[PATCH v2 01/10] drm/nouveau/bar: only ioremap BAR3 if it exists

Alexandre Courbot
2014-04-21T06:03:36Z

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>
---
drivers/gpu/drm/nouveau/core/subdev/bar/base.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
index bdf594116f3f..73b1ed20c8d5 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
@@ -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;
}

--
1.9.2