diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 733028b4d45e413e9d1689cd73a5fdec0618a982..1c3a8c5571408a6f0a698a53b58f93f6f471a9a9 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -452,6 +452,59 @@ static void drm_setup_crtcs(struct drm_device *dev)
 	kfree(modes);
 	kfree(enabled);
 }
+
+/**
+ * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
+ * @encoder: encoder to test
+ * @crtc: crtc to test
+ *
+ * Return false if @encoder can't be driven by @crtc, true otherwise.
+ */
+static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
+				struct drm_crtc *crtc)
+{
+	struct drm_device *dev;
+	struct drm_crtc *tmp;
+	int crtc_mask = 1;
+
+	WARN(!crtc, "checking null crtc?");
+
+	dev = crtc->dev;
+
+	list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
+		if (tmp == crtc)
+			break;
+		crtc_mask <<= 1;
+	}
+
+	if (encoder->possible_crtcs & crtc_mask)
+		return true;
+	return false;
+}
+
+/*
+ * Check the CRTC we're going to map each output to vs. its current
+ * CRTC.  If they don't match, we have to disable the output and the CRTC
+ * since the driver will have to re-route things.
+ */
+static void
+drm_crtc_prepare_encoders(struct drm_device *dev)
+{
+	struct drm_encoder_helper_funcs *encoder_funcs;
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+		encoder_funcs = encoder->helper_private;
+		/* Disable unused encoders */
+		if (encoder->crtc == NULL)
+			(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
+		/* Disable encoders whose CRTC is about to change */
+		if (encoder_funcs->get_crtc &&
+		    encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
+			(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
+	}
+}
+
 /**
  * drm_crtc_set_mode - set a mode
  * @crtc: CRTC to program
@@ -547,6 +600,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 		encoder_funcs->prepare(encoder);
 	}
 
+	drm_crtc_prepare_encoders(dev);
+
 	crtc_funcs->prepare(crtc);
 
 	/* Set up the DPLL and any encoders state that needs to adjust or depend
@@ -617,7 +672,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 	struct drm_device *dev;
 	struct drm_crtc **save_crtcs, *new_crtc;
 	struct drm_encoder **save_encoders, *new_encoder;
-	struct drm_framebuffer *old_fb;
+	struct drm_framebuffer *old_fb = NULL;
 	bool save_enabled;
 	bool mode_changed = false;
 	bool fb_changed = false;
@@ -668,9 +723,10 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 	 * and then just flip_or_move it */
 	if (set->crtc->fb != set->fb) {
 		/* If we have no fb then treat it as a full mode set */
-		if (set->crtc->fb == NULL)
+		if (set->crtc->fb == NULL) {
+			DRM_DEBUG("crtc has no fb, full mode set\n");
 			mode_changed = true;
-		else if ((set->fb->bits_per_pixel !=
+		} else if ((set->fb->bits_per_pixel !=
 			 set->crtc->fb->bits_per_pixel) ||
 			 set->fb->depth != set->crtc->fb->depth)
 			fb_changed = true;
@@ -682,7 +738,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 		fb_changed = true;
 
 	if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
-		DRM_DEBUG("modes are different\n");
+		DRM_DEBUG("modes are different, full mode set\n");
 		drm_mode_debug_printmodeline(&set->crtc->mode);
 		drm_mode_debug_printmodeline(set->mode);
 		mode_changed = true;
@@ -708,6 +764,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 		}
 
 		if (new_encoder != connector->encoder) {
+			DRM_DEBUG("encoder changed, full mode switch\n");
 			mode_changed = true;
 			connector->encoder = new_encoder;
 		}
@@ -734,10 +791,20 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 			if (set->connectors[ro] == connector)
 				new_crtc = set->crtc;
 		}
+
+		/* Make sure the new CRTC will work with the encoder */
+		if (new_crtc &&
+		    !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
+			ret = -EINVAL;
+			goto fail_set_mode;
+		}
 		if (new_crtc != connector->encoder->crtc) {
+			DRM_DEBUG("crtc changed, full mode switch\n");
 			mode_changed = true;
 			connector->encoder->crtc = new_crtc;
 		}
+		DRM_DEBUG("setting connector %d crtc to %p\n",
+			  connector->base.id, new_crtc);
 	}
 
 	/* mode_set_base is not a required function */
@@ -781,6 +848,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 
 fail_set_mode:
 	set->crtc->enabled = save_enabled;
+	set->crtc->fb = old_fb;
 	count = 0;
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (!connector->encoder)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5a4d3244758a102ec7cea6ed87342619dd47c85e..a839a28d8ee606763ad213d9dc785bc4dde0dd6c 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -125,7 +125,7 @@ static bool edid_is_valid(struct edid *edid)
 		DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
 		goto bad;
 	}
-	if (edid->revision <= 0 || edid->revision > 3) {
+	if (edid->revision > 3) {
 		DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision);
 		goto bad;
 	}
@@ -320,10 +320,10 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
 	mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo);
 
