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Commit 60d8edd4 authored by Alex Deucher's avatar Alex Deucher
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drm: add drm_pcie_get_max_link_width helper (v2) 



Add a helper to get the max link width of the port.
Similar to the helper to get the max link speed.

v2: fix typo in commit message

Reviewed-by: default avatarJammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 16881da6

drivers/gpu/drm/drm_pci.c

+20 −0
Original line number Original line Diff line number Diff line
@@ -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);

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

#else





int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)

int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)

include/drm/drmP.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -1098,6 +1098,7 @@ static inline int drm_pci_set_busid(struct drm_device *dev, 
#define DRM_PCIE_SPEED_80 4

#define DRM_PCIE_SPEED_80 4





extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);

extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);

extern int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw);





/* platform section */

/* platform section */

extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);

extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);