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PCI: Add pci_enable_ptm() for drivers to enable PTM on endpoints

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Add an pci_enable_ptm() interface so drivers can enable PTM.

The PCI core enables PTM on PTM Roots and switches automatically, but we
don't enable PTM on endpoints unless a driver requests it.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas
2016-06-13 11:01:51 -05:00
parent 9bb04a0c4e
commit eec097d431
3 changed files with 53 additions and 0 deletions
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include/uapi/linux/pci_regs.h
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@@ -967,6 +967,7 @@
/* Precision Time Measurement */
#define PCI_PTM_CAP 0x04 /* PTM Capability */
#define PCI_PTM_CAP_REQ 0x00000001 /* Requester capable */
#define PCI_PTM_CAP_ROOT 0x00000004 /* Root capable */
#define PCI_PTM_CTRL 0x08 /* PTM Control */
#define PCI_PTM_CTRL_ENABLE 0x00000001 /* PTM enable */