Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f8acf6f4 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Dave Airlie
Browse files

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: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 9fe0423e

drivers/gpu/drm/drm_pci.c

+1 −1
Original line number Diff line number Diff line
@@ -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);