[Intel-gfx] [PATCH] drm/i915: We don't need display's suspend/resume operations when !HAS_DISPLAY

[Rodrigo Vivi]

Suspend resume is broken if we try to enable/disable dc9 on
cases with disabled displays.

Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 103 ++++++++++++++++++++++----------
 1 file changed, 71 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2c7a4318d13c..90693327065a 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2117,6 +2117,15 @@ get_suspend_mode(struct drm_i915_private *dev_priv, bool hibernate)
 	return I915_DRM_SUSPEND_MEM;
 }
 
+static void intel_display_suspend_late(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
+	if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv))
+		bxt_enable_dc9(dev_priv);
+}
+
 static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -2132,10 +2141,10 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
 	intel_power_domains_suspend(dev_priv,
 				    get_suspend_mode(dev_priv, hibernation));
 
+	intel_display_suspend_late(dev_priv);
+
 	ret = 0;
-	if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv))
-		bxt_enable_dc9(dev_priv);
-	else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 		hsw_enable_pc8(dev_priv);
 	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 		ret = vlv_suspend_complete(dev_priv);
@@ -2265,6 +2274,17 @@ static int i915_drm_resume(struct drm_device *dev)
 	return 0;
 }
 
+static void intel_display_resume_early(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
+	if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv)) {
+		gen9_sanitize_dc_state(dev_priv);
+		bxt_disable_dc9(dev_priv);
+	}
+}
+
 static int i915_drm_resume_early(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -2327,10 +2347,9 @@ static int i915_drm_resume_early(struct drm_device *dev)
 
 	i915_check_and_clear_faults(dev_priv);
 
-	if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv)) {
-		gen9_sanitize_dc_state(dev_priv);
-		bxt_disable_dc9(dev_priv);
-	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+	intel_display_resume_early(dev_priv);
+
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
 		hsw_disable_pc8(dev_priv);
 	}
 
@@ -2868,6 +2887,20 @@ static int vlv_resume_prepare(struct drm_i915_private *dev_priv,
 	return ret;
 }
 
+static void intel_runtime_display_suspend(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
+	if (INTEL_GEN(dev_priv) >= 11) {
+		icl_display_core_uninit(dev_priv);
+		bxt_enable_dc9(dev_priv);
+	} else if (IS_GEN9_LP(dev_priv)) {
+		bxt_display_core_uninit(dev_priv);
+		bxt_enable_dc9(dev_priv);
+	}
+}
+
 static int intel_runtime_suspend(struct device *kdev)
 {
 	struct pci_dev *pdev = to_pci_dev(kdev);
@@ -2897,14 +2930,10 @@ static int intel_runtime_suspend(struct device *kdev)
 
 	intel_uncore_suspend(&dev_priv->uncore);
 
+	intel_runtime_display_suspend(dev_priv);
+
 	ret = 0;
-	if (INTEL_GEN(dev_priv) >= 11) {
-		icl_display_core_uninit(dev_priv);
-		bxt_enable_dc9(dev_priv);
-	} else if (IS_GEN9_LP(dev_priv)) {
-		bxt_display_core_uninit(dev_priv);
-		bxt_enable_dc9(dev_priv);
-	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
 		hsw_enable_pc8(dev_priv);
 	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		ret = vlv_suspend_complete(dev_priv);
@@ -2966,6 +2995,31 @@ static int intel_runtime_suspend(struct device *kdev)
 	return 0;
 }
 
+static void intel_runtime_display_resume(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_DISPLAY(dev_priv))
+		return;
+
+	if (INTEL_GEN(dev_priv) >= 11) {
+		bxt_disable_dc9(dev_priv);
+		icl_display_core_init(dev_priv, true);
+		if (dev_priv->csr.dmc_payload) {
+			if (dev_priv->csr.allowed_dc_mask &
+			    DC_STATE_EN_UPTO_DC6)
+				skl_enable_dc6(dev_priv);
+			else if (dev_priv->csr.allowed_dc_mask &
+				 DC_STATE_EN_UPTO_DC5)
+				gen9_enable_dc5(dev_priv);
+		}
+	} else if (IS_GEN9_LP(dev_priv)) {
+		bxt_disable_dc9(dev_priv);
+		bxt_display_core_init(dev_priv, true);
+		if (dev_priv->csr.dmc_payload &&
+		    (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5))
+			gen9_enable_dc5(dev_priv);
+	}
+}
+
 static int intel_runtime_resume(struct device *kdev)
 {
 	struct pci_dev *pdev = to_pci_dev(kdev);
@@ -2986,24 +3040,9 @@ static int intel_runtime_resume(struct device *kdev)
 	if (intel_uncore_unclaimed_mmio(&dev_priv->uncore))
 		DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");
 
-	if (INTEL_GEN(dev_priv) >= 11) {
-		bxt_disable_dc9(dev_priv);
-		icl_display_core_init(dev_priv, true);
-		if (dev_priv->csr.dmc_payload) {
-			if (dev_priv->csr.allowed_dc_mask &
-			    DC_STATE_EN_UPTO_DC6)
-				skl_enable_dc6(dev_priv);
-			else if (dev_priv->csr.allowed_dc_mask &
-				 DC_STATE_EN_UPTO_DC5)
-				gen9_enable_dc5(dev_priv);
-		}
-	} else if (IS_GEN9_LP(dev_priv)) {
-		bxt_disable_dc9(dev_priv);
-		bxt_display_core_init(dev_priv, true);
-		if (dev_priv->csr.dmc_payload &&
-		    (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5))
-			gen9_enable_dc5(dev_priv);
-	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+	intel_runtime_display_resume(dev_priv);
+
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
 		hsw_disable_pc8(dev_priv);
 	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		ret = vlv_resume_prepare(dev_priv, true);
-- 
2.20.1