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drm/pci: Set all supported speeds in speed cap mask for pre-3.0 devices

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For devices that conform to PCIe r3.0 and have a Link Capabilities 2
register, we test and report every bit in the Supported Link Speeds Vector
field.  For a device that supports both 2.5GT/s and 5.0GT/s, we set both
DRM_PCIE_SPEED_25 and DRM_PCIE_SPEED_50 in the returned mask.

For pre-r3.0 devices, the Link Capabilities 0010b encoding
(PCI_EXP_LNKCAP_SLS_5_0GB) means that both 5.0GT/s and 2.5GT/s are
supported, so set both DRM_PCIE_SPEED_25 and DRM_PCIE_SPEED_50 in this
case as well.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Bjorn Helgaas 2013-01-04 19:10:37 +00:00 committed by Dave Airlie
parent 9fe0423eac
commit f8acf6f4c8
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_pci.c
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@ -507,7 +507,7 @@ int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
*mask |= DRM_PCIE_SPEED_25;
if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
*mask |= DRM_PCIE_SPEED_50;
*mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
}
DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);