
-		bxt_hpd_detection_setup(dev_priv);
-	} else if (IS_BROADWELL(dev_priv)) {
-		ilk_hpd_detection_setup(dev_priv);
 	}
 }
 
@@ -3672,21 +3653,6 @@ static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
 
 	gen3_assert_iir_is_zero(&dev_priv->uncore, SDEIIR);
 	I915_WRITE(SDEIMR, ~mask);
-
-	if (HAS_PCH_DG1(dev_priv))
-		icp_ddi_hpd_detection_setup(dev_priv, DG1_DDI_HPD_ENABLE_MASK);
-	else if (HAS_PCH_TGP(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, TGP_TC_HPD_ENABLE_MASK);
-	} else if (HAS_PCH_JSP(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK);
-	} else if (HAS_PCH_MCC(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, ICP_TC_HPD_ENABLE(HPD_PORT_TC1));
-	} else {
-		icp_ddi_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, ICP_TC_HPD_ENABLE_MASK);
-	}
 }
 
 static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)