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drm/nouveau/bar: only ioremap BAR3 if it exists 

Some chips that use system memory exclusively (e.g. GK20A) do not
expose 2 BAR regions. For them only BAR1 exists, and it should be used
for USERD mapping. Do not map BAR3 if its resource does not exist.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2014-05-02 18:32:34 +09:00 committed by Ben Skeggs
parent 4c0dae5787
commit 53d206bb4a
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/nouveau/core/subdev/bar/base.c
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@ -118,8 +118,10 @@ nouveau_bar_create_(struct nouveau_object *parent,
if (ret)
return ret;
bar->iomem = ioremap(nv_device_resource_start(device, 3),
nv_device_resource_len(device, 3));
if (nv_device_resource_len(device, 3) != 0)
bar->iomem = ioremap(nv_device_resource_start(device, 3),
nv_device_resource_len(device, 3));
return 0;
}