drm/radeon: AGP memory is only I/O if the aperture can be mapped by the CPU.

Michel Dänzer · airlied · commit 365048ff7f97 · 2010-05-21T15:06:45.000+10:00
Fixes AGP initialization failure with Apple UniNorth bridges due to trying to
ioremap() normal RAM.

Signed-off-by: Michel Dänzer &lt;daenzer@vmware.com&gt;
Signed-off-by: Dave Airlie &lt;airlied@redhat.com&gt;
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -451,7 +451,7 @@ static int radeon_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
 			/* RADEON_IS_AGP is set only if AGP is active */
 			mem->bus.offset = mem->mm_node->start << PAGE_SHIFT;
 			mem->bus.base = rdev->mc.agp_base;
-			mem->bus.is_iomem = true;
+			mem->bus.is_iomem = !rdev->ddev->agp->cant_use_aperture;
 		}
 #endif
 		break;

Original file line number	Diff line number	Diff line change
`@@ -451,7 +451,7 @@ static int radeon_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_`
`451`	`451`	`/* RADEON_IS_AGP is set only if AGP is active */`
`452`	`452`	`mem->bus.offset = mem->mm_node->start << PAGE_SHIFT;`
`453`	`453`	`mem->bus.base = rdev->mc.agp_base;`
`454`		`- mem->bus.is_iomem = true;`
	`454`	`+ mem->bus.is_iomem = !rdev->ddev->agp->cant_use_aperture;`
`455`	`455`	`}`
`456`	`456`	`#endif`
`457`	`457`	`break;`