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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-01-20 16:09:12 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2011-01-23 15:52:16 +0300 |
| commit | 934f992c763ae1e5eefcce8af769c16444085df7 (patch) | |
| tree | 782f06fc0cf77813499d3d77e47a23c0f613625e /drivers/gpu/drm/i915/i915_dma.c | |
| parent | 076e2c0eb83f1a0e2e7d0ae1e4d4c0f7b13f1f64 (diff) | |
| download | linux-934f992c763ae1e5eefcce8af769c16444085df7.tar.xz | |
drm/i915: Recognise non-VGA display devices
Starting with SandyBridge (though possible with earlier hacked BIOSes),
the BIOS may initialise the IGFX as secondary to a discrete GPU. Prior,
it would simply disable the integrated GPU. So we adjust our PCI class
mask to match any DISPLAY_CLASS device.
In such a configuration, the IGFX is not a primary VGA controller and
so should not take part in VGA arbitration, and the error return from
vga_client_register() is expected.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/gpu/drm/i915/i915_dma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 665898124200..17bd766f2081 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1215,9 +1215,15 @@ static int i915_load_modeset_init(struct drm_device *dev) if (ret) DRM_INFO("failed to find VBIOS tables\n"); - /* if we have > 1 VGA cards, then disable the radeon VGA resources */ + /* If we have > 1 VGA cards, then we need to arbitrate access + * to the common VGA resources. + * + * If we are a secondary display controller (!PCI_DISPLAY_CLASS_VGA), + * then we do not take part in VGA arbitration and the + * vga_client_register() fails with -ENODEV. + */ ret = vga_client_register(dev->pdev, dev, NULL, i915_vga_set_decode); - if (ret) + if (ret && ret != -ENODEV) goto cleanup_ringbuffer; intel_register_dsm_handler(); |