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vgaarb: Don't disable resources that are not owned 

If a device does not own a resource then we don't need to disable it.
This resolves the case where an Intel IGD device can be configured to
disable decode of VGA memory but we still need the arbiter to handle
VGA I/O port routing.  When the IGD device is in conflict, only
PCI_COMMAND_IO should be disabled since VGA memory does not require
arbitration on this device.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Alex Williamson 2013-08-15 16:37:53 -06:00 committed by Daniel Vetter
parent 5cfacdedb1
commit f22d776f3e
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/vga/vgaarb.c
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@ -257,9 +257,9 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
if (!conflict->bridge_has_one_vga) {
vga_irq_set_state(conflict, false);
flags |= PCI_VGA_STATE_CHANGE_DECODES;
if (lwants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
if (match & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
pci_bits |= PCI_COMMAND_MEMORY;
if (lwants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
if (match & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
pci_bits |= PCI_COMMAND_IO;
}
@ -267,11 +267,11 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
pci_set_vga_state(conflict->pdev, false, pci_bits, flags);
conflict->owns &= ~lwants;
conflict->owns &= ~match;
/* If he also owned non-legacy, that is no longer the case */
if (lwants & VGA_RSRC_LEGACY_MEM)
if (match & VGA_RSRC_LEGACY_MEM)
conflict->owns &= ~VGA_RSRC_NORMAL_MEM;
if (lwants & VGA_RSRC_LEGACY_IO)
if (match & VGA_RSRC_LEGACY_IO)
conflict->owns &= ~VGA_RSRC_NORMAL_IO;
}