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authorChris Wilson <chris@chris-wilson.co.uk>2011-02-01 19:43:02 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2011-02-01 21:53:59 +0000
commit5fe49d86f9d01044abf687a8cd21edef636d58aa (patch)
treec76602d2f959c02b72505568d21b78b9a88af255 /drivers/gpu/drm/i915
parent78c6e170badd22c86a5b50a7eb038a02024b8f03 (diff)
drm/i915: Only bind to function 0 of the PCI device
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
Diffstat (limited to 'drivers/gpu/drm/i915')
-rw-r--r--drivers/gpu/drm/i915/i915_drv.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e517447b088..cfb56d0ff36 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -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);
}