tree b069d97452c40183a433fa367ce2110ca0acfa01
parent ac2f952c6b4035e66b0fb02b34e0f2225a3df39a
author Aaro Koskinen <aaro.koskinen@iki.fi> 1356917699 +0200
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074812 +0200

drm/nouveau: fix init with agpgart-uninorth

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>
Cc: Weng Meiling <wengmeiling.weng@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>