diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-02-01 19:43:02 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-17 14:47:32 -0800 |
| commit | a5caac7e5485057711085b764fb3ad95e071e6e5 (patch) | |
| tree | f1a955dff746b194ef51bad0b4a26d56607eaa63 | |
| parent | 9487d9dcae378886b3d06452b630e211982a079a (diff) | |
drm/i915: Only bind to function 0 of the PCI device
commit 5fe49d86f9d01044abf687a8cd21edef636d58aa upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 8 |
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 f09d1cb3fc3..7792c8f7c6d 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -414,6 +414,14 @@ int i965_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); } |