[PATCH 204/222] drm/nouveau: fix init with agpgart-uninorth

[Herton Ronaldo Krzesinski]

3.5.7.3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aaro Koskinen <aaro.koskinen@xxxxxx>

commit eda85d6ad490923152544fba0473798b6cc0edf6 upstream.

Check that the AGP aperture can be mapped. This follows a similar change
done for Radeon (commit 365048ff, drm/radeon: AGP memory is only I/O if
the aperture can be mapped by the CPU.).

The patch fixes the following error seen on G5 iMac:

	nouveau E[     DRM] failed to create kernel channel, -12

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58806
Reviewed-by: Michel DÃnzer <michel@xxxxxxxxxxx>
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
[ herton: adjust context ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/nouveau/nouveau_bo.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 7f80ed5..994afd0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1179,7 +1179,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 		if (dev_priv->gart_info.type == NOUVEAU_GART_AGP) {
 			mem->bus.offset = mem->start << PAGE_SHIFT;
 			mem->bus.base = dev_priv->gart_info.aper_base;
-			mem->bus.is_iomem = true;
+			mem->bus.is_iomem = !dev->agp->cant_use_aperture;
 		}
 #endif
 		break;
-- 
1.7.9.5

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