drm/i915: Skip display interruption setup when display is not available

Return ealier in the functions doing interruption setup for GEN8+ also
adding a warning in gen8_de_irq_handler() to let us know that
something else is still missing.
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210408203150.237947-1-jose.souza@intel.com

drivers/gpu/drm/i915/i915_irq.c

@@ -2421,6 +2421,8 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 	u32 iir;
 	enum pipe pipe;
 
+	drm_WARN_ON_ONCE(&dev_priv->drm, !HAS_DISPLAY(dev_priv));
+
 	if (master_ctl & GEN8_DE_MISC_IRQ) {
 		iir = intel_uncore_read(&dev_priv->uncore, GEN8_DE_MISC_IIR);
 		if (iir) {
@@ -3059,14 +3061,13 @@ static void cnp_display_clock_wa(struct drm_i915_private *dev_priv)
 	}
 }
 
-static void gen8_irq_reset(struct drm_i915_private *dev_priv)
+static void gen8_display_irq_reset(struct drm_i915_private *dev_priv)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
 	enum pipe pipe;
 
-	gen8_master_intr_disable(dev_priv->uncore.regs);
-
-	gen8_gt_irq_reset(&dev_priv->gt);
+	if (!HAS_DISPLAY(dev_priv))
+		return;
 
 	intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
 	intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
@@ -3078,6 +3079,16 @@ static void gen8_irq_reset(struct drm_i915_private *dev_priv)
 
 	GEN3_IRQ_RESET(uncore, GEN8_DE_PORT_);
 	GEN3_IRQ_RESET(uncore, GEN8_DE_MISC_);
+}
+
+static void gen8_irq_reset(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+
+	gen8_master_intr_disable(dev_priv->uncore.regs);
+
+	gen8_gt_irq_reset(&dev_priv->gt);
+	gen8_display_irq_reset(dev_priv);
 	GEN3_IRQ_RESET(uncore, GEN8_PCU_);
 
 	if (HAS_PCH_SPLIT(dev_priv))
@@ -3093,6 +3104,9 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
 	u32 trans_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) |
 		BIT(TRANSCODER_C) | BIT(TRANSCODER_D);
 
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
 	intel_uncore_write(uncore, GEN11_DISPLAY_INT_CTL, 0);
 
 	if (DISPLAY_VER(dev_priv) >= 12) {
@@ -3715,6 +3729,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 		BIT(TRANSCODER_C) | BIT(TRANSCODER_D);
 	enum pipe pipe;
 
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
 	if (DISPLAY_VER(dev_priv) <= 10)
 		de_misc_masked |= GEN8_DE_MISC_GSE;
 
@@ -3798,6 +3815,16 @@ static void gen8_irq_postinstall(struct drm_i915_private *dev_priv)
 	gen8_master_intr_enable(dev_priv->uncore.regs);
 }
 
+static void gen11_de_irq_postinstall(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
+	gen8_de_irq_postinstall(dev_priv);
+
+	intel_uncore_write(&dev_priv->uncore, GEN11_DISPLAY_INT_CTL,
+			   GEN11_DISPLAY_IRQ_ENABLE);
+}
 
 static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
 {
@@ -3808,12 +3835,10 @@ static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
 		icp_irq_postinstall(dev_priv);
 
 	gen11_gt_irq_postinstall(&dev_priv->gt);
-	gen8_de_irq_postinstall(dev_priv);
+	gen11_de_irq_postinstall(dev_priv);
 
 	GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
 
-	intel_uncore_write(&dev_priv->uncore, GEN11_DISPLAY_INT_CTL, GEN11_DISPLAY_IRQ_ENABLE);
-
 	if (HAS_MASTER_UNIT_IRQ(dev_priv)) {
 		dg1_master_intr_enable(uncore->regs);
 		intel_uncore_posting_read(&dev_priv->uncore, DG1_MSTR_UNIT_INTR);