Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

[linux-2.6-block.git] / drivers / gpu / drm / drm_pci.c

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index fcd2a86acd2cd66bf7faf49e21fd330088242e34..a1fff1179a97ae5ec55e5f7489e367619de322f8 100644 (file)
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -410,6 +410,26 @@ int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
 }
 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
 
+int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
+{
+       struct pci_dev *root;
+       u32 lnkcap;
+
+       *mlw = 0;
+       if (!dev->pdev)
+               return -EINVAL;
+
+       root = dev->pdev->bus->self;
+
+       pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
+
+       *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
+
+       DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
+       return 0;
+}
+EXPORT_SYMBOL(drm_pcie_get_max_link_width);
+
 #else
 
 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)