[Intel-gfx] [PATCH 5/6] drm/i915: Enable HPD interrupts with master ctl interrupt

[Animesh Manna]

While suspending the device hpd related interrupts are enabled
to get the interrupt when device is in suspend state.

Though display is in DC9 but system can be in S0 or S0i3 state.
Hot plug during S0 state will generate de_port_interrupt but if
system is in S0i3 state then display driver will get hotplug
interrupt as pcu_hpd_interrupt which will come via pmc. So
added the interrupt handling for pcu hpd interrupt.

Signed-off-by: Animesh Manna <animesh.manna at intel.com>
Signed-off-by: A.Sunil Kamath <sunil.kamath at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 56 ++++++++++++++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_reg.h | 12 +++++++++
 2 files changed, 65 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index c85eb8d..35d7423 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -110,9 +110,9 @@ static const u32 hpd_status_i915[HPD_NUM_PINS] = {
 
 /* BXT hpd list */
 static const u32 hpd_bxt[HPD_NUM_PINS] = {
-	[HPD_PORT_A] = BXT_DE_PORT_HP_DDIA,
-	[HPD_PORT_B] = BXT_DE_PORT_HP_DDIB,
-	[HPD_PORT_C] = BXT_DE_PORT_HP_DDIC
+	[HPD_PORT_A] = (BXT_DE_PORT_HP_DDIA | BXT_PCU_DC9_HP_DDIA),
+	[HPD_PORT_B] = (BXT_DE_PORT_HP_DDIB | BXT_PCU_DC9_HP_DDIB),
+	[HPD_PORT_C] = (BXT_DE_PORT_HP_DDIC | BXT_PCU_DC9_HP_DDIC)
 };
 
 /* IIR can theoretically queue up two events. Be paranoid. */
@@ -2337,6 +2337,22 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 			DRM_ERROR("The master control interrupt lied (DE PORT)!\n");
 	}
 
+	if (master_ctl & GEN8_PCU_IRQ) {
+		iir = I915_READ(GEN8_PCU_IIR);
+		if (iir) {
+			u32 tmp_mask;
+			I915_WRITE(GEN8_PCU_IIR, iir);
+			ret = IRQ_HANDLED;
+			if (IS_BROXTON(dev)) {
+				tmp_mask = iir & BXT_PCU_DC9_HOTPLUG_MASK;
+				if (tmp_mask)
+					bxt_hpd_irq_handler(dev, tmp_mask, hpd_bxt);
+			} else
+				DRM_ERROR("Unexpected PCU interrupt\n");
+		} else
+			DRM_ERROR("The master control interrupt lied (PCU)!\n");
+	}
+
 	for_each_pipe(dev_priv, pipe) {
 		u32 flip_done, fault_errors;
 
@@ -4681,6 +4697,19 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
 	dev_priv->pm.irqs_enabled = false;
 }
 
+static void bxt_enable_pcu_interrupt(struct drm_i915_private *dev_priv)
+{
+	u32 de_pcu_hpd_enable_mask, de_pcu_imr, de_pcu_ier;
+
+	de_pcu_hpd_enable_mask = GEN9_DE_PCU_PORTA_HOTPLUG |
+				GEN9_DE_PCU_PORTB_HOTPLUG |
+				GEN9_DE_PCU_PORTC_HOTPLUG;
+
+	de_pcu_imr = (I915_READ(GEN8_PCU_IMR) & 0x0);
+	de_pcu_ier = (I915_READ(GEN8_PCU_IER) | de_pcu_hpd_enable_mask);
+	GEN5_IRQ_INIT(GEN8_PCU_, de_pcu_imr, de_pcu_ier);
+}
+
 /**
  * intel_runtime_pm_disable_interrupts - runtime interrupt disabling
  * @dev_priv: i915 device instance
@@ -4690,8 +4719,29 @@ void intel_irq_uninstall(struct drm_i915_private *dev_priv)
  */
 void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv)
 {
+	struct drm_device *dev = dev_priv->dev;
+	unsigned long flags = 0;
+
 	dev_priv->dev->driver->irq_uninstall(dev_priv->dev);
 	dev_priv->pm.irqs_enabled = false;
+
+	if (IS_BROXTON(dev) && dev_priv->vbt.hpd_wakeup_enabled) {
+
+		/* Enable HPD related interrupts during DC9 for HPD wakeup */
+
+		I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
+		POSTING_READ(GEN8_MASTER_IRQ);
+
+		spin_lock_irqsave(&dev_priv->irq_lock, flags);
+		if (dev_priv->display.hpd_irq_setup)
+			dev_priv->display.hpd_irq_setup(dev_priv->dev);
+		spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
+
+		bxt_enable_pcu_interrupt(dev_priv);
+
+		dev_priv->pm.irqs_enabled = true;
+	}
+
 	synchronize_irq(dev_priv->dev->irq);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cc42bd9..15f9021 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5954,6 +5954,18 @@ enum skl_disp_power_wells {
 #define GEN8_PCU_IIR _MMIO(0x444e8)
 #define GEN8_PCU_IER _MMIO(0x444ec)
 
+/* BXT PCU DC9 hotplug control */
+#define BXT_PCU_DC9_HP_DDIA		(1<<31)
+#define BXT_PCU_DC9_HP_DDIB		(1<<30)
+#define BXT_PCU_DC9_HP_DDIC		(1<<29)
+#define BXT_PCU_DC9_HOTPLUG_MASK	(BXT_PCU_DC9_HP_DDIA | \
+					 BXT_PCU_DC9_HP_DDIB | \
+					 BXT_PCU_DC9_HP_DDIC)
+
+#define GEN9_DE_PCU_PORTA_HOTPLUG      (1 << 31)
+#define GEN9_DE_PCU_PORTB_HOTPLUG      (1 << 30)
+#define GEN9_DE_PCU_PORTC_HOTPLUG      (1 << 29)
+
 #define ILK_DISPLAY_CHICKEN2	_MMIO(0x42004)
 /* Required on all Ironlake and Sandybridge according to the B-Spec. */
 #define  ILK_ELPIN_409_SELECT	(1 << 25)
-- 
2.0.2