提交 f8acf6f4 编写于 作者: B Bjorn Helgaas 提交者: Dave Airlie

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

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: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>
上级 9fe0423e
......@@ -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);
......
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