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drm/i915: Only bind to function 0 of the PCI device

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Early chipsets (gen2/3) used function 1 as a placeholder for multi-head.
We used to ignore these since they were not assigned to
PCI_CLASS_DISPLAY_VGA. However with 934f992c7 we attempt to bind to all
Intel PCI_CLASS_DISPLAY devices (and functions) to work in multi-gpu
systems. This fails hard on gen2/3.

Reported-by: Ferenc Wágner <wferi@niif.hu>
Tested-by: Ferenc Wágner <wferi@niif.hu>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=28012
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
This commit is contained in:
Chris Wilson 2011-02-01 19:43:02 +00:00
parent 78c6e170ba
commit 5fe49d86f9
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/i915_drv.c
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@ -568,6 +568,14 @@ int i915_reset(struct drm_device *dev, u8 flags)
static int __devinit
i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
/* Only bind to function 0 of the device. Early generations
* used function 1 as a placeholder for multi-head. This causes
* us confusion instead, especially on the systems where both
* functions have the same PCI-ID!
*/
if (PCI_FUNC(pdev->devfn))
return -ENODEV;
return drm_get_pci_dev(pdev, ent, &driver);
}