diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index d68328f..0d228f9 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -749,7 +749,7 @@
 	 * problem.  We may need to extend this to include other platforms,
 	 * but so far testing only shows the problem on HSW.
 	 */
-	if (IS_HASWELL(dev) && !position) {
+	if (HAS_DDI(dev) && !position) {
 		int i, temp;
 
 		for (i = 0; i < 100; i++) {
@@ -4236,9 +4236,10 @@
 
 	/* Ignore TV since it's buggy */
 	i915_hotplug_interrupt_update_locked(dev_priv,
-				      (HOTPLUG_INT_EN_MASK
-				       | CRT_HOTPLUG_VOLTAGE_COMPARE_MASK),
-				      hotplug_en);
+					     HOTPLUG_INT_EN_MASK |
+					     CRT_HOTPLUG_VOLTAGE_COMPARE_MASK |
+					     CRT_HOTPLUG_ACTIVATION_PERIOD_64,
+					     hotplug_en);
 }
 
 static irqreturn_t i965_irq_handler(int irq, void *arg)
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index ca9b8f6..96bb238 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -38,7 +38,7 @@
 	.enable_ppgtt = -1,
 	.enable_psr = 0,
 	.preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
-	.disable_power_well = 1,
+	.disable_power_well = -1,
 	.enable_ips = 1,
 	.prefault_disable = 0,
 	.load_detect_test = 0,
@@ -127,7 +127,8 @@
 
 module_param_named_unsafe(disable_power_well, i915.disable_power_well, int, 0600);
 MODULE_PARM_DESC(disable_power_well,
-	"Disable the power well when possible (default: true)");
+	"Disable display power wells when possible "
+	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
 
 module_param_named_unsafe(enable_ips, i915.enable_ips, int, 0600);
 MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 82128b9..6795df5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2389,22 +2389,24 @@
 	 * framebuffer compression.  For simplicity, we always install
 	 * a fence as the cost is not that onerous.
 	 */
-	ret = i915_gem_object_get_fence(obj);
-	if (ret == -EDEADLK) {
-		/*
-		 * -EDEADLK means there are no free fences
-		 * no pending flips.
-		 *
-		 * This is propagated to atomic, but it uses
-		 * -EDEADLK to force a locking recovery, so
-		 * change the returned error to -EBUSY.
-		 */
-		ret = -EBUSY;
-		goto err_unpin;
-	} else if (ret)
-		goto err_unpin;
+	if (view.type == I915_GGTT_VIEW_NORMAL) {
+		ret = i915_gem_object_get_fence(obj);
+		if (ret == -EDEADLK) {
+			/*
+			 * -EDEADLK means there are no free fences
+			 * no pending flips.
+			 *
+			 * This is propagated to atomic, but it uses
+			 * -EDEADLK to force a locking recovery, so
+			 * change the returned error to -EBUSY.
+			 */
+			ret = -EBUSY;
+			goto err_unpin;
+		} else if (ret)
+			goto err_unpin;
 
-	i915_gem_object_pin_fence(obj);
+		i915_gem_object_pin_fence(obj);
+	}
 
 	dev_priv->mm.interruptible = true;
 	intel_runtime_pm_put(dev_priv);
@@ -2430,7 +2432,9 @@
 	ret = intel_fill_fb_ggtt_view(&view, fb, plane_state);
 	WARN_ONCE(ret, "Couldn't get view from plane state!");
 
-	i915_gem_object_unpin_fence(obj);
+	if (view.type == I915_GGTT_VIEW_NORMAL)
+		i915_gem_object_unpin_fence(obj);
+
 	i915_gem_object_unpin_from_display_plane(obj, &view);
 }
 
@@ -14695,6 +14699,9 @@
 
 	/* Dell Chromebook 11 */
 	{ 0x0a06, 0x1028, 0x0a35, quirk_backlight_present },
+
+	/* Dell Chromebook 11 (2015 version) */
+	{ 0x0a16, 0x1028, 0x0a35, quirk_backlight_present },
 };
 
 static void intel_init_quirks(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index b05c6d9..a24df35 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -732,6 +732,20 @@
 
 	intel_panel_actually_set_backlight(connector, 0);
 
+	/*
+	 * Although we don't support or enable CPU PWM with LPT/SPT based
+	 * systems, it may have been enabled prior to loading the
+	 * driver. Disable to avoid warnings on LCPLL disable.
+	 *
+	 * This needs rework if we need to add support for CPU PWM on PCH split
+	 * platforms.
+	 */
+	tmp = I915_READ(BLC_PWM_CPU_CTL2);
+	if (tmp & BLM_PWM_ENABLE) {
+		DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
+		I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
+	}
+
 	tmp = I915_READ(BLC_PWM_PCH_CTL1);
 	I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 }
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9dda3ea..d52a15d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1135,7 +1135,7 @@
 		case DRM_PLANE_TYPE_CURSOR:
 			for (level = 0; level < wm_state->num_levels; level++)
 				wm_state->sr[level].cursor =
-					wm_state->sr[level].cursor;
+					wm_state->wm[level].cursor;
 			break;
 		case DRM_PLANE_TYPE_PRIMARY:
 			for (level = 0; level < wm_state->num_levels; level++)
@@ -2818,7 +2818,12 @@
 	int plane;
 	u32 val;
 
+	memset(ddb, 0, sizeof(*ddb));
+
 	for_each_pipe(dev_priv, pipe) {
+		if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_PIPE(pipe)))
+			continue;
+
 		for_each_plane(dev_priv, pipe, plane) {
 			val = I915_READ(PLANE_BUF_CFG(pipe, plane));
 			skl_ddb_entry_init_from_hw(&ddb->plane[pipe][plane],
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index ec010ee..d89c1d0 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1811,6 +1811,21 @@
 	}
 };
 
+static int
+sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv,
+				   int disable_power_well)
+{
+	if (disable_power_well >= 0)
+		return !!disable_power_well;
+
+	if (IS_SKYLAKE(dev_priv)) {
+		DRM_DEBUG_KMS("Disabling display power well support\n");
+		return 0;
+	}
+
+	return 1;
+}
+
 #define set_power_wells(power_domains, __power_wells) ({		\
 	(power_domains)->power_wells = (__power_wells);			\
 	(power_domains)->power_well_count = ARRAY_SIZE(__power_wells);	\
@@ -1827,6 +1842,9 @@
 {
 	struct i915_power_domains *power_domains = &dev_priv->power_domains;
 
+	i915.disable_power_well = sanitize_disable_power_well_option(dev_priv,
+						     i915.disable_power_well);
+
 	mutex_init(&power_domains->lock);
 
 	/*
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 1663ea5..43cba12 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1531,13 +1531,22 @@
 
 int intel_gpu_reset(struct drm_device *dev)
 {
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	int (*reset)(struct drm_device *);
+	int ret;
 
 	reset = intel_get_gpu_reset(dev);
 	if (reset == NULL)
 		return -ENODEV;
 
-	return reset(dev);
+	/* If the power well sleeps during the reset, the reset
+	 * request may be dropped and never completes (causing -EIO).
+	 */
+	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+	ret = reset(dev);
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+
+	return ret;
 }
 
 bool intel_has_gpu_reset(struct drm_device *dev)