[PATCH] drm/radeon: Add early unregister of firmware fb's

[Daniel Vetter <daniel.vetter@ffwll.ch>]

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Without this, we attempt the handover too late, the firmware fb
might be accessing the chip simultaneously to us re-initializing
various parts of it, which might frighten babies or cause all sort
of nasty psychologic trauma to kitten.

Cc: stable@kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[danvet: add cc: stable, forward ported and compile-fixed for X86]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

This patch is required to get the agp rv270 in my ppc Mac Mini working with
kms.  Also tested on my agp rv570 on amd64, doesn't seem to have ill
effects there.

Please review and apply.

Thanks, Daniel

 drivers/gpu/drm/radeon/radeon_device.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 256d204..3aea1a8 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -584,6 +584,22 @@ static bool radeon_switcheroo_can_switch(struct pci_dev *pdev)
 }
 
 
+static void radeon_kick_out_firmware_fb(struct drm_device *ddev)
+{
+	struct apertures_struct *ap;
+	bool primary = false;
+
+	ap = alloc_apertures(1);
+	ap->ranges[0].base = pci_resource_start(ddev->pdev, 0);
+	ap->ranges[0].size = pci_resource_len(ddev->pdev, 0);
+
+#ifdef CONFIG_X86
+	primary = ddev->pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
+#endif
+	remove_conflicting_framebuffers(ap, "radeondrmfb", primary);
+	kfree(ap);
+}
+
 int radeon_device_init(struct radeon_device *rdev,
 		       struct drm_device *ddev,
 		       struct pci_dev *pdev,
@@ -623,6 +639,9 @@ int radeon_device_init(struct radeon_device *rdev,
 	init_waitqueue_head(&rdev->irq.vblank_queue);
 	init_waitqueue_head(&rdev->irq.idle_queue);
 
+	/* Get rid of things like offb */
+	radeon_kick_out_firmware_fb(ddev);
+
 	/* setup workqueue */
 	rdev->wq = create_workqueue("radeon");
 	if (rdev->wq == NULL)
-- 
1.7.1