 	mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo;
-	mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 8) |
+	mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) |
 					      pt->vsync_offset_lo);
 	mode->vsync_end = mode->vsync_start +
-		((pt->vsync_pulse_width_hi << 8) |
+		((pt->vsync_pulse_width_hi << 4) |
 		 pt->vsync_pulse_width_lo);
 	mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo);
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 3795dbc0f50cff99b167fc0659f0d0862c8d57d5..93e677a481f5388f380bc86547297e8f87bddbb0 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -435,6 +435,8 @@ EXPORT_SYMBOL(drm_vblank_get);
  */
 void drm_vblank_put(struct drm_device *dev, int crtc)
 {
+	BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
+
 	/* Last user schedules interrupt disable */
 	if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
 		mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
@@ -460,8 +462,9 @@ void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
 	 * so that interrupts remain enabled in the interim.
 	 */
 	if (!dev->vblank_inmodeset[crtc]) {
-		dev->vblank_inmodeset[crtc] = 1;
-		drm_vblank_get(dev, crtc);
+		dev->vblank_inmodeset[crtc] = 0x1;
+		if (drm_vblank_get(dev, crtc) == 0)
+			dev->vblank_inmodeset[crtc] |= 0x2;
 	}
 }
 EXPORT_SYMBOL(drm_vblank_pre_modeset);
@@ -473,9 +476,12 @@ void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
 	if (dev->vblank_inmodeset[crtc]) {
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
 		dev->vblank_disable_allowed = 1;
-		dev->vblank_inmodeset[crtc] = 0;
 		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
-		drm_vblank_put(dev, crtc);
+
+		if (dev->vblank_inmodeset[crtc] & 0x2)
+			drm_vblank_put(dev, crtc);
+
+		dev->vblank_inmodeset[crtc] = 0;
 	}
 }
 EXPORT_SYMBOL(drm_vblank_post_modeset);
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 2d797ffe8137c43472f08a3019ecb2052d664ec6..cc4649577a61d0c5aae865e8f219f931c44519e5 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -811,7 +811,7 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
 	dev_priv->hws_map.flags = 0;
 	dev_priv->hws_map.mtrr = 0;
 
-	drm_core_ioremap(&dev_priv->hws_map, dev);
+	drm_core_ioremap_wc(&dev_priv->hws_map, dev);
 	if (dev_priv->hws_map.handle == NULL) {
 		i915_dma_cleanup(dev);
 		dev_priv->status_gfx_addr = 0;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 28b726d07a0cf640c16b962f5094f7d8ddc8962c..85685bfd12daf02fb26bea88a90e521d6e3237c2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3548,7 +3548,7 @@ i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 	user_data = (char __user *) (uintptr_t) args->data_ptr;
 	obj_addr = obj_priv->phys_obj->handle->vaddr + args->offset;
 
-	DRM_ERROR("obj_addr %p, %lld\n", obj_addr, args->size);
+	DRM_DEBUG("obj_addr %p, %lld\n", obj_addr, args->size);
 	ret = copy_from_user(obj_addr, user_data, args->size);
 	if (ret)
 		return -EFAULT;
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 65be30dccc7767d8781cad444a317c43930a6064..fc28e2bbd5427e6030869724dfb9bd20b5797451 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -111,6 +111,12 @@ parse_panel_data(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 	panel_fixed_mode->clock = dvo_timing->clock * 10;
 	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
 
+	/* Some VBTs have bogus h/vtotal values */
+	if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
+		panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
+	if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
+		panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
+
 	drm_mode_set_name(panel_fixed_mode);
 
 	dev_priv->vbt_mode = panel_fixed_mode;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 65b635ce28c8c78da6563f21538d9d6434de23a9..a2834276cb38637949648dad2ae2b59de8995fbf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -217,7 +217,7 @@ bool intel_pipe_has_type (struct drm_crtc *crtc, int type)
     return false;
 }
 
-#define INTELPllInvalid(s)   do { DRM_DEBUG(s); return false; } while (0)
+#define INTELPllInvalid(s)   do { /* DRM_DEBUG(s); */ return false; } while (0)
 /**
  * Returns whether the given set of divisors are valid for a given refclk with
  * the given connectors.
diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index 0b0d236c215469120e031af56d5e80a4ca475e5c..c7d4b2e606a5f73f5fbed9217449b16c504b7e4d 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -76,6 +76,7 @@ struct drm_encoder_helper_funcs {
 	void (*mode_set)(struct drm_encoder *encoder,
 			 struct drm_display_mode *mode,
 			 struct drm_display_mode *adjusted_mode);
+	struct drm_crtc *(*get_crtc)(struct drm_encoder *encoder);
 	/* detect for DAC style encoders */
 	enum drm_connector_status (*detect)(struct drm_encoder *encoder,
 					    struct drm_connector *connector);
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index c707c15f5164ef3a9410dbc98d246f34189be804..ff8d27af47869b611067a2bef26c140042bf03d7 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -58,10 +58,10 @@ struct detailed_pixel_timing {
 	u8 hsync_pulse_width_lo;
 	u8 vsync_pulse_width_lo:4;
 	u8 vsync_offset_lo:4;
-	u8 hsync_pulse_width_hi:2;
-	u8 hsync_offset_hi:2;
 	u8 vsync_pulse_width_hi:2;
 	u8 vsync_offset_hi:2;
+	u8 hsync_pulse_width_hi:2;
+	u8 hsync_offset_hi:2;
 	u8 width_mm_lo;
 	u8 height_mm_lo;
 	u8 height_mm_hi:4;