From: Aaro Koskinen <aaro.koskinen@iki.fi>
Date: Mon, 31 Dec 2012 01:34:59 +0000 (+0200)
Subject: drm/nouveau: fix init with agpgart-uninorth
X-Git-Tag: v3.7.3~145
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cfdfb8f24b5bb75866fe4735b565a7a8d49e5c6c;p=karo-tx-linux.git

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 35ac57f0aab6..5f0e7efd71e1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1279,7 +1279,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 		if (drm->agp.stat == ENABLED) {
 			mem->bus.offset = mem->start << PAGE_SHIFT;
 			mem->bus.base = drm->agp.base;
-			mem->bus.is_iomem = true;
+			mem->bus.is_iomem = !dev->agp->cant_use_aperture;
 		}
 #endif
 		break;