From: Vinicius Costa Gomes vinicius.gomes@intel.com
commit 1b5d73fb862414106cf270a1a7300ce8ae77de83 upstream.
Enables PCIe PTM (Precision Time Measurement) support in the igc driver. Notifies the PCI devices that PCIe PTM should be enabled.
PCIe PTM is similar protocol to PTP (Precision Time Protocol) running in the PCIe fabric, it allows devices to report time measurements from their internal clocks and the correlation with the PCIe root clock.
The i225 NIC exposes some registers that expose those time measurements, those registers will be used, in later patches, to implement the PTP_SYS_OFFSET_PRECISE ioctl().
Signed-off-by: Vinicius Costa Gomes vinicius.gomes@intel.com Tested-by: Dvora Fuxbrumer dvorax.fuxbrumer@linux.intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Meng Tang tangmeng@uniontech.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/igc/igc_main.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -9,6 +9,7 @@ #include <linux/udp.h> #include <linux/ip.h> #include <linux/pm_runtime.h> +#include <linux/pci.h> #include <net/pkt_sched.h>
#include <net/ipv6.h> @@ -5041,6 +5042,10 @@ static int igc_probe(struct pci_dev *pde
pci_enable_pcie_error_reporting(pdev);
+ err = pci_enable_ptm(pdev, NULL); + if (err < 0) + dev_info(&pdev->dev, "PCIe PTM not supported by PCIe bus/controller\n"); + pci_set_master(pdev);
err = -ENOMEM;