releases/4.10.5/drm-i915-gen9-enable-hotplug-detection-early.patch

From 2a57d9cce1c08578097d965468e37f06d71fa495 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Fri, 27 Jan 2017 11:39:18 +0200
Subject: drm/i915/gen9+: Enable hotplug detection early
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From: Imre Deak <imre.deak@intel.com>

commit 2a57d9cce1c08578097d965468e37f06d71fa495 upstream.

For LSPCON resume time initialization we need to sample the
corresponding pin's HPD level, but this is only available when HPD
detection is enabled. Currently we enable detection only when enabling
HPD interrupts which is too late, so bring the enabling of detection
earlier.

This is needed by the next patch.

Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1485509961-9010-2-git-send-email-imre.deak@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(rebased onto v4.10.4 due to missing s/IS_BROXTON/IS_GEN9_LP/ upstream change)
(corrected stable tag)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/i915/i915_irq.c |   69 ++++++++++++++++++++++++++++------------
 1 file changed, 50 insertions(+), 19 deletions(-)

--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3089,19 +3089,16 @@ static void ibx_hpd_irq_setup(struct drm
 	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
 }
 
-static void spt_hpd_irq_setup(struct drm_i915_private *dev_priv)
+static void spt_hpd_detection_setup(struct drm_i915_private *dev_priv)
 {
-	u32 hotplug_irqs, hotplug, enabled_irqs;
-
-	hotplug_irqs = SDE_HOTPLUG_MASK_SPT;
-	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_spt);
-
-	ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
+	u32 hotplug;
 
 	/* Enable digital hotplug on the PCH */
 	hotplug = I915_READ(PCH_PORT_HOTPLUG);
-	hotplug |= PORTD_HOTPLUG_ENABLE | PORTC_HOTPLUG_ENABLE |
-		PORTB_HOTPLUG_ENABLE | PORTA_HOTPLUG_ENABLE;
+	hotplug |= PORTA_HOTPLUG_ENABLE |
+		   PORTB_HOTPLUG_ENABLE |
+		   PORTC_HOTPLUG_ENABLE |
+		   PORTD_HOTPLUG_ENABLE;
 	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
 
 	hotplug = I915_READ(PCH_PORT_HOTPLUG2);
@@ -3109,6 +3106,18 @@ static void spt_hpd_irq_setup(struct drm
 	I915_WRITE(PCH_PORT_HOTPLUG2, hotplug);
 }
 
+static void spt_hpd_irq_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug_irqs, enabled_irqs;
+
+	hotplug_irqs = SDE_HOTPLUG_MASK_SPT;
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_spt);
+
+	ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
+
+	spt_hpd_detection_setup(dev_priv);
+}
+
 static void ilk_hpd_irq_setup(struct drm_i915_private *dev_priv)
 {
 	u32 hotplug_irqs, hotplug, enabled_irqs;
@@ -3143,18 +3152,15 @@ static void ilk_hpd_irq_setup(struct drm
 	ibx_hpd_irq_setup(dev_priv);
 }
 
-static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
+static void __bxt_hpd_detection_setup(struct drm_i915_private *dev_priv,
+				      u32 enabled_irqs)
 {
-	u32 hotplug_irqs, hotplug, enabled_irqs;
-
-	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_bxt);
-	hotplug_irqs = BXT_DE_PORT_HOTPLUG_MASK;
-
-	bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
+	u32 hotplug;
 
 	hotplug = I915_READ(PCH_PORT_HOTPLUG);
-	hotplug |= PORTC_HOTPLUG_ENABLE | PORTB_HOTPLUG_ENABLE |
-		PORTA_HOTPLUG_ENABLE;
+	hotplug |= PORTA_HOTPLUG_ENABLE |
+		   PORTB_HOTPLUG_ENABLE |
+		   PORTC_HOTPLUG_ENABLE;
 
 	DRM_DEBUG_KMS("Invert bit setting: hp_ctl:%x hp_port:%x\n",
 		      hotplug, enabled_irqs);
@@ -3164,7 +3170,6 @@ static void bxt_hpd_irq_setup(struct drm
 	 * For BXT invert bit has to be set based on AOB design
 	 * for HPD detection logic, update it based on VBT fields.
 	 */
-
 	if ((enabled_irqs & BXT_DE_PORT_HP_DDIA) &&
 	    intel_bios_is_port_hpd_inverted(dev_priv, PORT_A))
 		hotplug |= BXT_DDIA_HPD_INVERT;
@@ -3178,6 +3183,23 @@ static void bxt_hpd_irq_setup(struct drm
 	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;
+
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_bxt);
+	hotplug_irqs = BXT_DE_PORT_HOTPLUG_MASK;
+
+	bdw_update_port_irq(dev_priv, hotplug_irqs, enabled_irqs);
+
+	__bxt_hpd_detection_setup(dev_priv, enabled_irqs);
+}
+
 static void ibx_irq_postinstall(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -3193,6 +3215,12 @@ static void ibx_irq_postinstall(struct d
 
 	gen5_assert_iir_is_zero(dev_priv, SDEIIR);
 	I915_WRITE(SDEIMR, ~mask);
+
+	if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
+	    HAS_PCH_LPT(dev_priv))
+		; /* TODO: Enable HPD detection on older PCH platforms too */
+	else
+		spt_hpd_detection_setup(dev_priv);
 }
 
 static void gen5_gt_irq_postinstall(struct drm_device *dev)
@@ -3404,6 +3432,9 @@ static void gen8_de_irq_postinstall(stru
 
 	GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
 	GEN5_IRQ_INIT(GEN8_DE_MISC_, ~de_misc_masked, de_misc_masked);
+
+	if (IS_BROXTON(dev_priv))
+		bxt_hpd_detection_setup(dev_priv);
 }
 
 static int gen8_irq_postinstall(struct drm_device *dev)