fbmem, drm/nouveau: kick firmware framebuffers as soon as possible

Currently vesafb/efifb/... is kicked when hardware driver is registering
framebuffer. To do it hardware must be fully functional, so there's a short
window between start of initialisation and framebuffer registration when
two drivers touch the hardware. Unfortunately sometimes it breaks nouveau
initialisation.

Fix it by kicking firmware driver(s) before we start touching the hardware.

Reported-by: Didier Spaier <didier.spaier@epsm.fr>
Tested-by: Didier Spaier <didier.spaier@epsm.fr>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 70 insertions, 36 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 5b47b79f45e8..94d8dd27bde8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -624,6 +624,7 @@ struct drm_nouveau_private {
 	} debugfs;
 
 	struct nouveau_fbdev *nfbdev;
+	struct apertures_struct *apertures;
 };
 
 static inline struct drm_nouveau_private *
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 292c7ff95105..2c2199329cc1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -183,7 +183,6 @@ nouveau_fbcon_create(struct nouveau_fbdev *nfbdev,
 	struct drm_mode_fb_cmd mode_cmd;
 	struct pci_dev *pdev = dev->pdev;
 	struct device *device = &pdev->dev;
-	struct apertures_struct *aper;
 	int size, ret;
 
 	mode_cmd.width = sizes->surface_width;
@@ -267,28 +266,12 @@ nouveau_fbcon_create(struct nouveau_fbdev *nfbdev,
 	info->fix.mmio_len = pci_resource_len(pdev, 1);
 
 	/* Set aperture base/size for vesafb takeover */
-	aper = info->apertures = alloc_apertures(3);
+	info->apertures = dev_priv->apertures;
 	if (!info->apertures) {
 		ret = -ENOMEM;
 		goto out_unref;
 	}
 
-	aper->ranges[0].base = pci_resource_start(pdev, 1);
-	aper->ranges[0].size = pci_resource_len(pdev, 1);
-	aper->count = 1;
-
-	if (pci_resource_len(pdev, 2)) {
-		aper->ranges[aper->count].base = pci_resource_start(pdev, 2);
-		aper->ranges[aper->count].size = pci_resource_len(pdev, 2);
-		aper->count++;
-	}
-
-	if (pci_resource_len(pdev, 3)) {
-		aper->ranges[aper->count].base = pci_resource_start(pdev, 3);
-		aper->ranges[aper->count].size = pci_resource_len(pdev, 3);
-		aper->count++;
-	}
-
 	info->pixmap.size = 64*1024;
 	info->pixmap.buf_align = 8;
 	info->pixmap.access_align = 32;
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index 92100a9678ba..75c5c465e08e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -639,6 +639,43 @@ static void nouveau_OF_copy_vbios_to_ramin(struct drm_device *dev)
 #endif
 }
 
+static struct apertures_struct *nouveau_get_apertures(struct drm_device *dev)
+{
+	struct pci_dev *pdev = dev->pdev;
+	struct apertures_struct *aper = alloc_apertures(3);
+	if (!aper)
+		return NULL;
+
+	aper->ranges[0].base = pci_resource_start(pdev, 1);
+	aper->ranges[0].size = pci_resource_len(pdev, 1);
+	aper->count = 1;
+
+	if (pci_resource_len(pdev, 2)) {
+		aper->ranges[aper->count].base = pci_resource_start(pdev, 2);
+		aper->ranges[aper->count].size = pci_resource_len(pdev, 2);
+		aper->count++;
+	}
+
+	if (pci_resource_len(pdev, 3)) {
+		aper->ranges[aper->count].base = pci_resource_start(pdev, 3);
+		aper->ranges[aper->count].size = pci_resource_len(pdev, 3);
+		aper->count++;
+	}
+
+	return aper;
+}
+
+static int nouveau_remove_conflicting_drivers(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	dev_priv->apertures = nouveau_get_apertures(dev);
+	if (!dev_priv->apertures)
+		return -ENOMEM;
+
+	remove_conflicting_framebuffers(dev_priv->apertures, "nouveaufb");
+	return 0;
+}
+
 int nouveau_load(struct drm_device *dev, unsigned long flags)
 {
 	struct drm_nouveau_private *dev_priv;
@@ -726,6 +763,12 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
 	NV_INFO(dev, "Detected an NV%2x generation card (0x%08x)\n",
 		dev_priv->card_type, reg0);
 
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		int ret = nouveau_remove_conflicting_drivers(dev);
+		if (ret)
+			return ret;
+	}
+
 	/* map larger RAMIN aperture on NV40 cards */
 	dev_priv->ramin  = NULL;
 	if (dev_priv->card_type >= NV_40) {
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 03f2dc2470b5..7cfcd716fd5f 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1479,11 +1479,10 @@ static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
 	return false;
 }
 
-static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+static bool fb_do_apertures_overlap(struct apertures_struct *gena,
+				    struct apertures_struct *hwa)
 {
 	int i, j;
-	struct apertures_struct *hwa = hw->apertures;
-	struct apertures_struct *gena = gen->apertures;
 	if (!hwa || !gena)
 		return false;
 
@@ -1501,6 +1500,28 @@ static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
 	return false;
 }
 
+void remove_conflicting_framebuffers(struct apertures_struct *a, const char *name)
+{
+	int i;
+
+	/* check all firmware fbs and kick off if the base addr overlaps */
+	for (i = 0 ; i < FB_MAX; i++) {
+		if (!registered_fb[i])
+			continue;
+
+		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
+			continue;
+
+		if (fb_do_apertures_overlap(registered_fb[i]->apertures, a)) {
+			printk(KERN_ERR "fb: conflicting fb hw usage "
+			       "%s vs %s - removing generic driver\n",
+			       name, registered_fb[i]->fix.id);
+			unregister_framebuffer(registered_fb[i]);
+		}
+	}
+}
+EXPORT_SYMBOL(remove_conflicting_framebuffers);
+
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure
@@ -1524,21 +1545,7 @@ register_framebuffer(struct fb_info *fb_info)
 	if (fb_check_foreignness(fb_info))
 		return -ENOSYS;
 
-	/* check all firmware fbs and kick off if the base addr overlaps */
-	for (i = 0 ; i < FB_MAX; i++) {
-		if (!registered_fb[i])
-			continue;
-
-		if (registered_fb[i]->flags & FBINFO_MISC_FIRMWARE) {
-			if (fb_do_apertures_overlap(registered_fb[i], fb_info)) {
-				printk(KERN_ERR "fb: conflicting fb hw usage "
-				       "%s vs %s - removing generic driver\n",
-				       fb_info->fix.id,
-				       registered_fb[i]->fix.id);
-				unregister_framebuffer(registered_fb[i]);
-			}
-		}
-	}
+	remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id);
 
 	num_registered_fb++;
 	for (i = 0 ; i < FB_MAX; i++)