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    Subject[ 23/49] drm/nouveau: fix init with agpgart-uninorth
    3.2-stable review patch.  If anyone has any objections, please let me know.

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

    From: Aaro Koskinen <aaro.koskinen@iki.fi>

    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 Dänzer <michel@daenzer.net>
    Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    [bwh: Backported to 3.2: adjust context]
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/gpu/drm/nouveau/nouveau_bo.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
    +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
    @@ -940,7 +940,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo
    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;

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